Author: Uri Blass
Date: 00:24:30 12/13/02
Go up one level in this thread
On December 13, 2002 at 01:31:29, John Merlino wrote: >On December 13, 2002 at 00:58:37, Uri Blass wrote: > >>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 > >Is it truly a material advantage that Movei is seeing? Because even after the >full mating sequence, White is still down 3 points of material. > >jm Yes At depth 8,9 it is material [D]1b6/4R3/rp6/k2K4/1R6/pp3N2/1p1B4/7q w - - 0 13 In this position that is in the main line movei see 13.Rh4+ Kb5 14.Rxh1 insead of the slightly longer mate sequaence Uri
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