Author: Andreas Guettinger
Date: 14:03:28 09/15/05
Go up one level in this thread
On September 15, 2005 at 14:25:17, Ed Schröder wrote: >On September 15, 2005 at 14:07:05, Robert Hyatt wrote: > >>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 >> >> >>Here is one: (this on my dual xeon, searching around 2M nodes per second. WCCC >> opteron would be 8x faster... >> >> 12 13.94 -1.77 1. ... cxd4 2. Re7+ Kb6 3. Qxd4+ Kxa5 >> 4. Qc3+ b4 5. axb4+ Qxb4 6. Qc7+ Ka4 >> 7. b3+ Ka3 8. Qe5 Qb6 9. Qb2+ Kb4 10. >> c3+ Kc5 11. Qf2+ Kd6 12. Qxb6+ Kxe7 >> 13. c4 >> 12-> 20.05 -1.77 1. ... cxd4 2. Re7+ Kb6 3. Qxd4+ Kxa5 >> 4. Qc3+ b4 5. axb4+ Qxb4 6. Qc7+ Ka4 >> 7. b3+ Ka3 8. Qe5 Qb6 9. Qb2+ Kb4 10. >> c3+ Kc5 11. Qf2+ Kd6 12. Qxb6+ Kxe7 >> 13. c4 (s=2) >> 13 26.64 +1 1. ... cxd4 >> 13 34.01 -0.01 1. ... cxd4 2. Re7+ Kb6 3. Qxd4+ Kxa5 >> 4. b4+ Ka4 5. Qc3 Qxd5 6. Qc7 Qd1+ >> 7. Kb2 Qd4+ 8. Kb1 Qd1+ >> 13 2:46 -0.31 1. ... Kb6 2. Nb3 Bxd5 3. Qxd6+ Rxd6 >> 4. Rd2 Rhd8 5. Red1 Ne8 6. f4 Bf3 7. >> Rxd6+ Nxd6 8. Rd3 Be4 9. Rd2 a5 >> >>Plays Kb6 to avoid a perceived repetition after cxd4... > >Yep mine plays it too. New Challenge, which engine finds 5.Ra7!! > >This after: 1. Rxd4 cxd4 2. Re7+ Kb6 3. Qxd4+ Kxa5 4. b4+ Ka4 5. Ra7 Bb7 6. Rxb7 >Qxd5 7. Rb6 > >Ed Probably none. Is there a win after .... 7.Rb6 a5 8.Qe3 Rc8 9.Bxc8 Rxc8 10.Rxf6 Rxc2 11.Kxc2 Qa2+ 12.Kd3 Qc4+ 13.Kd2 Qa2+ 14.Ke1 Qa1+ 15.Kf2 Qxf6 ? regards Andy
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