Jun-29-09
 | | Pawn and Two: An important encounter in round three at Nuremberg 1906. Marshall had started the tournament with wins over Duras and E. Cohn, while Tarrasch started the tournament with a very fortunate draw against Wolf, and then a loss to Salwe. The position after 21...Rdf8 was nearly equal:
 click for larger viewAccording to Fritz, White should then play: (-.01) (21 ply) 22.g4 Qb4, or (-.12) (21 ply) 22.Re5 Qc5+, with a near equal game. Instead, Tarrasch made three errors in his next three moves, and obtained a lost position. First he erred with (-.53) (21 ply) 22.Re3? Qc5, and then with (-.98) (21 ply) 23.g4? h5, instead of (-.45) (21 ply) 23.Nd1! g6 24.g4 gxf5 25.Rxf5, and finally with (-1.57) (23 ply) 24.h3?. Black is probably winning after 23.g4? h5, but Fritz prefers at move 24: (-.96) (23 ply) 24.Kg2 hxg4 25.Re5 Na6 26.Qd2 Qd6 27.Nd3, or (-1.03) (23 ply) 24.Qd2 Re8 25.Nd1. While Fritz did not prefer 24.h3, it had one good advantage over the alternatives. After 24.h3, Black had only one winning move.  click for larger viewIn this position, Black can force the win of material and the game by: (-1.54) (22 ply) 24...Re8! 25.Rff3 Re4, (-1.78) (22 ply) 26.Rg3 h4 27.Rgf3 Ne6 28.Kh1 Nd4 29.Rxe4 dxe4 30.Qc3 Qd5 31.Re3 g6, (-2.54) (20 ply) 32.Qe1 Nxc2 33.Qxh4 Kg7 34.Re2 e3+ 35.Kg1 Qe4, or (-2.55) (20 ply) 32.Nd1 gxf5 33.Nf2 Rf7 34.Kg2 c5 35.a5 Re7 36.Qc4 Qxc4 37.bxc4 Nxc2. Marshall did not play the winning move 24...Re8!, and after (-.27) (22 ply) 24...hxg4? 25.hxg4, his advantage was minimal. |
Jul-02-09
 | | Pawn and Two: After Marshall missed a win, 24...Re8!, the game was roughly equal. In analysis, Fritz slightly favors Black: (-.27) (22 ply) 24...hxg4? 25.hxg4, (-.26) (22 ply) 25...Re8 26.Rff3 Re4 27.Rg3. At move 29, Fritz prefers: (-.17) (19 ply) 29...Kf7 30.c3 Qa3 31.Qc2 Qd6 32.Qd3 Qe5. Instead, Marshall played 29...Qb4, with a position slightly favoring White: (.25) (19 ply) 29...Qb4 30.Nf2 Rxe3 31.Rxe3. At move 31, Marshall had a number of moves that would give White only a small advantage.  click for larger viewFritz prefers (.29) (21 ply) 31...Qc5 32.Re2 Kf8 33.Kf3 Rxe2 34.Qxe2 Ne8, or (.28) (21 ply) 31...Qd6 32.Rxe8+ Nxe8 33.Qe3 Nf6 34.Qg3 Qxg3+ 35.Kxg3, or (.28) (21 ply) 31...a6 32.Rxe8+ Nxe8 33.Qe3 Kf8 34.Kf3 Qd6, all lines with good drawing chances. Instead, Marshall made a serious error with: (1.47) (21 ply) 31...Rxe3? 32.Qxe3. After 31...Rxe3?, it was Tarrasch's turn to deal with a winning position! |