Author: John Merlino
Date: 07:41:27 01/30/04
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I can't tell you how Johan determines perpetual check inside The King. But I can tell you that it finds that Rxh2 is a draw very quickly. Here are the top five moves as listed by the SKR personality on a P4-2.4 after 2 seconds: Time Depth Score Positions Moves 0:02 1/8 -3.56 490764 47...Rg2 48.h3 Rf8 49.Qe7+ Rf7 50.Qe6 Rgf2 51.Qxa6 R2f5+ 52.Kg4 Rf4+ 53.Kg3 Bf2+ 54.Kh2 Rxh4 0:01 1/7 -2.72 210618 47...Ra2 48.Qg6+ Kf8 49.Qxa6 Rxh2 50.Qd6+ Kg8 51.Qe6+ Rf7 52.Qe8+ Kg7 53.Qe6 0:01 1/7 -2.54 231865 47...Rb2 48.Qg6+ Kf8 49.Qd6+ Ke8 50.Qxa6 Kd7 51.h3 Rf5+ 52.Kg6 0:01 1/7 -2.30 300530 47...Rff2 48.a5 Rf6 49.Qd7+ Rf7 50.Qg4+ Kf8 51.Qc8+ Ke7 52.Qb7+ Kf6 53.Qxa6+ Ke7 0:01 1/7 0.00 178906 47...Rxh2 48.Qg6+ Kf8 49.Qd6+ Ke8 50.Qe6+ Kd8 51.Qd6+ Kc8 52.Qc6+ Kb8 53.Qb6+ Kc8 54.Qc6+ As you can see, it has already determined that Rxh2 is a draw after a 7-ply search. Up until that discovery, Rxh2 was the best move, with an eval of -3.7. jm
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