Author: Jaime Benito de Valle Ruiz
Date: 07:55:06 12/04/03
(ALL these tests are done with 3,4 and some 5 tablebases in an Athlon 1900+ with 512 Mb) This position was recently posted by Joachin Rang, and no one really suggested why is it so hard for commercial engines: [D]8/5R2/2p5/8/7P/1K2b3/P3kp2/8 w - - 0 1 My guess is that some engines' evaluation are not "aware" of the danger of two passed pawns being stopped just by a bishop, and because of pruning and/or Null-move, they need to reach a great depth to find the move. For example, in this position (4 plies after the initial one)... [d]8/8/2p5/8/7P/4b3/P1K5/5k2 w - - 0 3 Shredder 7 needs a depth of 17 to give it a positive score (over +4.00), and realize it's winning. Fritz 8 needs only 14 to come up with a positive score(+0.44), but it takes longer than for Shredder. Later, at depth 17 the score is a convincing +5.75. Junior 8 needs to reach depth 21 (fast, though). [D]8/6p1/P1b1pp2/2p1p3/1k4P1/3PP3/1PK5/5B2 w - - In this other position, the problem appears to be the same: After several plies we have: [d]8/P5p1/8/2p1p3/1k1P4/4p3/1PK3b1/8 w - - 0 6 Both Fritz and Shredder need depth 12 from here to give a positive score! Any (bad) player would realize almost instantly that white are winning here! Does it make sense what I'm saying? Regards, Jaime
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