Willi Schlage
Willi Schlage (24 December 1888 – 5 May 1940 in Berlin) was a German chess master and trainer. Active as a player during the inter-war years of the Weimar Republic and later as a trainer during the rise of the Third Reich, Schlage is remembered for a game depicted in the science fiction film "", which chess writers attributed to him. He is also known for an endgame position attributed to a game played with Carl Ahues, frequently presented as an example in endgame literature. Career. In 1910 Schlage won a tournament in Hamburg (DSB Congress, "Hauptturnier-B"). He  played in friendly matches: Berlin–Prague (1913), Berlin–Holland (1920), Germany–Netherlands (1922), and Germany–Sweden (1922). Schlage twice won the Berlin City Chess Championship in 1921 and 1926. During the inter-war period Schlage was active in the lively chess culture of Berlin, where tournaments were commonly held at cafés and restaurants. In 1925 Schlage was photographed participating in a simultaneous exhibition against then-champion José Raúl Capablanca. In wider competition, Schlage posted middling results. He took 3rd place at Hamburg 1921 ("21st DSB-Congress", Ehrhardt Post won), tied for 3rd–5th at Bad Oeynhausen 1922 ("22nd DSB-Congress", Post  won), tied for 11th–13th at Berlin 1928 ("BSG", Aron Nimzowitsch won), tied for 5th–7th at Berlin 1930 (Karl Helling won), tied for 7th–8th in the Berlin-ch 1932 (Helling won), tied for 8th–9th at Swinemünde 1932 (Gösta Stoltz won), tied for 6th–7th in the Berlin-ch 1933 (Berthold Koch and Kurt Richter won), tied for 11th-13th at Bad Aachen 1935 ("3rd" German Championship, Richter won), tied for 3rd–4th at Berlin 1937 ("BSG-B", Carlos Guimard and Ludwig Rellstab won), and tied for 4th–7th at Krefeld 1938 (Erich Eliskases and Ludwig Engels won). These performances led Tim Krabbé to criticize Schlage  as "a player of second-level prominence. You come across his name in old German combination books, more often as the loser than as the winner, and in a few German tournaments, more often near the bottom than near the top." On the other hand, Schlage was ranked as the world's 31st best player in a statistical analysis corresponding to his peak performance (August 1923), which indicated a level of play typical of a grandmaster. Roesch vs. Schlage, 1910. In 1910 Schlage defeated an opponent (one Roesch) in a 15-move which opened with the Ruy Lopez; the game  was later reproduced in a 1955 collection by Irving Chernev. In the 1968 film "2001: A Space Odyssey", a HAL 9000 supercomputer is shown defeating astronaut Frank Poole at the conclusion of a game, with moves and board positions identical to the conclusion of the Roesch-Schlage game. Chess writers have therefore attributed the film's game to Schlage's. Schlage vs. Ahues, 1921. A frequently reproduced endgame problem is attributed to a game played by Schlage (White) and Ahues (Black) in Berlin, 1921. Schlage had an opportunity to win, but he with an incorrect king movement, at which point  Ahues was able to force a draw. Each player has two pieces: one pawn and one king, with White to move. The pawns block each other's paths, unable to move of their own accord, and the kings are posted at nearly equal distance from this deadlock. Each king must advance toward the deadlocked pawns, either with the aim of capturing the opposing pawn and thus clearing the way for (thereby securing a win), or else by frustrating this design and thus denying the opponent a win, forcing a draw. According to Jesus de la Villa, the game's sequence  at this point was 1. Ke6 Kc3 2. Kd6? Kd4 3. Kc6 Ke5 4. Kb7 Kd6 5. Kxa7 Kc7 ½-½. Once the black king occupies the critical c7 square and corners its white counterpart, it forces a draw, whether by threefold repetition, stalemate, or agreement. White should instead have played 2. Kd5! Kd3 3. Kc6 Kd4 4. Kb7 Kd5 5. Kxa7. With this path, the white king has just enough time to secure all the requirements for a win: capture the black pawn, get out of its own pawn's way, prevent Black from accessing the c7 square, and prevent  Black from recapturing the white pawn. Bruce Pandolfini gave a shortened version of the composition in an endgame book of his own, not attributing the position to the Schlage-Ahues game. Pandolfini takes up the composition following 1. Ke6 Kc3, where White still has an opportunity to win—and also an opportunity to blunder. Pandolfini's version of the incorrect solution ran 2. Kd6 Kd4 3. Kc6 Ke5 4. Kb7 Kd6 5. Kxa7 Kc7 6. Ka8 Kb6 7. a7 Kc7 ½-½, agreeing with de la Villa's version, though adding final moves such that the game ends in stalemate. Pandolfini 's version of the correct solution ran 2. Kd5 Kb4 3. Kc6 Ka5 4. Kb7 Kb5 5. Kxa7 Kc6 6. Kb8 Kb6 7. a7. This variation is a bit better for Black than de la Villa's, in the sense that Black does not play the 4... Kb5 until forced to do so; in de la Villa's version, Black immediately concedes the waiting move 2... Kd3 once White has played the correct 2. Kd5. Further, Pandolfini's solution includes 6. Kb6, necessary to ensure that Black remains unable to access c7, and also to enable the white pawn to  promote while denying Black an attack upon it. When presented as a problem, there are two points about the position. First, players can make tactical use of the fact that kings can never occupy adjacent squares—a king can never move into check. By moving one's king next to a square, the opponent's king is prevented from moving to that square on the following move. This technique is referred to as "bodychecking", or "shouldering". By playing 2. Kd5!, White forces Black to make a waiting move at some point, which loses time and fails to access c7. Second , the geometry of the chessboard—and the movement of the pieces—is non-Euclidian: a king can follow advantageous diagonal paths and still reach a given square in the same number of moves as if it had moved along a "straight line" in a given or . The chessboard and certain pieces' movements are more akin to taxicab geometry; the king's movement, specifically, follows the Chebyshev metric. Trainer. In 1935, Schlage became "Reichstrainer des Großdeutschen Schachbundes" (Chief Trainer of the German Chess Federation). Together with Alexander Alekhine and Efim Bogoljubow, he trained the German national team for the 3rd unofficial  Chess Olympiad at Munich 1936. In August 1939, he trained the best young German players (Klaus Junge (15 years old), Wolfgang Unzicker (14), Edith Keller (17), Karl Krbavic (17), Rudolf Kunath (15), etc.) in Fürstenwalde ("Jugendschachwoche"). 1979 Mali chess stamps. In 1979, the African country Mali issued a quartet of stamps depicting chess masters; Alekhine, Bogoljubow and Schlage were represented, together with Dawid Janowski. Tim Krabbé found Schlage's inclusion among much stronger players to be incongruous and suspected that the stamps were designed by a German, on account of the individuals' roles in German chess during the war (although  Janowski had died in 1927). A correspondent later informed Krabbé that the stamps were executed by a French designer.