Stalemate trap(SOS-Delfi)

[Lyapko George]

Geschrieben von: / Posted by: Lyapko George at 18 December 2001 13:07:45:
Today I've analyzed the game SOS-Delfi from Gunther Simon's WinterRapid tournament and have found it very interesting from chess programming view. After SOS blunder on move 88 Delfi could make a draw, but missed it...
It seems that Gunther has no KRPKR EGTB(on my computer SOS makes 100.Rg8+ without thinking)...
It is hard for many programs to avoid such stalemate traps, and I wonder which programs will solve all these positions (with or without EGTB's)...
Here they are:
k2r4/P3K1R1/8/7P/8/6P1/8/8 w - - bm Rg4 Rg5 Rg6;id "Move 88:Source of troubles";all other moves leads to draw - hard for most of programs
k7/P5R1/7P/8/8/6P1/4r3/5K2 b - - bm Rf2+;id "Move 96:draw";easy for programs with rep.draw in search - Delfi played 96...Re1+
k7/P5R1/7r/8/6K1/6P1/8/8 w - - bm Rg8+ Rg5;id "Move 100:white wins";not very easy without EGTB's.SOS played here 100.Kg5??
k7/P5R1/5K2/7r/8/6P1/8/8 b - - bm Rf5+;id "Move 101:stalemate trap";Delfi played 101...Rh6+?? and lost the game
k2K4/P5R1/8/4r3/8/6P1/8/8 b - - bm Re8+;id "After possible 101...Rf5+ 102.Ke7 Re5+ 103.Kd8";not 103..Rd5+?? 104.Rd7 Rg5 105.Rd3 Kxa7 106.Ke7 and white wins...

BTW, current version of Bestia (0.85) solves all of them except 1st one in less than 10sec on my AMD K6-2/450
Best regards,
George

[Günther Simon]

Geschrieben von: / Posted by: Günther Simon at 18 December 2001 16:03:09:
Als Antwort auf: / As an answer to: Stalemate trap(SOS-Delfi) geschrieben von: / posted by: Lyapko George at 18 December 2001 13:07:45:

Today I've analyzed the game SOS-Delfi from Gunther Simon's WinterRapid tournament and have found it very interesting from chess programming view. After SOS blunder on move 88 Delfi could make a draw, but missed it...
It seems that Gunther has no KRPKR EGTB(on my computer SOS makes 100.Rg8+ without thinking)...
It is hard for many programs to avoid such stalemate traps, and I wonder which programs will solve all these positions (with or without EGTB's)...
Here they are:
k2r4/P3K1R1/8/7P/8/6P1/8/8 w - - bm Rg4 Rg5 Rg6;id "Move 88:Source of troubles";all other moves leads to draw - hard for most of programs
k7/P5R1/7P/8/8/6P1/4r3/5K2 b - - bm Rf2+;id "Move 96:draw";easy for programs with rep.draw in search - Delfi played 96...Re1+
k7/P5R1/7r/8/6K1/6P1/8/8 w - - bm Rg8+ Rg5;id "Move 100:white wins";not very easy without EGTB's.SOS played here 100.Kg5??
k7/P5R1/5K2/7r/8/6P1/8/8 b - - bm Rf5+;id "Move 101:stalemate trap";Delfi played 101...Rh6+?? and lost the game
k2K4/P5R1/8/4r3/8/6P1/8/8 b - - bm Re8+;id "After possible 101...Rf5+ 102.Ke7 Re5+ 103.Kd8";not 103..Rd5+?? 104.Rd7 Rg5 105.Rd3 Kxa7 106.Ke7 and white wins...

BTW, current version of Bestia (0.85) solves all of them except 1st one in less than 10sec on my AMD K6-2/450
Best regards,
George

Yes George this tournament is played only with all 4men EGTBS.
(Just to be carefully with my new HD after the experiences with
my BulletProof tourney Morever I believe this setting is more
like the typical user has it)
So I was right in my previous post which you seemed to have overseen.
Best Regards,
Günther

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