Author: blass uri
Date: 02:36:27 02/09/99
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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. Uri
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