Author: Ed Schröder
Date: 02:12:19 12/02/99
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>rnbq1rk1/p3nppp/1p2p3/2ppP3/3P4/P1PB1N2/2P2PPP/R1BQK2R w KQ - bm Bxh7+; Aha, a standard Bxh7+ case, it made the Novag Constellation world famous :) Another nice positional sacrifice later proven right by search. On ply 5 Rebel sacs the bishop in return for a strong king attack, no material gain is involved sofar, see Rebel's main-line. On ply 7 the sac is proven right as the score goes up to 2.15. Bob, sofar Rebel's king safety is doing well, no errors seen yet :) Please recover soon BTW. 00:00:00 4.00 0.34 1.Ng5 g6 2.O-O c4 3.Be2 h6 4.Nf3 00:00:00 5.00 0.40 1.Ng5 g6 2.O-O c4 3.Be2 Ba6 00:00:01 5.26 0.40 1.Bxh7+ 00:00:01 5.26 0.63 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.h4 Qe8 4.Qg4 (1) 00:00:01 6.00 0.72 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.h4 Qe8 4.Qd3+ f5 5.h5+ Kh6 6.Nxe6+ Kh7 7.Nxf8+ Qxf8 (1) 00:00:03 7.00 2.15 1.Bxh7+ Kxh7 2.Ng5+ Kg8 3.Qh5 Re8 4.Qh7+ Kf8 5.Qh8+ Ng8 6.Nh7+ Ke7 7.Bg5+ Nf6 8.exf6+ Kd7 9.Qxg7 (1) 00:00:05 8.00 2.57 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.h4 Qe8 4.Qg4 Nf5 5.Nxe6+ Kh7 6.Qxf5+ Kg8 (3) 00:00:49 9.00 2.22 1.Bxh7+ Kxh7 2.Ng5+ Kg6 3.h4 Qe8 4.Qg4 Nf5 5.dxc5 bxc5 6.Nxe6+ Kh7 7.Qxf5+ Kh8 8.exf6+ (10) >3r3k/p1b3p1/2R1pr1p/3q4/3PQ3/5p2/P4PPP/B3R1K1 b - - bm Bxh2+; No positional sacrifice here. Bxh2+ is found by normal search at ply 7. 00:00:04 7.00 0.04 1..Bd6 2.Qxd5 exd5 3.g3 Rb8 4.Bc3 Kh7 5.Ba5 (3) 00:00:09 7.16 0.04 1..Bxh2+ 00:00:18 7.16 1.60 1..Bxh2+ 2.Kxh2 Qh5+ 3.Kg1 fxg2 4.Kxg2 Rg6 5.Kf1 Rg4 6.Qf3 Rg1+ 7.Kxg1 Qxf3 8.Rcxe6 (9) Thanks John for the positions. It allows me to waterproof an important part of my chess program. I will try to extract some positional sacrifices from my own databases and post them. Ed
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