Author: Andreas Guettinger
Date: 14:34:52 09/15/05
Go up one level in this thread
On September 15, 2005 at 17:07:11, Uri Blass wrote: >On September 15, 2005 at 17:03:28, Andreas Guettinger wrote: > >>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 > >8.Qe3 is wrong > >For the correct line see > >http://www.talkchess.com/forums/1/message.html?449661 Ok, thanks. regards Andy
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