Author: Ernst Walet
Date: 00:34:46 09/16/05
Go up one level in this thread
On September 15, 2005 at 07:21:19, Ed Schröder wrote: >On September 15, 2005 at 06:43:22, Gian-Carlo Pascutto wrote: > >>On September 15, 2005 at 06:26:30, Ed Schröder wrote: >> >>>On September 15, 2005 at 04:30:38, Mark Young wrote: >>> >>>>On September 14, 2005 at 17:05:59, Ernst Walet wrote: >>>> >>>>>Because Zappa 1.1 is SMP and 64 bit, I gave it a try and was pleasant suprised. >>>>>One of my favourite chess positions is this one, where Kasparov played Rxd4. >>>>>How do other engines do? If your engine finds it please give it a couple of more >>>>>plies to see if it holds it. >>>> >>>>The better test for the engine in this position, is to see when the program see >>>>that Rxd4 is not winning. Since Rxd4 is only a draw with best play. >>>>This is why many programs will not play Rxd4, or drop the move with a longer >>>>search. >>> >>>1. Rxd4 cxd4 2. Re7+ Kb6 3. Qxd4+ Kxa5 4. b4+ Ka4 5. Ra7 Bb7 6. Rxb7 Qxd5 7. Rb6 >>>1-0 >> >>I always thought that simply 1. .. Kb6 was never refuted? > >You are absolutely right, missed that one. But I would like to see the engine >that plays 1..Kb6 > >Hmmm... > >Ed Shredder plays it in 24 seconds on my 4200+ Ernst. CPU0: AuthenticAMD AMD64 Family 15 Model 43 Stepping 1 2203 MHz CPU1: AuthenticAMD AMD64 Family 15 Model 43 Stepping 1 2203 MHz GUI: Tablebases with 5 pieces found! [Cache: 16 MB + internal 13.67 MB] Engine: Deep Shredder 9 x64 (1000 MB) by Stefan Meyer-Kahlen 11/27 0:01 +0.54 1...Bxd5 2.Qxd6 Rxd6 3.Rd2 Rhd8 4.Re7+ Kb6 5.Nb3 a5 (1.267.319) 1210 12/25 0:01 +0.31 1...Bxd5 2.Qxd6 Rxd6 3.Rd2 Kb6 4.b4 (2.301.774) 1217 12/34 0:03 +0.32++ 1...Kb6 (4.082.874) 1209 12/34 0:04 +0.39 1...Kb6 2.b4 Qxf4 3.Rxf4 Nxd5 4.Rxf7 cxb4 5.axb4 Nxb4 6.Nb3 Bd5 7.Rf6+ Nc6 8.Nd4 Rhe8 9.Rxe8 Rxe8 (5.818.777) 1213 13/35 0:06 +0.58 1...Kb6 2.b4 Qxf4 3.Rxf4 Nxd5 4.Rxf7 cxb4 5.axb4 Nxb4 6.Nb3 Bd5 7.Rf6+ Nc6 8.Nd4 a5 9.Bf1 Rhf8 10.Rxf8 Rxf8 (8.260.679) 1232 14/37 0:10 +0.54 1...Kb6 2.b4 Qxf4 3.Rxf4 Nxd5 4.Rxf7 cxb4 5.axb4 Nxb4 6.Nb3 Bd5 7.Rf6+ Nc6 8.Nd4 Rdf8 9.Rxf8 Rxf8 10.Nxc6 Kxc6 11.f4 (13.527.491) 1247 14/37 0:13 +0.55++ 1...Bxd5 (16.616.570) 1266 14/37 0:13 +0.55 1...Bxd5 2.Qxd6 Rxd6 3.Rdd1 Rhd8 4.b4 (17.099.167) 1270 15/36 0:19 +0.63 1...Bxd5 2.Qxd6 Rxd6 3.Rdd1 Rhd8 4.b4 Kb6 5.bxc5+ Kxc5 6.Rxd5+ Nxd5 7.Nb7+ Kd4 (24.675.354) 1276 15/41 0:24 +0.64++ 1...Kb6 (31.967.143) 1285 15/41 0:29 +0.70 1...Kb6 2.b4 Qxf4 3.Rxf4 Nxd5 4.Rxf7 cxb4 5.axb4 Nxb4 6.Nb3 Bd5 7.Rf6+ Nc6 8.Nd4 Rdf8 9.Rd6 Kc5 10.Rxc6+ Bxc6 11.Ne6+ Kc4 12.Nxf8 Rxf8 (38.082.048) 1311 16/39 0:43 +0.65 1...Kb6 2.b4 Qxf4 3.Rxf4 Nxd5 4.Rxf7 cxb4 5.axb4 Nxb4 6.Nb3 Bd5 7.Rf6+ Nc6 8.Nd4 Rdf8 9.Rxf8 Rxf8 10.Nxc6 Kxc6 11.f4 Kc5 12.Re7 (57.419.093) 1305 17/42 1:19 +0.71 1...Kb6 2.b4 Qxf4 3.Rxf4 Nxd5 4.Rxf7 cxb4 5.axb4 Nxb4 6.Nb3 Bd5 7.Rf6+ Nc6 8.Nd4 Rdf8 9.Rd6 Kc5 (103.831.202) 1308 18/45 2:22 +0.55 1...Kb6 2.b4 Qxf4 3.Rxf4 Nxd5 4.Rxf7 cxb4 5.axb4 Nxb4 6.Nb3 Bd5 7.Rf6+ Nc6 8.Nd4 Rdf8 9.Rxf8 Rxf8 10.Nxc6 Kxc6 11.f4 Kc5 12.Re7 Rf7 13.Rxf7 Bxf7 (184.940.678) 1296 19/49 5:07 +0.70 1...Kb6 2.b4 Qxf4 3.Rxf4 Nxd5 4.Rxf7 cxb4 5.axb4 Nxb4 6.Nb3 Bd5 7.Rf6+ Nc6 8.f4 Rhf8 9.Rxf8 Rxf8 10.Bd7 Rd8 11.Bxc6 Kxc6 12.Kb2 Kb6 13.Nd4 a5 14.Re7 (393.665.708) 1280 20/51 9:05 +0.52 1...Kb6 2.b4 Qxf4 3.Rxf4 Nxd5 4.Rxf7 cxb4 5.axb4 Nxb4 6.Nb3 Bd5 7.Rf6+ Nc6 8.f4 b4 9.Re7 Bxb3 10.cxb3 Kc5 11.Ree6 (691.801.815) 1269 best move: Ka7-b6 time: 12:43.328 min n/s: 1.246.372 CPU 199.7% n/s(1CPU): 624.122 nodes: 951.372.333
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