Author: Ernst Walet
Date: 00:16:55 09/16/05
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 Problem for zappa 1.1, but shredder finds it rather fast. 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 10/32 0:01 -0.05 1.Qc3 Qxd5 2.Qc7 Qd1+ 3.Kb2 Qd4+ 4.Kb1 Qg1+ 5.Kb2 Qd4+ 6.Kb1 Qg1+ 7.Kb2 Qd4+ (1.346.881) 1149 11/35 0:01 -0.05 1.Qc3 Qxd5 2.Qc7 Qd1+ 3.Kb2 Qd4+ 4.Kb1 Qg1+ 5.Kb2 Qd4+ 6.Kb1 Qg1+ 7.Kb2 Qd4+ (2.347.352) 1183 12/38 0:03 -0.05 1.Qc3 Qxd5 2.Qc7 Qd1+ 3.Kb2 Qd4+ 4.Kb1 Qg1+ 5.Kb2 Qd4+ 6.Kb1 Qg1+ 7.Kb2 Qd4+ (4.672.846) 1210 13/40 0:05 -0.05 1.Qc3 Qxd5 2.Qc7 Qd1+ 3.Kb2 Qd4+ 4.Kb1 Qg1+ 5.Kb2 Qd4+ 6.Kb1 Qg1+ 7.Kb2 Qd4+ (7.386.329) 1237 14/42 0:13 -0.05 1.Qc3 Qxd5 2.Qc7 Qd1+ 3.Kb2 Qd4+ 4.Kb1 Qg1+ 5.Kb2 Qd4+ 6.Kb1 Qg1+ 7.Kb2 Qd4+ (17.310.407) 1247 15/44 0:30 -0.05 1.Qc3 Qxd5 2.Qc7 Qd1+ 3.Kb2 Qd4+ 4.Kb1 Qg1+ 5.Kb2 Qd4+ 6.Kb1 Qg1+ 7.Kb2 Qd4+ (38.602.764) 1276 16/47 0:52 -0.05 1.Qc3 Qxd5 2.Qc7 Qd1+ 3.Kb2 Qd4+ 4.Kb1 Qg1+ 5.Kb2 Qd4+ 6.Kb1 Qg1+ 7.Kb2 Qd4+ (68.288.986) 1290 17/51 1:56 +0.20++ 1.Qc3 Qxd5 (151.757.527) 1301 17/51 2:15 +0.20 1.Qc3 Qxd5 2.Ra7 (175.891.586) 1301 17/51 3:00 +0.21++ 1.Ra7 (234.812.457) 1302 17/51 3:05 +0.56++ 1.Ra7 (243.081.587) 1307 17/51 4:56 +2.92 1.Ra7 Bb7 (388.402.782) 1309 18/52 5:47 +3.17++ 1.Ra7 Bb7 (448.442.033) 1291 18/52 6:01 +3.67++ 1.Ra7 Bb7 (466.417.533) 1290 18/54 7:04 +5.78 1.Ra7 Bb7 2.Rxb7 Qxd5 3.Rb6 a5 4.Ra6 Ra8 5.Qe3 Rxa6 6.Kb2 axb4 7.axb4 Qa2+ 8.Kxa2 Kxb4+ 9.Kb2 Rc6 10.Bf1 Ka5 11.Qa7+ Ra6 12.Qc5 Rb8 13.Qc3+ (545.449.799) 1284 best move: Re7-a7 time: 8:34.078 min n/s: 1.276.328 CPU 199.7% n/s(1CPU): 639.122 nodes: 656.092.982
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