Author: Uri Blass
Date: 21:58:37 12/12/02
Go up one level in this thread
On December 12, 2002 at 22:09:48, John Merlino wrote: >On December 12, 2002 at 21:05:54, Art Basham wrote: > >>Yes, I know all the moves are checks... >>therfore it should be "very easy" to solve..; >>but why is it that some of the chess programs and engines >>that I have tested show only 1. Re4+ >>and that leads to no mate at all...?! >> >>Of course, the correct move is Rg4+...etc. >>regards >>Art.... > >Bugs? > >Well, perhaps not. White is 8 points behind in material, and Re4+ leads to an >obvious draw by repetition. Programs that do not see the mate see this draw as a >very good outcome given the difference in material. > >Rg4+ leads to a long mate (31 plies). Re4+ leads to an easy short draw. All >other moves lose. Programs that cannot see that far ahead are definitely going >to choose the draw. > >jm Not exactly. programs may choose Rg4+ for material reasons Movei can see material advantage with Rg4+ before seeing mate 3340350 <first : 8 1 121 194761 g7g4 3340400 <first : 8 30 121 195056 g7g4 3341010 <first : 8 533 187 300545 g7g4 a4b5 g4b4 b5a5 b4e4 a5b5 f3d4 b5a4 d4e2 a4b5 e2c3 b5a5 c3a2 a5b5 a2c3 b5a5 c3e2 a5b5 e2d4 b5a4 d4f3 a4b5 e4b4 b5a5 b4h4 a5b5 h4h1 3341010 <first : 8 533 187 306401 g7g4 a4b5 g4b4 b5a5 b4e4 a5b5 f3d4 b5a4 d4e2 a4b5 e2c3 b5a5 c3a2 a5b5 a2c3 b5a5 c3e2 a5b5 e2d4 b5a4 d4f3 a4b5 e4b4 b5a5 b4h4 a5b5 h4h1 3341500 <first : 9 533 236 392421 g7g4 a4b5 g4b4 b5a5 b4e4 a5b5 f3d4 b5a4 d4e2 a4b5 e2c3 b5a5 c3a2 a5b5 a2c3 b5a5 c3e2 a5b5 e2d4 b5a4 d4f3 a4b5 e4b4 b5a5 b4h4 a5b5 h4h1 3343100 <first : 9 533 396 662512 g7g4 a4b5 g4b4 b5a5 b4e4 a5b5 f3d4 b5a4 d4e2 a4b5 e2c3 b5a5 c3a2 a5b5 a2c3 b5a5 c3e2 a5b5 e2d4 b5a4 d4f3 a4b5 e4b4 b5a5 b4h4 a5b5 h4h1 3344740 <first : 10 9969 560 962845 g7g4 a4b5 g4b4 b5a5 b4e4 a5b5 f3d4 b5a4 d4e2 a4b5 e2c3 b5a5 c3a2 a5b5 a2c3 b5a5 c3e2 a5b5 e2d4 b5a4 d4f3 a4b5 e4b4 b5a5 b4b3 a5a4 b3b4 a4a5 b4b2 a5a4 3348750 <first : 10 9969 961 1646625 g7g4 a4b5 g4b4 b5a5 b4e4 a5b5 f3d4 b5a4 d4e2 a4b5 e2c3 b5a5 c3a2 a5b5 a2c3 b5a5 c3e2 a5b5 e2d4 b5a4 d4f3 a4b5 e4b4 b5a5 b4b3 a5a4 b3b4 a4a5 b4b2 a5a4 Uri
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