Author: Eran
Date: 22:51:16 10/12/97
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On October 12, 1997 at 16:43:45, Mike Byrne wrote: > >On October 12, 1997 at 10:12:17, Robert A. Basham wrote: > >>I noticed that most computor programs have trouble setting a trap... >>for example, in this position white plays the simple Re5, and yet it >>takes RISC-2500 8 ply and 11:53 to find it..! Maybe you can come up with >>something much faster than this... regards, Robert >> >>WK=h2 WQ=h4 WR=a1 e1 WN=f3 WP=a3 d3 d4 f2 f6 g2 h3 >> >>BK=g8 BQ=c3 BR=a8 d8 BB=b3 BP=a7 b6 c7 e6 f7 g6 h5 > >after Re5 ..it's true that Qxa1?? leads to mate...crafty sees that in 7 >seconds > > >depth=10 33/38 +262.13 Qxa1 Rxh5 gxh5 Qg5+ Kf8 Ne5 Qg1+ Kxg1 a6 Qg7+ Ke8 >Qxf7# >Nodes: 804202 NPS: 108383 >Time: 00:00:07 > >so after Qxd3 ..then what...?? > >depth=11 1/38 +1.16 Qxd3 Qf4 Kh7 Rc1 c5 dxc5 Bd5 Ng5+ Kg8 cxb6 axb6 Re3 >Qf5 >Nodes: 9108312 NPS: 114642 >Time: 00:01:19 Using 166 Pentium with MMX and 28 MB hashtable computer, Rebel8 analyzed the given position and moved 1..Qxd3! Please see the movelist below. REBEL8 against REBEL8 Rebel8 has 2504 International Elo Rate, depending on my computer. 6 minutes average per ply - I tried to find out if the given position has a forcing mate. After 1.Re5, my computer started to compute for both of sides 1..Qxd3 2.Qf4 Kh7 3.Rc1 Bc2 4.Qg3 Kg8 5.Rxh5 Rd5 6.Rxd5 exd5 7.Qxc7 Qf5 8.Rxc2 Qxf6 9.Rc6 Qf5 10.Ne5 Qf4+ 11.Kg1 Rf8 12.Qxa7 Qxd4 13.Qe7 White was winning but I saw no forcing mate from the beginning. Using Infinite setting with maximum strength (default), please see the movelist below. After I manually moved 1.Re5 Qxa1, then I let my computer compute for both of sides: 2.Rxh5 Qg1+ 3.Kxg1 gxh5 4.Qg5+ Kf8 5.Ne5 Rxd4 6.Qg7+ Ke8 7.Qh8# It took only 4 seconds and 239,418 positions evaluated.
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