From: jhc@ivan.uucp (James H. Coombs)
Subject: Spassky-Fischer #4; Zarkov's Analysis
Reply-To: jhc@iris.brown.edu.uucp (James H. Coombs)
Organization: IRIS - Brown University
Date: Sun, 13 Sep 1992 18:16:12 GMT

Here is Zarkov's analysis of Spassky-Fischer, #4, a QGA that Spassky
won, thanks to a sacrifice of the exchange on move 18.  I saw a
possible improvement for S at move 29, but I can't evaluate it.  --Jim

Move               Score Ply   Suggested Line

  1. d4               30   0   BOOK
  1.       d5          5   0   BOOK
  2. c4               13   0   BOOK
  2.       dxc4        4   0   BOOK
  3. Nf3               0   0   BOOK
  3.       Nf6        -3   0   BOOK
  4. e3               -1   0   BOOK
  4.       e6         15   0   BOOK
  5. Bxc4            -11   0   BOOK
  5.       c5          0   0   BOOK
  6. O-O               5   0   BOOK
  6.       a6         13   0   BOOK
  7. dxc5              0   0   BOOK
  7.       Qxd1       14   9   d8d1  f1d1  f8c5  b2b3  b7b5  c4e2  b8d7  c1b2
                               c8b7
  8. Rxd1             27   9   f1d1  f8c5  a2a3  b7b5  b2b4  c5b6  c4e2  e8g8
                               c1b2
  8.       Bxc5       20   8   f8c5  c1d2  b7b5  c4e2  c8b7  a2a4  b7f3  e2f3
  9. b3               32   8   c1d2  b7b5  c4e2  c8b7  d2c3  b8d7  b2b4  c5e7
  9.       Nbd7        7   8   b7b5  c4e2  c8b7  c1b2  b8d7  a2a4  b7f3  e2f3
 10. Bb2              10   8   a2a4  b7b6  c1b2  c8b7  b1d2  e8g8  a1c1  c5d6
 10.       b6         19   8   b7b5  c4e2  c8b7  a2a4  b5b4  b1d2  e8g8  a1c1
 11. Nc3              26   8   f3e5  d7e5  b2e5  c8b7  b1c3  c5e7  a1c1  e8g8
 11.       Bb7        15   8   c8b7  c4e2  c5e7  a2a4  a8c8  e3e4  h7h6  e2c4
 12. Rac1             17   8   c4e2  c5e7  a1c1  a8c8  c3a4  c8c1  d1c1  e8g8
 12.       Be7        15   8   b7f3  g2f3  c5e7  c3e4  e8g8  e4f6  d7f6  c4e2
                               b6b5
 13. Nd4              16   7   c3e2  e8g8  e2f4  a8c8  b2c3  b7f3  g2f3
 13.       Rc8       -12   7   a8c8  d4f3  b6b5  c4e2  e8g8  d1d4  e6e5
 14. f3               -8   8   c4e2  e8g8  e2f3  d7c5  f3b7  c5b7  d4f3  f8d8
 14.       b5         17   7   b6b5  c4e2  e8g8  e3e4  e6e5  d4f5  e7c5  g1h1
 15. Be2               8   8   c4d3  e8g8  c3e4  f6d5  c1c8  f8c8  d1e1  e6e5
 15.       Bc5         3   7   e8g8  f3f4  e7c5  d4c2  h7h6  b3b4  c5b6
 16. Kf1              -9   7   a2a4  b5b4  c3a2  e8g8  d1d2  a6a5  e2b5
 16.       Ke7       -11   7   e8g8  f1f2  h7h6  d1d2  e6e5  d4f5  c5b4
 17. e4                8   7   e3e4  g7g6  d4c2  e6e5  c3d5  f6d5  e4d5  e7d6
 17.       g5         13   7   g7g6  d4c2  e6e5  d1d2  h8f8  b3b4  c5b6
 18. Nb1              64   7   a2a4  b5b4  c3a2  c5d6  c1c8  h8c8  f1g1
 18.       g4         20   7   g5g4  b1d2  h8g8  f1e1  g4f3  e2f3  d7e5

Someone wrote:

     18...Bd6!  There is no convenient way for White to defend h2.
     Suppose e.g. 19.h3.  Now e5, f4 and g3 are all very weak.  If 19.g3
     g4! and if 19.Kg1 g4 again ...g4 seems to give Black the initiative.

If 19...g4 gives Black the initiative, what is wrong with 18...g5,
19...Bd6?  Well, I see, 18...Bd6 would eliminate the possibility of the
Rook sac, and it is the sac with the pin of Nc5 that seems to turn the
tide.  I didn't see any errors on Fischer's part in the middle game,
just a slow degeneration of his position.

 19. Ba3               8   7   b1d2  h8g8  a2a4  g4f3  e2f3  e6e5  d4f5  e7e8
                               a4b5  a6b5
 19.       b4        -12   8   c5a3  b1a3  c8c1  d1c1  g4f3  g2f3  h8g8  d4c6
                               b7c6  c1c6
 20. Rxc5            -12   8   a3b2  g4f3  d4f3  h8g8  b1d2  f6e4  d2e4  b7e4
                               e2a6  e4f3  d1d7  e7d7  a6c8  g8c8  g2f3
 20.       Nxc5      -56   9   d7c5  a3b4  g4f3  g2f3  h8g8  f1f2  f6d7  b1c3
 21. Bxb4            -43   8   a3b4  g4f3  g2f3  h8g8  f1f2  e7e8  e2c4  e6e5
 21.       Rhd8      -38   7   g4f3  g2f3  h8g8  f1f2  e7e8  b1c3  e6e5
 22. Na3              -9   7   b1a3  g4f3  g2f3  f6d7  a3c4  d8g8  f1f2
 22.       gxf3      -22   7   g4f3  g2f3  d8g8  f1f2  f6h5  d1c1  g8g5  d4f5
                               e6f5  b4c5  e7e8
 23. gxf3            -22   8   g2f3  d8g8  a3c4  g8g5  c4b6  c8c7  f1f2
 23.       Nfd7       -6   7   f6d7  a3c4  b7a8  d4c2  e6e5  c4d6  c8c6  d6f5
                               e7e8
 24. Nc4              -3   7   a3c4  b7a8  c4e3  c8b8  b4a3  a8b7  f1e1
 24.       Ba8        -3   7   b7a8  c4e3  a8b7  e3c4
 25. Kf2               5   7   d4c2  h7h6  b4d2  h6h5  b3b4  c5a4  d2f4
 25.       Rg8        26   7   d8g8  b4a3  e7f6  c4d6  c8c7  b3b4  e6e5  b4c5
                               e5d4  e2a6  d7c5  a3c5  c7c5  d1d4
 26. h4               18   7   b4a3  e7f6  d4c2  c8c7  c4e3  a8c6  h2h4
 26.       Rc7        -3   7   f7f6  f2e3  c8c7  b4a5  c7c8  b3b4  c5b7
 27. Nc2               3   7   b4a5  c7c8  a5b4
 27.       Rb8       -12   7   f7f6  c2e3  h7h5  b4a5  c7c6  b3b4  c5b7
 28. Ba3              14   7   b4a5  c7c8  f2e3  e6e5  c4d6  c8g8  e2c4
 28.       h5         11   6   b8c8  b3b4  c5e4  f3e4  c7c4  b4b5  c4c5  a3c5
                               c8c5
 29. Rg1              45   7   b3b4  c5a4  b4b5  d7c5  b5a6  a4c3  d1a1  b8g8

 This looks worth considering: 29.b4 Na4 30.b5+ Ndc5 31.bxa6 Nc3 32.Rg1 Nf6.
 It may put a little more pressure on, although perhaps it gives Black more
 counterchances as well.  Or perhaps things just start getting wild.
 
 29.       Kf6        24   7   a8b7  b3b4  c5a4  g1g5  b8h8  b4b5  a4c5  b5b6
 30. Ke3             103   7   f2e3  b8h8  a3b2  e6e5  g1g5  f6e7  b2e5  d7e5
                               g5e5  c5e6
 30.       a5        120   8   f6e7  b3b4  c5a4  b4b5  a4c5  b5a6  b8c8  g1g5
                               c7a7
 31. Rg5             167   7   g1g5  f6e7  g5h5  b8g8  c4a5  g8g2  a5c4
 31.       a4        170   7   f6e7  g5h5  b8g8  c4a5  g8g2  a5c4  a8b7
 32. b4              187   7   b3a4  b8c8  e4e5  f6e7  g5h5  c8g8  h5g5  g8g5
                               h4g5
 32.       Nb7       176   8   c5b7  b4b5  e6e5  b5b6  c7c8  g5h5  f6e6
 33. b5              158   7   b4b5  b7c5  b5b6  c7c8  g5h5  f6e7  a3b4
 33.       Nbc5      189   7   b7c5  b5b6  c7c8  g5h5  f6e7  e3d4  f7f5  e4f5
 34. Nd4             181   7   b5b6  c7c6  c2d4  c6c8  c4d6  c8d8  g5c5  d7c5
                               a3c5
 34.       e5        162   7   f6e7  g5h5  b8c8  h5g5  c8b8  b5b6  c7c8
 35. Nxe5            194   7   d4f5  b8h8  f5g7  c7c8  a3b2  c5e6  g7e6  f6e6
                               c4e5  d7e5  b2e5
 35.       Nxe5       41   7   d7e5  g5f5  f6g7  f5e5  c5e4  f3e4  c7c3  e2d3
                               c3a3  e5g5  g7f8
 36. Rf5+            145   7   g5f5  f6g7  f5e5  c5e4  d4c6  a8c6  f3e4  f7f6
                               e5h5
 36.       Kg7       145   8   f6g6  f5e5  c5e4  a3b4  f7f6  e5e4  a8e4  f3e4
 37. Rxe5            237   7   f5e5  c5e4  e2d3  e4f6  a3d6  c7c8  d6b8  c8b8
 37.       Nxe4      235   8   c5e4  e2d3  e4f6  a3d6  c7c8  d6b8  c8b8  d4c6
 38. Bd3             242   7   e2d3  e4f6  a3d6  c7c8  d6b8  c8b8  d4c6
 38.       Rc3       237   7   e4f6  a3d6  b8b7  d6c7  b7c7  d4f5  g7h8  b5b6
 39. Bb4             264   7   a3b4  c3d3  e3d3  e4f2  d3e3  f2d1  e3f4  d1f2
                               e5g5  g7f6  f4e3  f2d1  e3e2
 39.       Rxd3+     302   8   c3d3  e3d3  e4f2  d3e3  f2d1  e3e2  b8d8  e5g5
                               g7f6  d4c2  a8b7  g5h5
 40. Kxd3            277   8   e3d3  e4f2  d3c4  b8h8  e5g5  g7f6  b4d6  h8c8
                               d6c5  c8h8  d4c6
 40.       Nf6       272   7   e4f2  d3c4  b8h8  e5g5  g7f6  b5b6  a8b7  c4b5
                               h8d8
 41. Bd6             364   7   e5g5  g7h7  b4e7  b8b6  e7f6  b6f6  g5h5  h7g7
                               h5g5  g7f8
 41.       Rc8       397   8   b8b7  e5g5  g7h7  d6e5  b7b6  e5c7  b6b7  c7d8
                               f6d7  g5h5  h7g6
 42. Rg5+            364   7   e5g5  g7h7  d6e5  f6d7  g5h5  h7g6  h5g5  g6h7
                               e5f4  a8b7
 42.       Kh7       349   8   g7h7  d6e5  f6d7  g5h5  h7g6  h5g5  g6h7  e5f4
                               f7f6  g5g2
 43. Be5             356   7   d6e5  f6d7  g5h5  h7g6  h5g5  g6h7  e5f4  f7f6
                               g5g2
 43.       Ne8       345   8   f6d7  g5h5  h7g6  h5g5  g6h7  e5f4  f7f6  g5h5
                               h7g7  a2a3  g7g6  h5h6  g6f7
 44. Rxh5+           376   8   g5h5  h7g6  h5g5  g6h7  g5g2  c8c5  e5f4  e8f6
                               f4d6  c5c1
 44.       Kg6       386   2   h7g6  h5g5  g6h7
 45. Rg5+            384   8   h5g5  g6h7  g5f5  a8d5  f5h5  h7g6  h5g5  g6h7
                               g5g2  f7f5  b5b6
 45.       Kh7       361   8   g6h7  g5g2  a8d5  b5b6  a4a3  e5f4  e8f6  f4d6
                               d5c4  d3d2  c4a2  d6a3
 46. Bf4             364   7   g5g2  a8d5  b5b6  a4a3  e5f4  e8f6  f4d6  d5c4
                               d3d2  c4a2  d6a3
 46.       f6        368   7   e8f6  a2a3  a8d5  b5b6  d5c4  d3d2  c8d8  d2c3
 47. Rf5             383   8   g5f5  c8d8  b5b6  h7g8  d3e3  a8d5  a2a3  g8f7
 47.       Kg6       410   8   c8d8  b5b6  a8b7  f5a5  e8g7  a5a7  d8d7  f4d6
                               d7d6  a7b7
 48. b6              449   7   b5b6  a8b7  f5a5  c8a8  h4h5  g6f7  a5a7  a8a7
                               b6a7
 48.       Rd8       423   8   a8b7  f5a5  c8a8  h4h5  g6h7  a5a7  a8a7  b6a7
                               b7d5  h5h6
 49. Ra5             487   7   f5a5  a8b7  h4h5  g6h7  a5a4  e8g7  f4c7  d8e8
 49.       Bxf3      517   8   a8b7  h4h5  g6f7  a5a4  d8d7  a4a7  e8g7  h5h6
                               g7e6
 50. h5+             494   7   h4h5  g6h7  a5a7  h7h8  b6b7  e8d6  f4d6  f3b7
                               h5h6