Author: John Merlino
Date: 17:34:09 02/18/04
Go up one level in this thread
On February 18, 2004 at 19:16:13, Geoff Westwood wrote: >I have just been looking through some games my program lost in a tourney. > >La Dame Blanche (white) v Waster (Black) > >Here is a another avoid move example, this was a corker of a bad move by Waster > >[D]2r1r1k1/5pp1/p1q4p/1pnNP1b1/2P4P/1P3Q2/PB6/R5RK b - h3 0 27 > >Looking at the log it thought for 1min 9 secs before playing the gem of a move >Bxh4. > >Is my program being very dumb or is this a hard move to avoid ? Interested to >see what other programs think of it ? > >I wonder how I can improve it to stop it taking that pesky pawn, havent got much >of an idea at the moment > > Geoff Well, according to Chessmaster 9000 (SKR personality on a P4-2.4), it looks like Black is lost anyway. The engine avoids Bxh4 in one second, switching to bxc4 and sticking with it for over four minutes. But the eval just keeps getting worse and worse until it finds a meaningless improvement: Time Depth Score Positions Moves 0:00 1/3 0.35 2181 27...Bxh4 28.Raf1 Qd7 0:00 1/4 0.20 6336 27...Bxh4 28.Raf1 Qb7 29.Bd4 Ne6 0:00 1/5 0.14 36229 27...Bxh4 28.Raf1 Qe6 29.Rg4 Bg5 0:00 1/6 1.16 105033 27...Bxh4 28.Rxg7+ Kxg7 29.e6+ f6 30.Rg1+ Kf8 31.Bxf6 Rxe6 32.Bxh4+ Ke8 0:01 1/6 1.02 231055 27...bxc4 28.hxg5 Nd3 29.Raf1 Nxb2 30.Qxf7+ Kh8 0:02 1/7 0.78 412579 27...bxc4 28.hxg5 Nd3 29.Bd4 cxb3 30.axb3 Nxe5 31.Qe4 Rcd8 0:05 1/8 0.78 1050776 27...bxc4 28.hxg5 Nd3 29.Bd4 cxb3 30.axb3 Nxe5 31.Qe4 Rcd8 0:23 1/9 0.76 4235670 27...bxc4 28.hxg5 Nd3 29.Bd4 cxb3 30.axb3 Nxe5 31.Qe4 Qd7 32.Rg3 Nd3 0:44 1/10 1.31 8235955 27...bxc4 28.hxg5 Nd3 29.Raf1 Kh8 30.Rg3 Nxe5 31.Qe4 Qd6 32.Bxe5 Rxe5 2:13 1/11 1.95 25253896 27...bxc4 28.hxg5 Nd3 29.Raf1 Kh8 30.Rg2 Nxe5 31.Bxe5 Rxe5 32.bxc4 Rxg5 33.Rxg5 hxg5 34.Kg1 Qh6 35.c5 4:05 1/11 1.92 46950347 27...Ne6 28.cxb5 axb5 29.hxg5 Nf4 30.Rad1 hxg5 31.Rd2 Nxd5 32.Qxd5 Qh6+ 33.Rh2 5:02 1/12 1.87 58751202 27...Ne6 28.cxb5 Qxb5 29.hxg5 Nxg5 30.Rxg5 hxg5 31.Rf1 Qd7 32.Nb6 g4 33.Qg2 Qd3 34.Nxc8 Rxc8 Now, Bxh4 is a bad move, no doubt about it. So you still have the problem of knowing how to avoid it. After forcing that move, The King very nicely announces Mate in 16 in 37 seconds.... Thanks for the cool position! :-) Time Depth Score Positions Moves ---- ---- ---- ---- ---- 0:00 1/3 0.33 3286 28.Raf1 Qb7 29.Bd4 Ne6 0:00 1/4 0.29 12957 28.Raf1 Qe6 29.Rg4 Bg5 0:00 1/5 0.21 37719 28.Raf1 Qe6 29.Rg2 Nd7 30.Rh2 Bg5 0:00 1/5 1.36 46513 28.Rxg7+ Kxg7 29.e6+ f6 30.Rg1+ Kf8 31.Bxf6 Rxe6 32.Bxh4+ Ke8 0:00 1/6 5.04 80208 28.Rxg7+ Kxg7 29.e6+ f6 30.Rg1+ Kf8 31.Bxf6 Rxe6 32.Bxh4+ Rf6 33.Bxf6 Kf7 0:00 1/7 5.36 166156 28.Rxg7+ Kxg7 29.e6+ f6 30.Rg1+ Kf8 31.Bxf6 Rxe6 32.Bxh4+ Rf6 33.Bxf6 Ne6 34.Bd4+ Ke8 0:02 1/8 5.78 470846 28.Rxg7+ Kxg7 29.e6+ f6 30.Rg1+ Kf8 31.Bxf6 Rxe6 32.Bxh4+ Rf6 33.Bxf6 Qe6 34.Be5+ Qf7 35.Bd6+ Ke8 0:05 1/9 6.17 1339491 28.Rxg7+ Kxg7 29.e6+ f6 30.Rg1+ Kf8 31.Bxf6 Rxe6 32.Bxh4+ Rf6 33.Bxf6 Qe6 34.Be5+ Ke8 35.Rg8+ Qxg8 36.Nf6+ Ke7 37.Nxg8+ Rxg8 0:13 1/10 12.31 3594530 28.Rxg7+ Kxg7 29.e6+ f6 30.Rg1+ Kf8 31.Bxf6 Rxe6 32.Bxh4+ Rf6 33.Qg4 Rg6 34.Qf5+ Kg7 35.Bf6+ Kf8 36.Qxg6 Qxd5+ 37.cxd5 0:37 1/11 Mate16 10654563 28.Rxg7+ Kxg7 29.e6+ f6 30.Rg1+ Kf8 31.Bxf6 Rxe6 32.Bxh4+ Rf6 33.Qg4 Rg6 34.Qf5+ Qf6 35.Bxf6 Rxg1+ 36.Kxg1 Rc7 37.Be7+ Ke8 38.Qg6+ Kd7 39.Qd6+ Ke8 40.Nxc7+ Kf7 41.Qf6+ Kg8 42.Qg6+ Kh8 43.Bf6# 1:40 1/12 Mate15 29572647 28.Rxg7+ Kxg7 29.e6+ f6 30.Rg1+ Kf8 31.Bxf6 Rxe6 32.Bxh4+ Rf6 33.Qg4 Rg6 34.Qf5+ Ke8 35.Rxg6 Qxg6 36.Qxg6+ Kd7 37.Bg3 Nb7 38.Qf7+ Kc6 39.Qe6+ Nd6 40.Qxd6+ Kb7 41.Qb6+ Ka8 42.Qxa6# jm
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