Author: Andreas Guettinger
Date: 10:25:21 09/15/05
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 Hiarcs 9.6 plays it even on on 400Mhz: 5 -1.25 cxd4 Qxd4+ Qb6 Re7+ Nd7 Rxd7+ Rxd7 (0.86) 6 -1.58 cxd4 (1.82) 6 -1.97 cxd4 Qxd4+ Qb6 Re7+ Nd7 Rxd7+ Rxd7 Qxh8 Rd8 Qc3 Qg1+ (2.62) 7 -1.65 cxd4 (3.70) 7 -0.66 cxd4 Qxd4+ Qb6 Re7+ Nd7 Qc3 b4 axb4 f5 Qc4 (5.50) 8 -0.98 cxd4 (10.07) 8 -1.00 cxd4 Qxd4+ Qb6 Re7+ Nd7 Qc3 Rhe8 Rxe8 Rxe8 Bxd7 Bxd5 (10.31) 9 -1.32 cxd4 (22.14) 9 -1.94 cxd4 Qxd4+ Qb6 Re7+ Nd7 Qc3 Rhe8 Rxd7+ Rxd7 Bxd7 Bxd5 b3 Re3 Qc8 Qxa5 (26.66) 10 -2.07 cxd4 Qxd4+ Qb6 Re7+ Nd7 Nb3 f5 Rxd7+ Rxd7 Qxh8 Bxd5 Qd4 Qxd4 (83.59) 11 -1.75 cxd4 (155.35) 11 +0.00 cxd4 Re7+ Kb6 Qxd4+ Kxa5 b4+ Ka4 Qc3 Qxd5 Qc7 Qd1+ Kb2 Qd4+ Kb1 Qg1+ Kb2 Qd4+ (198.79) 11 -0.01 Kb6 (396.21) 11 -0.21 Kb6 Nb3 Bxd5 Qxd6+ Rxd6 Rd2 Rhd8 Red1 Ne8 f4 Bxb3 Rxd6+ Rxd6 (456.24) regards Andy
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