Author: Bruce Moreland
Date: 10:17:45 02/10/99
Go up one level in this thread
On February 09, 1999 at 05:36:27, blass uri wrote: > >On February 09, 1999 at 01:58:51, blass uri wrote: > >> >>On February 08, 1999 at 17:20:31, Albert Silver wrote: >> >>>Hi, >>> >>>I thought I'd submit the following combination from Marcio Miranda-GM Felix >>>Izeta, Vince Toth Memorial, 6th round. >>> >>>6rk/3b1p2/1p1p3p/1Nb1p1r1/2P1Pp2/P2B2P1/1P3PKP/R4R2 b - - 0 26 >>> >>>The winning move is 26...Bh3+!! How long does it take for your computer to play >>>this and how long before it gives Black the advantage with this move. >>> >>>Just for your info: Black has two mating patterns here: 26...Bh3+ 27.Kxh3 f3 >>>28.Kh4? d5!! with Be7 and mate to follow, or the main line I have goes 26...Bh3+ >>>27.Kxh3 f3 28.g4! Rxg4 29.Nc3!! (best defense I've seen so far as Black is >>>threatening a second mating pattern with R8g5, Rf4, and Rh5 mate) R8g5 30.Ne2 >>>fxe2 31.Bxe2 Rxe4 and Black is winning. >> >>I gave Junior5 3 options to analyze in the position after Bh3+ and at depth 21 >>the result is Kf3 -0.17, Kxh3 -1.15,Kh1 -1.22 >> >>The main line after 27.Kf3 is Bxf1 28.Rxf1fxg3 29.hxg3 Ra8 >> >>Uri >Fritz5 sees 27.Kf3 Bg4+ 28.Kg2 Bh3+ >I am not sure if Bh3+ gives black more than a draw. > >Junior5 can find 27.Kf3 in less than 54 minutes in my pentium200MMX computer. > >The commercial Junior5 found it after looking at 415301 Knodes. >The latest Junior is a little faster in this position and needs only 406731 >Knodes. > >It is also faster at the Rxd5+ position and needs 90128 Knodes to find Rxd5 with >a positive evaluation when the commercial Junior5 needs 107974 Knodes. > >I do not want to give exact times because I did other applications at the same >time and maybe it slowed down the computer. Superficially it seems that Bh3+ Kxh3 leads to a game where black is up a pawn and white's kind of cracked up. I'd be confident if my program achieved that position. After Bh3+ Kf3 Bxf1 Rxf1 I'd be doing a lot better I think. Mine sees Bh3+ at about three minutes, expecting Kxh3 in response, but expects Kf3 in response at the next ply (15 minutes or so), all times on a P2/300. bruce
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