Icannos/chess_studies huggingface dataset:
[Event "Zurich"]
[Site "?"]
[Date "1934.??.??"]
[Round "?"]
[White "Lasker"]
[Black "Henneberger"]
[Result "1-0"]
[Annotator "25: To make or permit the Exchange"]
[ECO "E21"]
[PlyCount "81"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Black tries to force his opponent into clearing up the central situation } 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Bxc3+ 5. bxc3 d6 6. g3 O-O 7. Bg2 Qe7 8. Ba3 Nbd7 9. Nd2 e5 10. O-O Re8 11. e3 { We have now reached the Wyvill
Formation. The conclusion reached there was that White ought to hold the pawn
formation intact as long as possible, meanwhile building up his attack behind
the lines, a strategy, which is similar to play of the previous exampe. Black
for his part should try to force White to play Pd5 } 11... c5 12. Rb1 Nb6 $2 { This is quite in accordance with the positional requirements outlined
above, for Black will be able to play ... Be6 putting pressure on the White's
c-pawn so as to induce him to advance Pd5. Nevertheless ... Rb8, or ... Pe4
would have been better, simply because White now gets the initiative } 13. dxc5 $1 dxc5 14. Rb5 { Defence of the c-pawn would now require ... Nfd7,
after which Black would have great difficulty in completing his development.
He therefore decides to let the pawn go } 14... Bd7 15. Bxc5 Qe6 16. Rb4 Bc6 17. Bxb6 Bxg2 18. Kxg2 axb6 { Although White is a pawn up the situation
is far from clear, in view of the pawn weakensses in both camps } 19. Qc2 Red8 ( 19... e4 ) 20. f3 Rd6 21. Rf2 Rad8 22. Ne4 Nxe4 23. Qxe4 Qd7 24. Rbb2 ( 24. Qxe5 Re8 25. Qf4 Rf6 26. Qg5 h6 27. Qh4 Rxe3 ) 24... f6 25. c5 bxc5 26. Rxb7 Qe6 27. g4 { Prevents ... Pf5; } 27... Rd3 ( 27... Rd2 28. Ra7 ) 28. c4 g6 29. Rb8 $1 { Exchanging off a pair of Rooks } 29... Kg7 30. Rxd8 Rxd8 31. Rb2 Kh6 32. Kg3 Rd1 33. h4 Rg1+ 34. Kh2 Rd1 35. Kg3 Rg1+ 36. Rg2 f5 37. Qd5 Rxg2+ 38. Kxg2 Qa6 39. Qg8 Qxa2+ 40. Kg3 Qa7 41. Qf8+ 1-0
[Event "Russia"]
[Site "Match, Leningrad/Moscow  (10)"]
[Date "1933.??.??"]
[Round "?"]
[White "Flohr"]
[Black "Botvinnik"]
[Result "0-1"]
[Annotator "25: To make or permit the Exchange"]
[ECO "A95"]
[PlyCount "64"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Exchange at d5 usually achieves nothing against the Stonewall Defense } 1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 Be7 5. Nc3 d5 6. Nf3 c6 7. O-O O-O 8. b3 Qe8 9. Bb2 Nbd7 10. Qd3 Qh5 11. cxd5 { This exchange on d5 often gives some initiative
in such position, for it enables White to start a minority attack on the
Queenside. The present position, however, is an exception which provides us
with a welcome chance of giving a warning against superficial thinking. How is
it that the minority attack give White such a promising initative in many
variations of the QGD? The reason must be that the Pb4-b5 of the minority
attack is a means of breaking the half-open c-file fully open. But this is not
the whole explanation. The essential point is that Black, who has the
half-open e-file, cannot be so prompt with his counterattack. His thematic
advance is ... Pf5-f4, and this need preparation. Preparation however needs
time, and White can use this time to push forward his b-pawn without delay.  
 In light of these considerations the difference between the present diagram
and the normal QG positions, in which the minority attack has legitimate
expectations of success, is clear enough. Black has already played ... Pf5 and
so will probably be able to play ... Pf4 before White can play Pb5 on the
other flank. In short, Black's minority attack gets in first } 11... exd5 12. Nd2 ( 12. Ne1 Ne4 13. f4 { Preventing Black's thematic ... Pf5-f4 } ) 12... Ne4 13. f3 ( 13. f4 Nxd2 14. Qxd2 Nf6 { Black works with gain of tempo - a typical proof he holds the initiative } ) 13... Nxc3 $1 14. Bxc3 f4 $1 { It is evident that Black has taken charge.
Little or nothing will come of White's minority attack } 15. Rfe1 ( 15. Rfd1 { followed by Nf1 and Be1 } 15... -- 16. Nf1 -- 17. Be1 ) 15... Bd6 16. Nf1 Rf7 $1 { Freeing f8 for the Knight, so that he can develop his Queenside pieces
without relaxing the pressure on White's position } 17. e3 { Forcing Black to exchange on e3 or g3. } ( 17. Bd2 Nf8 18. gxf4 Bxf4 19. Bxf4 Rxf4 20. e3 ) 17... fxg3 18. Nxg3 ( 18. hxg3 Qg5 19. Kf2 Nf6 $40 ) 18... Qh4 19. Nf1 Nf6 { In the alter circumstance the Knight naturally
does better to go to f6 rather than f8 } 20. Re2 Bd7 21. Be1 Qg5 22. Bg3 Bxg3 23. Nxg3 ( 23. hxg3 Nh5 24. Kh2 Nxg3 25. Nxg3 Qh4+ ) 23... h5 $1 { The storm toops
advance - a sure sign that the pahse of initiative is giving way to phase of
real attack } 24. f4 Qg4 25. Rf2 ( 25. Rf1 h4 26. Bf3 ) 25... h4 26. Bf3 ( 26. h3 Qe6 ( 26... Qxg3 27. Rf3 $19 ) 27. Nf1 Ne4 ) 26... hxg3 $3 27. Bxg4 gxf2+ 28. Kg2 Nxg4 29. h3 Nf6 30. Kxf2 Ne4+ 31. Kg2 Bxh3+ 32. Kxh3 Nf2+ 0-1
[Event "16"]
[Site "Moscow"]
[Date "1936.??.??"]
[Round "?"]
[White "Capablanca"]
[Black "Botvinnik"]
[Result "1/2-1/2"]
[Annotator "25: To make or permit the Exchange"]
[ECO "A95"]
[PlyCount "92"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Black plays ... Nb6 in an attempt to force White to clarify the central
situation } 1. Nf3 f5 2. g3 Nf6 3. Bg2 e6 4. c4 Be7 5. O-O O-O 6. d4 d5 7. Nc3 c6 8. Qb3 Kh8 9. Ne5 Nbd7 10. Nxd7 Nxd7 11. Rd1 Nb6 $1 { Forcing White to make up his mind about the c-pawn } 12. cxd5 ( 12. c5 Nd7 13. Qa4 e5 ( 13... f4 { initiative with Black } ) ) 12... exd5 13. Na4 Nc4 14. Nc5 b6 $2 { Sharpest but inferior } ( 14... Qb6 { Black seizes the initiative } ) 15. Nd3 Bf6 16. Qc2 $1 Bd7 ( 16... Bxd4 17. Nb4 Qf6 18. Nxc6 $1 Bxb2 19. Bxb2 Nxb2 20. Rxd5 ) 17. e3 Nd6 18. a4 a5 { stop Queenside counterplay } 19. b3 Re8 20. Ba3 Ne4 { In the end the
Knight finds itself on f7, so it might as well have gone there immediately } 21. f3 Ng5 22. Ne5 Rc8 ( 22... Bxe5 23. dxe5 Rxe5 $2 24. f4 { fork } ) 23. Rac1 Kg8 24. Qd3 Nf7 25. f4 Be7 26. Bxe7 Qxe7 27. Rc3 Nxe5 { This exchange was
practically unavoidable, since White threatened to double Rooks. Now White,
with a protected passed pawn and a good Bishop, has decidedly the better of it } 28. dxe5 Qb4 29. Rdc1 Rb8 ( 29... -- 30. e6 { Enticement } 30... Rxe6 31. Bxd5 { Pin } 31... cxd5 32. Rxc8+ ) 30. Qd4 { Although White seems to hold the
advantage at this point he had to b content with a draw } 30... b5 31. Ra1 Ra8 32. axb5 Qxb5 33. Rc5 Qxb3 34. Rxd5 Be6 35. Rd6 c5 36. Qxc5 ( 36. Qd2 $1 ) 36... Rec8 37. Qb6 Rab8 38. Qxb3 ( 38. Qd4 Rc4 39. Qd1 $1 ) 38... Bxb3 39. Bc6 ( 39. e4 ) 39... a4 40. g4 fxg4 41. Kf2 Kf8 42. Kg3 Rb6 43. Be4 Rxd6 44. exd6 Rd8 45. Bxh7 Rxd6 46. Kxg4 Rh6 $11 1/2-1/2
[Event "Moscow"]
[Site "?"]
[Date "1956.??.??"]
[Round "?"]
[White "Boutteville"]
[Black "Kramer"]
[Result "0-1"]
[Annotator "25: To make or permit the Exchange"]
[ECO "E09"]
[PlyCount "76"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

1. c4 Nf6 2. g3 e6 3. Bg2 d5 4. d4 Be7 5. Nf3 O-O 6. O-O c6 7. b3 Nbd7 8. Bb2 b6 9. Nbd2 Bb7 10. Qc2 Rc8 11. e4 Qc7 { After an immediate exchange of
the e-pawn White gains ground, and has the initiative } 12. Rac1 ( 12. e5 { Usually gives nothing } ) 12... dxe4 $1 { Now this exchange is satisfactory } 13. Ne5 { An attempt to sezie the initiative } ( 13. Nxe4 Nxe4 14. Qxe4 c5 { Black plays for the initiative } ) 13... c5 14. Nxd7 Qxd7 15. dxc5 { Thus White hopes for good chances } 15... e3 $1 { This interpolation quite uspets White } ( 15... Bxc5 16. Bxf6 ) ( 15... bxc5 16. Nxe4 Nxe4 17. Bxe4 Bxe4 18. Qxe4 { very slight initiative } ) 16. fxe3 ( 16. Bxb7 exd2 17. Bxc8 dxc1=Q 18. Bxd7 Qxc2 $19 ) 16... Bxg2 17. Kxg2 Ng4 $1 { The second point, which depends on a tactical finesse } 18. Rf3 ( 18. Qc3 Bf6 ) ( 18. Qe4 Qxd2+ ) ( 18. Kf3 Nxh2+ ) 18... Bxc5 19. Qc3 f6 20. b4 Be7 21. Rf4 ( 21. h3 Ne5 22. Rf4 Nd3 ) 21... e5 22. Rf3 ( 22. Rff1 Rfd8 23. Rfd1 Qd3 $1 ) 22... Rfd8 23. Nf1 Qc6 24. c5 b5 25. Qb3+ Kh8 26. h3 Nh6 27. Qc2 Rd7 28. e4 Rcd8 29. Re1 Nf7 $1 30. h4 Nh6 $1 31. Qe2 Ng4 32. Rf5 g6 33. Rf3 h5 34. Bc1 Rd4 35. Nh2 Rxb4 36. Rd3 Rxd3 37. Qxd3 Rd4 38. Qb3 Rxe4 0-1
[Event "Beverwijk"]
[Site "?"]
[Date "1953.??.??"]
[Round "?"]
[White "Cortlever"]
[Black "Trott"]
[Result "1-0"]
[Annotator "25: To make or permit the Exchange"]
[ECO "E09"]
[PlyCount "59"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ White also gets the initiative if Black waits too long with the capture ...
dxe4 } 1. Nf3 Nf6 2. g3 d5 3. Bg2 Nbd7 4. d4 e6 5. O-O Be7 6. b3 O-O 7. Bb2 b6 8. c4 c6 9. Nbd2 Bb7 10. Qc2 Rc8 11. e4 Qc7 12. Rac1 Qb8 13. Rfe1 Rfd8 14. Qb1 { Black has delayed too long the capture on e4 and this allows White to gain
the initiative } 14... Nxe4 15. Nxe4 dxe4 16. Rxe4 c5 17. d5 $1 { Due to the unprotected Be7, White is now able to maintain the central tension } 17... Bf6 $1 { Killing two birds with one stone. The Bishop removes itself
from the line of fire, and at the same time nullifies White's dangerous Queen
Bishop } 18. Rg4 exd5 19. cxd5 h5 $2 ( 19... Bxd5 20. Ng5 Bxg5 21. Rxg5 ) ( 19... Bxb2 20. Qxb2 f6 21. Rd1 Kh8 ) 20. Ng5 $1 { The real point of White's previous moves } 20... hxg4 $2 ( 20... Nf8 21. Bxf6 hxg4 22. Bxd8 Rxd8 23. Qf5 Qc7 ) 21. Qh7+ Kf8 22. Re1 Ne5 23. Bxe5 Bxe5 24. Qh8+ Ke7 25. Qxg7 Rf8 ( 25... -- 26. Qxf7+ Kd6 27. Qe6+ Kc7 28. Qe7+ Rd7 29. Ne6# ) 26. Rxe5+ Kd7 27. Nxf7 Rg8 28. Qf6 Rce8 29. Qf5+ Kc7 30. d6# 1-0
[Event "Yugoslavia-Switzerland"]
[Site "?"]
[Date "1949.??.??"]
[Round "?"]
[White "Pirc"]
[Black "Christoffel"]
[Result "1-0"]
[Annotator "25: To make or permit the Exchange"]
[ECO "D12"]
[PlyCount "79"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Whether or not ot exchange the Knight } 1. c4 Nf6 2. Nf3 c6 3. d4 d5 4. e3 Bf5 5. Nc3 e6 6. Bd3 Bg6 7. Ne5 Nbd7 8. f4 Be7 9. O-O Qc7 10. Qc2 Bxd3 11. Qxd3 Rd8 12. Bd2 O-O 13. Rac1 { White is retaining all options - the best method of
keeping a persistent initiative. He can  1) Being a Queensdie advance by Pb4
followed by eith Pc5 or Pcxd5  2) He can thrust Pe4  3) Bayonet attack by Pg4.
  All these opportunities arise mainly from the influence of the Knight on e5,
and Black's main headache is to decide whether or not to take it off } 13... Nxe5 { He decides to cut the knot } 14. fxe5 dxc4 15. Qxc4 Nd7 $2 ( 15... Nd5 16. e4 ( 16. Ne4 f6 17. exf6 gxf6 ) 16... Nb6 17. Qd3 Qxe5 ) 16. Ne4 c5 { Black wants to prevent Bb4, with exchange of Bishops and subsequent
occupation of d6 with the Knight, but he is jumping out of the frying pan into
the fire } 17. Bb4 $1 { This forces ... Pb6, after which the Black knight cannot get into play via b6 } 17... b6 18. Bc3 Qc6 19. dxc5 $1 Bxc5 ( 19... Nxc5 20. Nf6+ gxf6 21. exf6 Bd6 22. Qg4+ ) 20. Nxc5 Qxc5 ( 20... bxc5 21. b4 Rc8 22. Bd4 Qc7 23. bxc5 Nxe5 24. Qc3 f6 25. Bxe5 $16 ) ( 20... Nxc5 21. Bd4 ( 21. b4 Qe4 $1 ) ) 21. Bd4 $1 { Thus White obtains control of the c-file by force, securing a
great positional advantage } 21... Qc8 22. Qc7 Qa8 23. b4 { With the same idea as Bb4, depriving the Knight of available squares } 23... Qe4 24. Qc6 $1 Qd3 25. Qf3 Qb5 ( 25... Rc8 26. Rxc8 Rxc8 27. Qxf7+ ) 26. Rc7 a6 ( 26... Nxe5 27. Bxe5 Qxe5 28. Rxf7 ) 27. Qc6 Qxc6 { At last Whit
e has his favourable ending. The rest, as they say, is a matter of technique } 28. Rxc6 Rc8 29. Rfc1 Rxc6 30. Rxc6 Rb8 31. Rc7 Rd8 32. Ra7 g6 33. Rxa6 Rc8 34. Ra7 Nf8 35. Bxb6 Rc4 36. Bc5 Kg7 37. a4 g5 38. Rc7 Re4 39. a5 Ng6 40. a6 1-0
[Event "Paris"]
[Site "?"]
[Date "1900.??.??"]
[Round "?"]
[White "Pillsbury"]
[Black "Marco"]
[Result "1-0"]
[Annotator "25: To make or permit the Exchange"]
[ECO "D55"]
[PlyCount "51"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ The problem of the aKnight exchange in the so-called Pillsbury position } 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 b6 7. Bd3 Bb7 8. cxd5 exd5 9. Ne5 Nbd7 10. f4 { About this time Pillsbury was getting some striking
results with this system, characterized by the Knight on e5 with the strong
reinforcing pawn formation d4-e3-f4. The cause of these successes lay int eh
fact that nobody had yet found the right answer to the problem of whether or
not to exchange the Knights } 10... c5 $2 ( 10... Ne8 11. Bxe7 Qxe7 12. O-O Nxe5 13. fxe5 f6 { Black can achieve some strong counterplay (Teichmann) } ) 11. O-O c4 { Trading Knight is still indicated. Black starts a
Queenside attack, but before this has time to become dangerous the White
Kingisde initiative becomes a hurricane } 12. Bc2 a6 13. Qf3 b5 14. Qh3 g6 ( 14... -- 15. Nxd7 Qxd7 16. Bxh7+ { removing the guard } ) 15. f5 $1 { White opens the f-file, and at once the energetic final attack is under way } 15... b4 16. fxg6 hxg6 ( 16... bxc3 17. Bxf6 Nxf6 18. Rxf6 hxg6 19. Bxg6 fxg6 20. Rxg6# ) 17. Qh4 $1 bxc3 18. Nxd7 Qxd7 19. Rxf6 a5 20. Raf1 Ra6 21. Bxg6 $1 { A superb finish } 21... fxg6 22. Rxf8+ Bxf8 23. Rxf8+ Kxf8 24. Qh8+ Kf7 25. Qh7+ Ke8 26. Qg8# 1-0
[Event "Prague"]
[Site "?"]
[Date "1908.??.??"]
[Round "?"]
[White "Teichmann"]
[Black "Dus-Chotimirski"]
[Result "0-1"]
[Annotator "25: To make or permit the Exchange"]
[ECO "D40"]
[PlyCount "60"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

1. d4 d5 2. c4 e6 3. Nc3 c5 4. e3 Nf6 5. Nf3 Nc6 6. a3 a6 7. dxc5 Bxc5 8. b4 Bd6 9. Bb2 dxc4 10. Bxc4 b5 11. Bd3 Bb7 12. O-O { Tarrasch stated that in
symmetrical positions such as this one, the advantage goes to the player who
can get Ne4 (... Ne5 for Black) first. Hence White should have played Ne4 } 12... Ne5 $1 13. Nxe5 ( 13. Be2 O-O $36 ) 13... Bxe5 14. Qe2 O-O 15. Rad1 Qe7 16. f4 { With this and his next move White makes a bid for the initiative
by means of a central pawn advance; but it soon transpires that these are the
very moves which give Black attacking chances } 16... Bc7 ( 16... Bd6 { Not flexible } ) 17. e4 Bb6+ 18. Kh1 Rfd8 19. Bb1 Rac8 20. Rxd8+ Qxd8 ( 20... Rxd8 21. Qc2 Ng4 22. e5 Qh4 $19 ) 21. Rd1 Qe7 22. e5 Nd5 23. Nxd5 Bxd5 24. Qg4 Qb7 { Counterattack is the best means of defence. Black has his own pressure on b2 } 25. f5 Rc4 { tempo! } 26. Qg3 Rf4 { Suddenly White is defenceless against invasion at f2 } 27. f6 g6 28. Ba2 Rf2 29. Bxd5 Qxd5 { back rank tactics } 30. Rc1 Rxb2 0-1
[Event "New York"]
[Site "?"]
[Date "1924.??.??"]
[Round "?"]
[White "Yates"]
[Black "Reti"]
[Result "1-0"]
[Annotator "25: To make or permit the Exchange"]
[ECO "B18"]
[PlyCount "49"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Whether or not to exchange Bishops } 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Nf3 Nd7 7. c3 Ngf6 8. Bc4 e6 9. Qe2 Be7 10. O-O O-O 11. Re1 { flexible } 11... Nd5 12. Bb3 a5 13. a3 Qc7 14. c4 { Logically ousting opponent's pieces from their best squares } 14... Nf4 15. Bxf4 Qxf4 16. Rad1 Bf6 17. Bc2 { The question of whether to trade Bishops here
or leave them exchanged by the opponents is really a matter for the openings
theorist, and in this middlegame book we only consider it in passing. Speaking
very generally one may say that a Bishop exchange is not usually the way to
hold or gain the initiative. } 17... Rfd8 $2 ( 17... Bxc2 18. Qxc2 Qc7 { Black obtains full counterplay (Alekhine) } ) 18. Bxg6 $1 hxg6 19. Ne4 { regrouping } 19... Nb6 20. b3 Be7 21. Rd3 $1 Bxa3 $2 ( 21... Nd7 { for the defence of the Kingside } ) 22. Ne5 $2 ( 22. Nfg5 $1 f5 ( 22... Rd7 23. Rf3 Qg4 24. Qe3 ) 23. Nf6+ gxf6 24. Qxe6+ Kg7 25. Qf7+ Kh6 26. Ne6 ) 22... Qh4 $2 ( 22... Rxd4 23. Rxd4 Qxe5 { Black could have avoided disaster } ) 23. Rh3 Qe7 24. Ng5 $1 { No defence against Qg4-h4 } 24... f6 ( 24... Qxg5 25. Rh8+ Kxh8 26. Nxf7+ Kg8 27. Nxg5 ) 25. Nxg6 $18 1-0
[Event "ct"]
[Site "Amsterdam"]
[Date "1956.??.??"]
[Round "?"]
[White "Petrosian"]
[Black "Pilnick"]
[Result "1-0"]
[Annotator "25: To make or permit the Exchange"]
[ECO "A56"]
[PlyCount "99"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Whether or not to exchange Rooks } 1. d4 Nf6 2. c4 c5 3. d5 e5 4. Nc3 d6 5. e4 g6 6. Nf3 Bg7 7. Bg5 Na6 8. Be2 Nc7 9. Nd2 Bd7 10. a4 b6 11. Nb5 Bxb5 12. cxb5 O-O 13. b4 h6 14. Bxf6 Qxf6 15. O-O Rfd8 16. Nc4 { Natural square of the Knight } 16... Bf8 17. g3 cxb4 18. Qb3 Kg7 19. Rfc1 h5 20. Ne3 Ne8 21. Qxb4 Rdc8 22. Rc6 $1 { Following the principle of play on the
files: play a Rook to the fartherst available square on the open file. It is
practicably impossible for Black to exchange Rooks } 22... Qd8 ( 22... Rxc6 23. bxc6 ( 23. dxc6 ) ) 23. Rac1 Nf6 24. Bf1 { This Bishop, although very much
hampered by its own pawns, espies a chance of great activity outside the pawn
chain } 24... Rcb8 ( 24... Nd7 25. Bh3 ) 25. Bh3 a6 26. Re1 axb5 27. axb5 Nh7 28. Nc4 Ra2 29. Bg2 ( 29. Qb3 { White was under time pressure and was
content for the moment to merely maintain his grip } ) 29... Qf6 30. Rf1 Ng5 31. Qb3 { Black is now bound to lose a pawn } 31... Rba8 32. h4 Nh7 33. Rxb6 Ra1 34. Rc6 R8a2 35. Qe3 Qd8 36. Rxa1 { White could have won more quickly by
leaving Rooks on the board and playing Pb6 } ( 36. b6 ) 36... Rxa1+ 37. Kh2 Nf6 38. f3 Qb8 39. Qb3 Nd7 40. b6 Nc5 41. Qb2 Ra4 42. Qb5 Ra2 43. Rc7 g5 44. Ne3 gxh4 45. Nf5+ Kg8 46. gxh4 Ra6 47. b7 Ra7 48. Rc8 Qxb7 49. Qe8 Nd7 50. Nxd6 1-0
[Event "Brussels"]
[Site "?"]
[Date "1956.??.??"]
[Round "?"]
[White "Landau"]
[Black "Dunkelblum"]
[Result "1-0"]
[Annotator "25: To make or permit the Exchange"]
[ECO "D95"]
[PlyCount "113"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Whether or not the exchange Queens } 1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 g6 5. Nc3 Bg7 6. Qb3 O-O 7. Bd2 e6 8. Bd3 Nbd7 9. O-O Qe7 10. e4 dxe4 11. Nxe4 Nxe4 12. Bxe4 Re8 13. Rad1 Nf6 14. Bc2 Qc7 15. Qe3 b6 { Whereas an exchange of
Bishops often marks the transition from opening to middlegame, the exchange of
Queens often makes the game being to look like an ending. However, there are
positions which even though Queenless can hardly be classed as endgmaes. } 16. Qe5 $1 Qb7 ( 16... Qxe5 17. dxe5 Nd7 18. Bc3 { White controls the open d-file and obtains a decisive positional advantage } ) 17. Bg5 Nd7 18. Qd6 f6 19. Be3 Nf8 20. h4 $1 { Whiteworks up threats on the Kingside } ( 20. -- Bd7 21. -- Rad8 22. -- Bc8 ) 20... Bd7 21. h5 gxh5 ( 21... Rad8 22. hxg6 hxg6 23. Qg3 { White maintains pressure } ) 22. Qh2 Re7 23. Qxh5 Be8 24. Qh3 Bg6 25. Bb3 { White stans to gain noting either by exchanging Bishops at g6 or by letting
Black make the exchange. It is generally good policy to avoid exchanging
pieces whenever one has more terrain than the opponent } 25... Bf7 26. Nd2 e5 27. Nf3 Ng6 ( 27... exd4 28. Nxd4 ) ( 27... e4 28. Nh4 { The Knight on f5 would be very uncomfortable } ) 28. dxe5 Nxe5 29. Nxe5 fxe5 30. Bc2 $1 { The Bishop reverts to its former post because under the new
circumstances a Bishop exchange at g6 would weaken Black still more } 30... e4 ( 30... Bg6 31. Bxg6 hxg6 32. Qg4 Kh7 ( 32... Kf7 33. f4 $1 e4 34. f5 ) 33. Rd6 ) 31. Bg5 Re6 { Somehow or other the Black Rooks must defend the
e-pawn as wel as Rd7 invasions } 32. Rfe1 Rae8 33. c5 h6 ( 33... -- 34. Bb3 Rg6 35. Rd7 ) 34. Bc1 bxc5 35. Bb3 R6e7 36. Bxh6 Bxb3 37. axb3 Bd4 { The Black King is already bereft of pawns, and now the Bishop must also be
situated to block a Rook invasion } 38. Qg4+ Kh7 39. Be3 $1 Qd7 40. Qh5+ { It goes without saying that exchange of Queens it not to be considered at
this stage } 40... Kg8 41. b4 { bullseye } 41... Re5 42. Qg6+ Qg7 43. Qxg7+ Kxg7 { Now Queen exchange is shortest road to victory } 44. Rxd4 $1 cxd4 45. Bxd4 Kg6 46. Bxe5 Rxe5 47. Ra1 Rb5 ( 47... Re7 48. Ra6 Rc7 49. b5 $18 { pin } ) 48. Ra4 { A fine move based on the face that Black's King cannot set
foot on his fifth rank because of Ra5 } 48... Kf6 49. Kf1 Ke6 50. Ke2 Rg5 51. g3 Rb5 52. b3 Kd6 53. Ke3 Rf5 54. Ra2 Rf3+ 55. Kxe4 Rxb3 56. Rd2+ Ke6 57. Rd4 1-0
[Event "Goteburg"]
[Site "?"]
[Date "1952.??.??"]
[Round "?"]
[White "Sundenberg"]
[Black "Kramer"]
[Result "1-0"]
[Annotator "25: To make or permit the Exchange"]
[ECO "A46"]
[PlyCount "73"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Middlegame without Queens } 1. d4 Nf6 2. Nf3 e6 3. Bg5 c5 4. e3 Qb6 5. Qc1 Be7 6. Nbd2 d5 7. c3 Nc6 8. Be2 h6 9. Bh4 Bd7 10. Qc2 Rc8 11. Qb3 Qxb3 $2 { Exchanging in this position is an error } ( 11... c4 12. Qxb6 axb6 13. O-O b5 { seizes the initiative } ) 12. axb3 g5 $2 { needless weakening } ( 12... cxd4 13. exd4 ( 13. Nxd4 Nxd4 14. exd4 a6 ) 13... g5 14. Bg3 Nh5 ) 13. Bg3 cxd4 14. Nxd4 a6 15. b4 O-O 16. h4 { Now White has the initiative on both flanks } 16... Ne4 17. Nxe4 dxe4 18. hxg5 hxg5 19. Nb3 Na7 20. Be5 $1 f6 21. Bd4 Nc6 22. Bc5 f5 23. O-O-O Be8 ( 23... Rcd8 24. Bb6 ) 24. Bxe7 Nxe7 25. Nc5 { the two weaknesses emerge } 25... a5 26. Nxe6 Rf6 27. Nxg5 axb4 28. Rd4 $1 { counterattack as the best means of
defence  Instead of trying to hold his winnings White quite rightly plays for
the attack } 28... b5 29. Bd1 $1 bxc3 30. Bb3+ { Suddenly, like parts of
a well-oiled machine, all the White pieces are working smoothly together
against the Black King } 30... Kg7 31. Ne6+ Kg6 32. Rh3 $1 cxb2+ 33. Kxb2 Nc6 34. Rd6 Ne5 ( 34... Bf7 35. Rg3+ Kh5 36. Rd1 $1 ) 35. Nf8+ Kg7 36. Rh7+ Kxf8 37. Rxf6+ 1-0
[Event "Dubrovnik"]
[Site "?"]
[Date "1950.??.??"]
[Round "?"]
[White "Cortlever"]
[Black "Rabar"]
[Result "1/2-1/2"]
[Annotator "26: Avoidance of Exchanges"]
[ECO "E09"]
[PlyCount "43"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Pushing past with a pawn restricts one's own opportunities } 1. Nf3 Nf6 2. g3 d5 3. Bg2 e6 4. O-O Be7 5. d4 O-O 6. b3 Nbd7 7. Bb2 c6 8. c4 b6 9. Qc2 Bb7 10. Nbd2 Rc8 11. Rac1 Qc7 12. Rfd1 Qb8 13. e4 Rfd8 { This example shows how the game develops when White avoids the exchange } 14. e5 { An obvious and tempting advance. On the one hand White gains some terrain;
on the other hand he limits his own opportunities } 14... Ne8 15. cxd5 { Otherwise Black frees himself by ... Pc5 } 15... cxd5 16. Qd3 Rxc1 { According to the principle that the side with the less available space should
seek simplification } 17. Rxc1 Rc8 18. Nb1 ( 18. Rd1 Qc7 ) 18... Rxc1+ 19. Bxc1 Qc8 20. Qc3 ( 20. Be3 Ba6 { Black also gets plenty of elbow room. It
is now very clear that White has accomplished nothing; he has had to allow the
exchange of all the Rooks, and his space advantage has lost all meaning } ) 20... Qxc3 21. Nxc3 Nc7 22. Nb1 { So as to play 25. Ba3 and force exchange of Black's good Bishop } 1/2-1/2
[Event "15"]
[Site "Moskva Alekhine-mem  (02.11.5"]
[Date "1956.??.??"]
[Round "?"]
[White "Keres"]
[Black "Botvinnik"]
[Result "1-0"]
[Annotator "26: Avoidance of Exchanges"]
[ECO "B63"]
[PlyCount "67"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ White avoids piece exchanges } 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 h6 8. Bxf6 gxf6 9. O-O-O a6 10. f4 h5 11. Kb1 Bd7 12. Be2 Qb6 { White holds an advantage in space; Black has the Bishop pair.
The doubled pawn in the Black set-up could become a liability, but it might
also turn out to be an advantage. In an ending the doubling, although
devaluing the pawns themselves, could enhance the activity of the Bishop pair } 13. Nb3 $1 { By this avoidance of the exchange, White poses Black the
perpetual question of how to get some play for his pieces - a problem which is
particularly troublesome here in view of Black's serious lack of space. } ( 13. Rhf1 Nxd4 14. Qxd4 Qxd4 15. Rxd4 { White retains the initiative at the cost of pieces } ) 13... O-O-O 14. Rhf1 Na5 { Going for simplications. } 15. Rf3 $1 { From here the Rook can operate on either flank } 15... Nxb3 16. axb3 Kb8 17. Na4 $1 { Now it is clear that White has a firm hold on the initiative. He has
no cause to fear exchange of this Knigt, for this would mena Black giving up
his trump card, the Bishop pair. } 17... Qa7 ( 17... Bxa4 18. bxa4 { the b3 squa
re would be available for the Rook, enabling it to join in a powerful attack
on the Black king } ) 18. f5 $1 { The direct attack begins } 18... Be7 19. fxe6 fxe6 20. Rxf6 $1 { A splending combination which nets White a pawn } 20... Rh7 ( 20... b5 21. Rf7 Be8 22. Rg7 bxa4 23. Qb4+ Ka8 24. e5 Bc6 25. exd6 $18 { pinning tactics } ) ( 20... Bxf6 21. Qxd6+ Kc8 22. Nb6+ $18 ) 21. Rg6 b5 22. Nc3 Qc5 23. Na2 Ka7 24. Nb4 Rf8 25. Bf3 h4 26. h3 Bc8 27. Nd3 Qc7 ( 27... Qd4 28. c3 Qb6 29. e5 d5 30. Bxd5 { pinning tactics } ) 28. Nf4 Rf6 29. Bg4 Rxg6 ( 29... Rhf7 30. Nxe6 $1 Bxe6 31. Bxe6 Rxg6 32. Bxf7 { removing the guard } ) 30. Nxg6 Bb7 31. Bxe6 Bd8 32. Bd5 Bxd5 33. Qxd5 Rf7 34. e5 { pinning tactics } 1-0
[Event "New Orleans-Wch"]
[Site "New Orleans-Wch"]
[Date "1927.??.??"]
[Round "?"]
[White "Vidmar"]
[Black "Nimzowitsch"]
[Result "0-1"]
[Annotator "26: Avoidance of Exchanges"]
[ECO "E11"]
[PlyCount "58"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Black leaves the open d-file to his opponent in order to avoid exchanges } 1. d4 Nf6 2. Nf3 e6 3. c4 Bb4+ 4. Bd2 Qe7 5. Nc3 O-O 6. e3 d6 7. Be2 b6 8. O-O Bb7 9. Qc2 Nbd7 10. Rad1 Bxc3 11. Bxc3 Ne4 12. Be1 f5 13. Qb3 c5 14. Nd2 Nxd2 15. Rxd2 e5 16. dxe5 dxe5 17. f3 { With the intention of meeting ... Nf6 with Bh4
followed by doubling of Rooks on the d-file } 17... g5 $1 { A brave and unprejudiced attack pattern } 18. Bf2 Nf6 19. Rfd1 { It is certainl
y no exaggeration to say that nine out of ten players in Black's shoes would
now have played to exchange the Rooks on the open d-file } 19... Rae8 $1 { Nimzowitsch, who so often "went his own way", avoids exchanges in theinterests 
of forming of Kingside attack; the basis for this is his Kingside space
control and the excellent scope of the QueenBishop on the longdiagonal } 20. Qa4 ( 20. Bg3 { Alekhine } ) 20... Ba8 $1 { Protecting the a-pawn and parrying the threat 21. Rd7 } 21. Rd6 Qg7 $1 { Black must operate with some circumspection. } ( 21... e4 22. f4 gxf4 23. Bh4 f3 24. Bxf6 $132 Rxf6 25. Rxf6 fxe2 ) 22. Bf1 $2 ( 22. Be1 e4 ( 22... g4 23. fxg4 Nxg4 24. Bxg4 Qxg4 ) 23. Bc3 ) 22... e4 $1 23. Be1 ( 23. fxe4 Nxe4 24. Rd7 Qxb2 ) ( 23. Be2 exf3 24. gxf3 g4 25. f4 Qb7 { Black gets a destructive attack along the diagonal } ) 23... exf3 24. Bc3 Qe7 $1 { Prettily refuting White's last few moves } 25. R6d3 ( 25. Bxf6 Qxe3+ 26. Kh1 fxg2+ 27. Bxg2 Qe1+ 28. Rxe1 Rxe1# { pinning/back rank tactics } ) 25... fxg2 26. Bxg2 Bxg2 27. Bxf6 Qe4 $1 28. R1d2 Bh3 29. Bc3 Qg4+ 0-1
[Event "Portsmouth/Southsea (06)"]
[Site "Portsmouth/Southsea (06)"]
[Date "1923.??.??"]
[Round "?"]
[White "Alekhine"]
[Black "West"]
[Result "1-0"]
[Annotator "26: Avoidance of Exchanges"]
[ECO "D66"]
[PlyCount "59"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Avoidance of Knight exchange enables White to keep the initiative } 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 Nbd7 6. e3 O-O 7. Rc1 c6 8. Bd3 Re8 9. O-O dxc4 10. Bxc4 Nd5 11. Ne4 { avoiding exchanges except for more pieces on the Kingside } 11... Bxg5 12. Nfxg5 N7f6 13. Ng3 $1 { White avoids a Knight exchange in order to confront his
opponent with maximum difficulty in his development } 13... h6 14. Nf3 Nb6 15. Bb3 Nbd7 { Black aims for the freeing advance ... Pe5 } 16. e4 e5 17. dxe5 Ng4 18. e6 $1 { Thus White ensures himself a definite advantage. The Black
pawn on e6 will not only be weak, but also an obstacle } 18... fxe6 19. Nd4 Nde5 20. h3 Nf6 21. f4 Nf7 22. Kh1 { With Black unable to undertake
anything of importance, White prepares a Kingside attack at his leisure } ( 22. e5 ) 22... a5 23. Rc3 Qb6 24. e5 Nd5 25. Nh5 Re7 ( 25... Nxc3 26. Qg4 g5 27. Nf6+ Kf8 28. bxc3 ) 26. Rg3 Nh8 27. Qd3 Qc7 28. Bxd5 ( 28. Bd1 Nb4 29. Qh7+ Kxh7 30. Rxg7+ Rxg7 31. Nf6+ Kg6 32. Bh5# { "My Best Games of Chess 1908-23 Alekhine". But ... Nb4 is not forced } ) 28... exd5 29. Nf6+ Kf8 ( 29... Kf7 30. Rxg7+ Kxg7 31. Qh7+ Kf8 32. Qg8# ) 30. Qh7 1-0
[Event "Karlsbad"]
[Site "Karlsbad"]
[Date "1929.??.??"]
[Round "21"]
[White "Capablanca"]
[Black "Maroczy"]
[Result "1-0"]
[Annotator "26: Avoidance of Exchanges"]
[ECO "D64"]
[PlyCount "67"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Avoidance of Bishop exchange } 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Bg5 Be7 5. e3 O-O 6. Nc3 Nbd7 7. Rc1 c6 8. Qc2 h6 9. Bh4 a6 10. cxd5 Nxd5 11. Bg3 $1 { Since the position is cramped, White avoids exchanging; this will give the
best chance to maintain pressure } 11... Qa5 12. Nd2 Nxc3 13. bxc3 c5 ( 13... b5 ) 14. Nc4 Qd8 15. Rd1 cxd4 ( 15... b5 16. dxc5 Bxc5 17. Nd6 $36 ) 16. Rxd4 Bc5 ( 16... b5 17. Nd6 Bf6 18. Rd2 Qa5 $1 19. Nxc8 Raxc8 20. Rxd7 Rxc3 21. Qd2 Rxe3+ { possibility based on White's still uncastled King } ) 17. Rd2 Qe7 18. Be2 b6 ( 18... b5 19. Na5 { Black must be content with more modest development } ) 19. Nd6 Nf6 20. O-O ( 20. Bf3 Ra7 21. O-O { Prins } ) 20... Ra7 ( 20... Nd5 $1 21. Ne4 Bb7 $1 ) 21. Bf3 Bd7 ( 21... Rd8 22. Rfd1 Rad7 ( 22... Bxd6 23. Bxd6 { two Bishops } ) 23. Nxc8 Rxc8 24. Rxd7 Nxd7 25. Bb7 ) 22. Rfd1 e5 23. Bh4 { To provoke the following weakness } 23... g5 ( 23... Qe6 24. Be2 ) ( 23... Rc7 24. Nf5 ) 24. Bg3 Kg7 25. Be2 b5 26. h4 Rc7 { Black's defenses cave in } ( 26... Bxd6 27. Rxd6 Rc8 ) 27. hxg5 hxg5 28. Nf5+ Bxf5 29. Qxf5 { Losing a pawn and exposed to a withering attack } 29... Re8 30. Qxg5+ Kh8 31. Qh6+ Nh7 32. Bd3 f6 33. Bxh7 Qxh7 34. Qxf6+ 1-0
[Event "Amsterdam"]
[Site "?"]
[Date "1942.??.??"]
[Round "?"]
[White "Euwe"]
[Black "Van den Hoek"]
[Result "0-1"]
[Annotator "26: Avoidance of Exchanges"]
[ECO "E33"]
[PlyCount "56"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Black cunningly preserves his Bishop from Exchange } 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 Nc6 5. e3 e5 6. d5 Ne7 7. Bd3 O-O 8. Ne2 a5 9. O-O d6 10. a3 Bc5 $1 { Quite correct. White's main strategy is based on playing for Pf4. } ( 10... Bxc3 11. Nxc3 ) 11. Na4 Ba7 12. b4 axb4 13. axb4 b5 14. Nac3 bxc4 15. Bxc4 Bf5 $1 { Provoking Whiteinto the following advance which gives maximum scope to Ba7 } 16. e4 $2 { White falls in with his opponent's plan } ( 16. Bd3 ) 16... Bg6 17. Bg5 Ng4 18. Ba6 f5 $1 { The attack on f2 reaches its climax } 19. Bh4 fxe4 20. Nxe4 Qd7 21. Bb7 ( 21. h3 Nf5 22. hxg4 Nxh4 $19 ) 21... Bxf2+ 22. Bxf2 Rxa1 23. Rxa1 Nxf2 24. N2g3 Nxe4 25. Nxe4 Qg4 26. Re1 Rf4 27. h3 Rxe4 28. Rc1 Re2 $1 0-1
[Event "Nice"]
[Site "?"]
[Date "1930.??.??"]
[Round "?"]
[White "Colle"]
[Black "O'Hanlon"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[ECO "D05"]
[PlyCount "39"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ A. EXPLOSION ON H7 } 1. d4 d5 2. Nf3 Nf6 3. e3 c5 4. c3 e6 5. Bd3 Bd6 6. Nbd2 Nbd7 7. O-O O-O 8. Re1 Re8 9. e4 dxe4 10. Nxe4 Nxe4 11. Bxe4 cxd4 12. Bxh7+ { The full consequences of this sacrifice are difficult to assess in this
position } 12... Kxh7 13. Ng5+ Kg6 ( 13... Kg8 14. Qh5 { White should obtain no more than a draw } 14... Nf6 $2 ( 14... Ne5 15. Rxe5 ( 15. Qh7+ Kf8 16. Ne4 Ng6 17. Nxd6 Qxd6 18. h4 Ke7 19. h5 Rh8 20. Bg5+ Ke8 ( 20... Kf8 21. hxg6 Rxh7 22. gxh7 $18 ) 21. Qxg7 Rxh5 22. Qf6 Qe7 $19 ) 15... Bxe5 16. Qxf7+ Kh8 17. Qh5+ { White must take a perpetual check } ) ( 14... Qf6 15. Qh7+ Kf8 16. Ne4 Qe5 17. cxd4 Qd5 $2 ( 17... Qxd4 18. Qh8+ Ke7 19. Bg5+ Nf6 20. Qxg7 $16 ) ( 17... Qxh2+ 18. Qxh2 Bxh2+ 19. Kxh2 $11 ) 18. Qh8+ Ke7 19. Qxg7 { White's attack continues violently } ) 15. Qxf7+ Kh8 16. Re4 Nxe4 ( 16... Bxh2+ 17. Kxh2 Nxe4 18. Qh5+ Kg8 19. Qh7+ Kf8 20. Qh8+ Ke7 21. Qxg7+ Kd6 22. Nf7+ { winning the Queen. The Black K takes the place of the Bishop } ) 17. Qh5+ Kg8 18. Qh7+ Kf8 19. Qh8+ Ke7 20. Qxg7# ) 14. h4 $1 Rh8 ( 14... -- 15. h5+ Kf6 16. Qf3+ ) ( 14... f5 15. h5+ Kf6 16. Qxd4+ Be5 17. Qh4 g6 18. f4 { White's attack slices through Black's position like a knife through butter } ) 15. Rxe6+ $3 { This is based on removing the guard "... Pf5" and threats of
Knight forks on f7. If ef then ... Pf5 can't block Qd3+ } 15... Nf6 ( 15... fxe6 16. Qd3+ Kf6 17. Qf3+ Kg6 18. Qf7+ Kh6 19. Nxe6+ $18 ) 16. h5+ $1 Kh6 ( 16... Rxh5 17. Qd3+ Kh6 18. Qh7# { based on pins on the Knight } ) 17. Rxd6 Qa5 18. Nxf7+ Kh7 19. Ng5+ Kg8 20. Qb3+ 1-0
[Event "Larache"]
[Site "?"]
[Date "1943.??.??"]
[Round "?"]
[White "Bueno"]
[Black "Subiza"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[ECO "C11"]
[PlyCount "27"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. Nf3 b6 6. Bd3 Be7 7. Be3 O-O 8. h4 { White now threatens the Bishop sacrifice in its most effective form } 8... f6 $2 { This is primarily to keep White's pieces off g5 while pressuring the White
e-pawn; also Black hopes to eventually open the f-file. } ( 8... -- 9. Bxh7+ Kxh7 10. Ng5+ Kg8 ( 10... Bxg5 11. hxg5+ Kg8 12. Qh5 f5 13. g6 $18 ) ( 10... Kh6 11. Nxe6+ ) 11. Qh5 $18 ) ( 8... g6 9. h5 ) ( 8... f5 { closing the diagonal } 9. exf6 Nxf6 ) 9. Bxh7+ Kxh7 ( 9... Kh8 10. Ng5 Qe8 11. h5 $1 fxg5 12. Bg6 Qd8 13. h6 c5 14. Qh5 Nf6 15. hxg7+ Kxg7 16. Qh6+ Kg8 17. Qh8# { Tactics based on the power of the h-file } ) 10. Ng5+ $1 fxg5 ( 10... Kg6 11. h5+ ) ( 10... Kg8 11. Qh5 fxg5 12. hxg5 Rf5 13. Qh7+ Kf8 14. g6 Ke8 15. Qxg7 $18 ) 11. hxg5+ Kg8 ( 11... Kg6 12. Qh5+ Kf5 13. g4# ) 12. Rh8+ { Thematic pattern. The Pg6 wedge with tempo } 12... Kxh8 13. Qh5+ Kg8 14. g6 { Mate can not be averted } 1-0
[Event "Zurich"]
[Site "?"]
[Date "1952.??.??"]
[Round "?"]
[White "Christoffel"]
[Black "Canal"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[FEN "2b2rk1/r1q2p1p/p1n3p1/3R2N1/1p2Q3/1B6/PP3PPP/4R1K1 w - - 0 1"]
[PlyCount "13"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ An example of a Knight sacrifice at h7 } 1. Nxh7 Kxh7 2. Rh5+ Kg7 3. Qh4 $3 { The magnificent point of White's combination } 3... gxh5 4. Qg5+ Kh7 5. Qxh5+ Kg7 6. Qg5+ Kh7 7. Re4 1-0
[Event "Carlsbad"]
[Site "?"]
[Date "1929.??.??"]
[Round "?"]
[White "Spielmann"]
[Black "Grunfeld"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[FEN "r4rk1/1q2nppp/p1b1p3/1p5P/3BP3/1BP1Q1P1/P4P2/R2R2K1 w - - 0 1"]
[PlyCount "7"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ The Bishop sacrifice at g7 in its purist form } 1. Bxg7 Kxg7 2. Qg5+ Ng6 ( 2... Kh8 3. Qf6+ Kg8 4. h6 ) 3. h6+ Kg8 4. Qf6 { h6 pawn wedge } 1-0
[Event "match-tournament"]
[Site "Ch World , Hague/Moscow (Neth"]
[Date "1948.??.??"]
[Round "?"]
[White "Botvinnik"]
[Black "Keres"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[FEN "rq4k1/pp1nrppp/4bn2/6R1/3QP3/P4PN1/4B1PP/2B2RK1 w - - 0 21"]
[PlyCount "5"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ A slightly more complicated Rook sacrifice at g7 } 21. Rxg7+ Kxg7 22. Nh5+ Kg6 ( 22... Kg8 23. Nxf6+ Nxf6 24. Qxf6 -- 25. Bh6 ) 23. Qe3 { The devastating final point
Weak dark square tactic } 1-0
[Event "01"]
[Site "Radio"]
[Date "1946.??.??"]
[Round "?"]
[White "Smyslov"]
[Black "Konig"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[FEN "5nk1/r1qr1pp1/p5b1/2b1pNB1/PpB1P1Q1/6N1/1Pn2P2/1R3RK1 w - - 0 31"]
[PlyCount "13"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ An intricate Knight sacrifice at g7 } 31. Nxg7 $3 { The question of whether
or not Black can accept this offer is not easily answered } 31... Bxf2+ ( 31... Kxg7 32. Nf5+ Kg8 ( 32... Bxf5 33. exf5 Rd4 34. f6+ $1 Kh7 35. Bf4 Ne6 36. Qh5+ Kg8 37. Kh2 ) 33. Bf6 Rd6 34. Nh6+ Kh7 35. Qh4 Rxf6 36. Nxf7+ ( 36. Ng4+ Kg8 37. Nxf6+ Kg7 38. Ne8+ ) 36... Kg7 37. Qh8# ) 32. Rxf2 Qxc4 33. Ne8 Nh7 34. Nf6+ Kg7 { Now there is another explosion, this time on h6 } ( 34... Nxf6 35. Bxf6 Rd6 36. Qh4 Rxf6 { retaining some chances } ) 35. Bh6+ Kh8 ( 35... Kxh6 36. Nf5+ Bxf5 37. Rh2# ) 36. Nxd7 Qd4 37. Nxe5 1-0
[Event "Tarnopol"]
[Site "Tarnopol"]
[Date "1916.??.??"]
[Round "?"]
[White "Alekhine"]
[Black "Feldt"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[ECO "C11"]
[PlyCount "35"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Blindfold game } 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. exd5 Nxd5 5. Ne4 f5 6. Ng5 Be7 7. N5f3 c6 8. Ne5 O-O 9. Ngf3 b6 10. Bd3 Bb7 11. O-O Re8 12. c4 Nf6 13. Bf4 Nbd7 14. Qe2 c5 15. Nf7 $3 Kxf7 16. Qxe6+ $3 Kg6 ( 16... Kxe6 17. Ng5# { piquant } ) 17. g4 { controlling h5 } 17... Be4 18. Nh4# 1-0
[Event "Leuwarden"]
[Site "?"]
[Date "1954.??.??"]
[Round "?"]
[White "Kramer"]
[Black "Ploegh"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[FEN "rn1qr1k1/1b2bppp/pp2pn2/4N1B1/2BP4/2N5/PP2QPPP/3R1RK1 w - - 0 1"]
[PlyCount "11"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ A King hunt } 1. Nxf7 Kxf7 2. Qxe6+ Kg6 3. Bd3+ Kxg5 4. Qe3+ Kg4 5. Qh3+ Kg5 6. f4# 1-0
[Event "Whitby"]
[Site "?"]
[Date "1957.??.??"]
[Round "?"]
[White "Donner"]
[Black "Hempson"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[FEN "4k2r/ppq1bppp/2b1pn2/4N3/2BB4/2P5/PP2QPPP/R5K1 w - - 0 1"]
[PlyCount "15"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ Flight back to the back rank is usually no better } 1. Nxf7 Kxf7 2. Qxe6+ Ke8 ( 2... Kg6 3. Bd3+ Kh6 4. Re1 Re8 5. Re3 ) 3. Rd1 Rf8 ( 3... -- 4. Qf7+ Kd7 5. Be5+ ) 4. Be5 Qb6 5. Qc8+ Bd8 6. Bd6 Rf7 7. Qe6+ Re7 8. Bxe7 1-0
[Event "Leningrad"]
[Site "?"]
[Date "1957.??.??"]
[Round "?"]
[White "Gligoric"]
[Black "Tolush"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[FEN "4rk2/1p3p2/p1b1p1p1/4P1Q1/3r1R2/3B4/Pq3PP1/3R2K1 w - - 0 1"]
[PlyCount "15"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ A Rook Explosion on f7 } 1. Rxf7+ { Although this position differs
considerably from the foregoing ones the decision is still brought about by a
destructive sacrifce at f7 } 1... Kxf7 2. Bxg6+ Kg8 ( 2... Kf8 3. Qf6+ Kg8 4. Qf7+ Kh8 5. Qh7# ) 3. Bh5+ Kh7 4. Qg6+ Kh8 5. Qf6+ Kg8 ( 5... Kh7 6. Bg6+ Kh6 7. Bf7+ Kh7 8. Qg6+ Kh8 9. Qh6# ) 6. Bf7+ Kh7 7. Qg6+ Kh8 8. Qh6# 1-0
[Event "Carsbad"]
[Site "?"]
[Date "1911.??.??"]
[Round "?"]
[White "Teichmann"]
[Black "Schlechter"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[FEN "r3r1k1/1bq1nppp/p1np4/1ppBpN2/4P3/2PP1N2/PP3PPP/R2QR1K1 w - - 0 2"]
[PlyCount "17"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

2. Bxf7+ Kxf7 3. Ng5+ Kg8 ( 3... Kg6 4. Qg4 h5 5. Nxe7+ Qxe7 ( 5... Rxe7 6. Qf5+ Kh6 7. Qh7+ Kxg5 8. h4+ Kxh4 9. Qg6 -- 10. Qg3# ) ( 5... Nxe7 6. Qe6+ Kxg5 7. h4+ Kxh4 8. Re3 Bc8 9. Rh3+ Kg5 10. Rg3+ Kh4 11. Kh2 $1 Bxe6 12. Rxg7 -- 13. g3# ) 6. Qf5+ Kh6 7. Nf7+ ) 4. Qh5 Nxf5 5. Qxh7+ Kf8 6. Qxf5+ Kg8 7. Qg6 $3 { This superb quiet move is the key to the combination. This sort of move is
extremely difficult to foresee } 7... Qd7 8. Re3 -- 9. Qh7+ Kf8 10. Rf3+ 1-0
[Event "Goteborg m"]
[Site "Goteborg m"]
[Date "1955.??.??"]
[Round "7"]
[White "Bronstein"]
[Black "Keres"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[ECO "E47"]
[PlyCount "77"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ A long term Bishop sacrifice } 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 b6 6. Ne2 Bb7 7. O-O cxd4 8. exd4 O-O 9. d5 h6 10. Bc2 Na6 11. Nb5 exd5 12. a3 Be7 13. Ng3 dxc4 14. Bxh6 $3 { The consequences of this move are hardly
calculable over the board. This is not so much a combination but as a genuine
sacrifice. The definitie aspect of a combination is the fact that all the
variations can be concretely visualized; a real sacrifice on the other hand is
to a large extent based on general considerations. In addition to precise
calculation, feeling for the position now plays an important part. In the
present instance it seems that White has calculated only that he was certain
to win a second pawn on h6. For the rest, it was a matter of instinct } 14... gxh6 15. Qd2 Nh7 ( 15... Kg7 16. Nf5+ $18 ) ( 15... Ng4 16. h3 Bg5 ( 16... Ne5 17. Qxh6 Ng6 18. Nh5 Bf6 19. Rad1 d5 20. Rd4 $1 $18 ) 17. f4 Bh4 18. Nf5 $18 { recovering the sacrificed piece with a winning position } ) ( 15... Re8 16. Qxh6 Bf8 17. Qg5+ Kh8 18. Nd6 Bxd6 19. Nh5 $18 { annihilating attack } ) ( 15... Nc5 16. Qxh6 Nce4 17. Rae1 d5 18. Nf5 Ne8 19. Bxe4 dxe4 20. Re3 $18 { White's attack is too strong } ) 16. Qxh6 f5 { Thus Black gains himself
some elbow room, but he is still unable to put together a satisfactory defence } 17. Nxf5 Rxf5 ( 17... Rf6 18. Nxe7+ Qxe7 19. Bxh7+ { removing the guard } ) ( 17... Rf7 18. Nfd6 Bxd6 19. Nxd6 $18 ) 18. Bxf5 Nf8 19. Rad1 { The issue is
already beyond doubt. White has regained his sacrificed material, and
meanwhile the Black King's defences have been utterly destroyed } 19... Bg5 20. Qh5 Qf6 21. Nd6 Bc6 22. Qg4 Kh8 23. Be4 Bh6 24. Bxc6 dxc6 25. Qxc4 Nc5 26. b4 Nce6 27. Qxc6 Rb8 28. Ne4 Qg6 29. Rd6 Bg7 30. f4 Qg4 31. h3 Qe2 32. Ng3 Qe3+ 33. Kh2 Nd4 34. Qd5 Re8 35. Nh5 Ne2 36. Nxg7 Qg3+ 37. Kh1 Nxf4 38. Qf3 Ne2 39. Rh6+ 1-0
[Event "Amsterdam"]
[Site "?"]
[Date "1954.??.??"]
[Round "?"]
[White "Geller"]
[Black "Papapavlou"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[ECO "D46"]
[PlyCount "49"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 c6 5. e3 Nbd7 6. Bd3 Bd6 7. e4 dxe4 8. Nxe4 Nxe4 9. Bxe4 Nf6 10. Bc2 O-O 11. O-O c5 12. Bg5 cxd4 13. Qxd4 Be7 14. Qh4 h6 15. Bxh6 { Almost an automatic move in this and similar positions } 15... gxh6 16. Qxh6 Qa5 { The Queen is trying to get across to help the defence of
the Kingside. Forestalling the threat of Rad1 and Rd4 } 17. Ng5 e5 18. Bh7+ Kh8 19. Be4+ Kg8 20. Rae1 Bg4 21. Re3 Rad8 22. Rg3 Rd4 23. Ne6 { A problem move, which wins outright } 23... fxe6 24. Rxg4+ Nxg4 25. Qh7# 1-0
[Event "Zandvoort"]
[Site "?"]
[Date "1936.??.??"]
[Round "?"]
[White "Euwe"]
[Black "Maroczy"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[ECO "D63"]
[PlyCount "75"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. a3 h6 9. Bf4 a6 10. h3 dxc4 11. Bxc4 b5 12. Ba2 Bb7 13. O-O c5 14. Ne5 c4 15. Bb1 Re8 16. Qe2 Nxe5 17. dxe5 Nh7 18. Qh5 Nf8 19. Rcd1 Qc7 20. Bxh6 $1 gxh6 21. Rd4 f5 ( 21... Bg5 22. h4 Qxe5 23. hxg5 hxg5 24. Rg4 f6 25. Rg3 { Pf4 and Rh3 } ) 22. exf6 Bxf6 23. Rg4+ Bg7 24. Qxh6 { Although White has only
two pawns for the piece, and Black's pieces are qute well deployed, the
following moves will show that the exposure of Black's King is too much to
overcome } 24... Rad8 25. Ne2 e5 26. Ng3 Re6 ( 26... Rd6 27. Rxg7+ Qxg7 28. Qxg7+ Kxg7 29. Nf5+ { Removing the guard and double attack } ) 27. Qh4 Rd3 ( 27... Qe7 28. Rxg7+ { Removing the guard } ) ( 27... e4 28. Nxe4 Bxe4 29. Bxe4 Rxe4 30. Rxe4 Bxb2 31. f4 Rd7 ( 31... c3 32. Qg5+ Kf7 33. f5 c2 34. f6 Ne6 35. Qh5+ Kf8 36. Rxe6 c1=Q 37. Qh8+ Kf7 38. Re7+ Qxe7 39. Qg7+ Ke6 40. Qxe7+ Kd5 41. Qxd8+ $18 ) 32. Rf3 Rh7 33. Rg3+ Bg7 34. Re7 $1 Qb6 35. Qg5 Ne6 36. Qg6 ) 28. Nf5 Ng6 29. Qh5 ( 29. Rxg6 Rxg6 30. Ne7+ Qxe7 31. Qxe7 Rxg2+ 32. Kh1 Rxf2+ 33. Qxb7 Rxf1+ $19 { discovered check tactics } ) 29... Qf7 30. h4 Bf8 31. Nh6+ Bxh6 32. Qxh6 Qh7 33. Qg5 Kf7 34. Bxd3 cxd3 35. Qf5+ Ke7 ( 35... Rf6 36. Qd7+ Kg8 37. Qe8+ Kg7 38. Qe7+ Rf7 39. Qxe5+ Kf8 40. Qd6+ Kg7 41. Qxd3 $18 ) 36. h5 Nf8 37. Qxh7+ Nxh7 38. Rg7+ 1-0
[Event "candidates"]
[Site "Tournament  Zurich (Switzerla"]
[Date "1953.??.??"]
[Round "?"]
[White "Averbakh"]
[Black "Kotov"]
[Result "0-1"]
[Annotator "27: Attack against the King 0-0"]
[FEN "1r4nk/1p1qb2p/3p1r2/p1pPp3/2P1Pp2/5P1P/PP1QNBRK/5R2 b - - 0 30"]
[PlyCount "43"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ A highly unusual explosion on h3 } 30... Qxh3+ 31. Kxh3 Rh6+ 32. Kg4 Nf6+ 33. Kf5 { The King unwillingly goes to the front of his troops } 33... Nd7 34. Rg5 ( 34. -- Rf8+ 35. Kg4 Rg8+ 36. Kf5 Rf6# ) 34... Rf8+ 35. Kg4 Nf6+ 36. Kf5 Ng8+ 37. Kg4 Nf6+ { Black repeats moves to gain time } 38. Kf5 Nxd5+ 39. Kg4 Nf6+ 40. Kf5 Ng8+ 41. Kg4 Nf6+ 42. Kf5 Ng8+ 43. Kg4 Bxg5 44. Kxg5 ( 44. Rh1 Rxh1 45. Kxg5 Rh6 $1 46. Kg4 Nf6+ 47. Kf5 Ne8+ 48. Kg5 Rg8+ $1 49. Kxh6 Nf6 50. Nxf4 exf4 51. Qxf4 Rg6# ) 44... Rf7 45. Bh4 ( 45. -- Rg7+ 46. Kf5 Rf6# ) 45... Rg6+ 46. Kh5 Rfg7 47. Bg5 { Only defence } 47... Rxg5+ 48. Kh4 Nf6 49. Ng3 Rxg3 50. Qxd6 R3g6 51. Qb8+ { The familiar spite check } 51... Rg8 0-1
[Event "Zurich"]
[Site "?"]
[Date "1934.??.??"]
[Round "?"]
[White "Lasker"]
[Black "Bogolyubov"]
[Result "0-1"]
[Annotator "27: Attack against the King 0-0"]
[FEN "4r1k1/2q2ppp/p1pb4/3p4/1P6/1NP2PPb/P2Q1R1P/4N1K1 b - - 0 1"]
[PlyCount "7"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ A classic example } 1... Bxg3 $1 2. Re2 ( 2. hxg3 Qxg3+ 3. Kh1 Rxe1+ { enticing the Queen on the pinned square } 4. Qxe1 Bg2+ { Based on the pinned Rook } 5. Kg1 Bxf3+ 6. Kf1 Qh3+ 7. Kg1 Qh1# { Weak Light squares } ) 2... Bxh2+ 3. Kh1 ( 3. Rxh2 Qg3+ 4. Ng2 Bxg2 5. Rxg2 Re1+ $19 ) 3... Rxe2 4. Qxe2 Bd6 $19 0-1
[Event "London"]
[Site "?"]
[Date "1934.??.??"]
[Round "?"]
[White "Saunders"]
[Black "Winter"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[FEN "3r3r/p4pk1/5Rp1/3q4/1p1P2RQ/5N2/P1P4P/2b4K w - - 0 1"]
[PlyCount "7"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ A double explosion on g6 } 1. Rfxg6+ { Not only obvious, but forced } 1... fxg6 2. Qe7+ Qf7 ( 2... Kh6 3. Rh4+ $19 ) 3. Rxg6+ Kxg6 4. Ne5+ 1-0
[Event "Paris"]
[Site "?"]
[Date "1900.??.??"]
[Round "?"]
[White "Marshall"]
[Black "Burn"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[ECO "D55"]
[PlyCount "35"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-O 6. Nf3 b6 7. Bd3 Bb7 8. cxd5 exd5 9. Bxf6 Bxf6 10. h4 g6 11. h5 Re8 12. hxg6 hxg6 13. Qc2 Bg7 14. Bxg6 { This is no sacrifice, more like an execution } 14... fxg6 15. Qxg6 Nd7 { Black rushes toward the King but it is too late } 16. Ng5 { Typical Knight and Queen formation } 16... Qf6 17. Rh8+ { stock combination } 17... Kxh8 18. Qh7# 1-0
[Event "Hamburg"]
[Site "?"]
[Date "1955.??.??"]
[Round "?"]
[White "Matanovic"]
[Black "Kieninger"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[ECO "C43"]
[PlyCount "49"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qxd4 d5 6. exd6 Nxd6 7. Bd3 Nc6 8. Qf4 Qe7+ 9. Be3 g6 10. Nc3 Be6 11. O-O Bg7 12. Rfe1 O-O 13. Bc5 b6 14. Ba3 Bxc3 15. bxc3 Qd7 16. Rad1 Na5 17. Qh6 f6 18. Bxg6 $1 { Taking advantage of
the circumstance that the Black Queen will no longer be ably to interpose
because it must defend the Be6 (overworked piece) } 18... hxg6 19. Qxg6+ Kh8 20. Bxd6 ( 20. Rd4 Bg8 ) 20... cxd6 21. Rxe6 $1 { This new sacrifice, in
conjunction with Whte's next move, forms the basis for the whole combination } 21... Qxe6 22. Rd4 Qc4 { Only way to stop mate } 23. Rxc4 Nxc4 24. Qh5+ Kg7 25. Qg4+ { Now it all goes like clockwork; White wins the Knight as well.
Without this little tailpiece to the combination White's game with Queen
against two Knights might get have been not too easy to win } 1-0
[Event "Mar del Plata"]
[Site "?"]
[Date "1955.??.??"]
[Round "?"]
[White "Idigoras"]
[Black "Panno"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[FEN "1r3rk1/qn2pp2/b2p1npb/2p3N1/1p1P1N2/1P2P1PB/PBR2P2/3QR1K1 w - - 0 1"]
[PlyCount "37"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ A long term offer at g6. } 1. Nxg6 $3 { The knight sacrifice comes like the proverbial thunderclap out of a clear sky } 1... fxg6 ( 1... Bxg5 2. Nxe7+ Kg7 3. f4 Bh6 4. dxc5 { White's Bishops dominate the board } ) 2. Be6+ Kg7 3. f4 Nd8 { Trying to rush reserves to the threatened Kingside } 4. d5 Bc8 5. Rh2 Bxe6 { This removes the dangerous piece from White's attack. Nevertheless Black
remains remarkably helpless } 6. dxe6 Qa6 7. Qg4 Rh8 { In order to unpin the Knight with Kf8 } 8. Nf3 Qd3 9. e4 c4 10. bxc4 Qxc4 $2 ( 10... Rc8 11. f5 Be3+ ) 11. f5 $1 g5 12. Qh5 $1 ( 12. Nxg5 Kf8 $17 ) 12... Kf8 13. Qg6 Bg7 14. Rxh8+ Bxh8 15. Nxg5 Bg7 16. Nh7+ Kg8 ( 16... Nxh7 17. Bxg7+ Kg8 18. Bh6+ Kh8 19. Qg7# ) 17. Bxf6 exf6 18. Nxf6+ Kh8 19. Qh7# 1-0
[Event "Hilversum"]
[Site "?"]
[Date "1947.??.??"]
[Round "?"]
[White "Alexander"]
[Black "Szabo"]
[Result "1-0"]
[Annotator "27: Attack against the King 0-0"]
[FEN "r1bq1rk1/1p2bppp/p3p3/n3P3/4N3/1P1P1N2/PB4PP/R3QR1K w - - 0 1"]
[PlyCount "13"]
[SetUp "1"]
[Source "Hays Publishing"]
[SourceDate "1964.01.01"]

{ A characteristic Knight sacrifice on f6 } 1. Nf6+ gxf6 ( 1... Bxf6 2. exf6 gxf6 3. Qh4 e5 { Removing the guard } 4. Bxe5 fxe5 5. Ng5 ) ( 1... Kh8 2. Qe4 Bxf6 3. exf6 g6 4. Qh4 Rg8 5. Qh6 Qf8 6. Ng5 $1 { Thematic smothered mate position } 6... Qxh6 7. Nxf7# ) 2. Qg3+ Kh8 3. exf6 Bxf6 4. Ne5 Bxe5 ( 4... -- 5. Rxf6 Qxf6 6. Nc4 { winning the Queen } ) 5. Bxe5+ f6 6. Rxf6 { thematic pinning of the King } 6... Rxf6 7. Qg5 1-0