Author: Uri Blass
Date: 10:26:35 02/19/04
Go up one level in this thread
On February 19, 2004 at 13:15:30, Uri Blass wrote: >On February 19, 2004 at 12:02:12, martin fierz wrote: > >>On February 19, 2004 at 11:22:15, Igor Gorelikov wrote: >> >>>I don't know chess engines that can play good moves in openings without opening >>>book. >>> >>>Best regards, >>>Igor Gorelikov >> >>this is not about opening or not opening. ...O-O?? allows Bxh7+ and it's game >>over. > >It is not game over because you need also to continue it correctly. >It is probably game over after 0-0 Bxh7+ Kxh7 Ng5+ Kg6 h4 but h4 is not easy to >find. > > > my stupid engine will not play O-O on blitz level, and if O-O is played, >>it will play Bxh7+ with a positive (but not winning) score. > >Does it see the correct line with h4? >> >>to say the least, i am surprised that such strong engines don't see the problem >>with ...O-O. >> >>cheers >> martin > >I am not surprised because it is not simple tactics. > >The question if to play Bxh7+ or not to play it is a question of evaluation >and the problem of having good evaluation is not a simple question. > >Yace padderborn also cannot see Bxh7+ in a few minutes on my computer. >I know that yace underestimate king safety but my movei also has problems(it >likes Bxh7+ at small depth but with Kxh7 Ng5+ Kg6 Qd3? and later changes its >mind from Bxh7+ to Ba3 for positional reasons. > >I suspect that if you slightly reduce the value of pawns your muse will be also >unable to find Bxh7+ > > >Uri some more information latest movei(16 mbytes hash A1000) failed high on Bxh7+ again at depth 13 but it takes almost 10 minutes. Even at that depth it does not see the line Ng5+ Kg6 h4 and continue to plan the wrong Qd3 13 4 45081 87722893 c1a3 c5c4 d3e2 f7f6 d1c1 f6e5 f3e5 c6e5 a3e7 f8e8 e7h4 e5f7 h4g3 13 5 55644 107797398 d3h7 13 34 59322 114878808 d3h7 13 54 69008 133724822 d3h7 g8h7 f3g5 h7g6 d1d3 e7f5 g2g4 f7f6 g4f5 e6f5 e5f6 g7 f6 g5h3 c5d4 c1f4 c6e5 d3g3 g6f7 c3d4 13 54 72002 139929136 d3h7 g8h7 f3g5 h7g6 d1d3 e7f5 g2g4 f7f6 g4f5 e6f5 e5f6 g7 f6 g5h3 c5d4 c1f4 c6e5 d3g3 g6f7 c3d4 Uri
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