Author: John Merlino
Date: 22:08:41 02/21/06
Go up one level in this thread
On February 21, 2006 at 22:44:50, Will Singleton wrote: >On February 21, 2006 at 22:27:37, Will Singleton wrote: > >>On February 21, 2006 at 22:02:42, Jon Dart wrote: >> >>>[D] 8/6p1/8/1K4p1/P7/1n6/6k1/6B1 w - - >>> >>>How long to find Bb6 with a + score? (Ba7 is also good). >>> >>>--Jon >> >>Amateur 2.86 (32 secs, amd 4200+): >> >>15 85 484 3230297 Be3 Kf3 Bxg5 Ke4 Kc4 Na5 Kc5 Nb3 Kb5 Nd4 >>16 86 1210 8354042 Be3 g4 >>17 85 1861 12636363 Be3 Kf3 >>17 170 3270 22212398 Bb6 g6 Kc4 Nd2 Kd3 Nf3 a5 Ne5 Kc3 Nd7 Bd8 Nc5 >>18 454 8938 60402156 Bb6 Kh1 >>19 457 15951 108895881 Bb6 Kf3 Kb4 Ke4 Kxb3 Kd5 a5 Kc6 Kc4 Kb7 Kd4 Ka6 >> Ke4 g6 Bc7 Kb7 Bd8 g4 >> >>Rybka gets it in < 1 sec, but I didn't see another program get it fast in >>limited testing. >> >>Will > > >Ack, you fooled me, I think. Isn't Bb6 actually a draw? Even though Rybka and >Spike give +4 immediately, I think it's because they can't see that the king can >block the a pawn indefinitely. Or, is there some egdb that shows a solution? > >Will The King (CM9_R1) seems to have the draw figured out. Here's what it says on a P4-2.4: Time Depth Score Positions Moves 0:00 2/9 0.00 71489 1.Kb4 Kxg1 2.Kxb3 g4 3.a5 g3 4.a6 g2 5.a7 Kf1 6.a8=Q g1=Q 7.Qa1+ Kf2 8.Qa7+ Kf1 9.Qa1+ 0:00 3/10 0.00 97355 1.Kb4 Kxg1 2.Kxb3 g4 3.a5 g3 4.a6 g2 5.a7 Kf1 6.a8=Q g1=Q 7.Qa1+ Kf2 8.Qa7+ Kf1 9.Qa1+ 0:00 3/10 0.39 168927 1.Bb6 Kf3 2.Kb4 Nc1 3.a5 Nd3+ 4.Kb5 Nc1 5.a6 Ne2 6.a7 Nc3+ 7.Kc6 0:01 4/11 0.85 365726 1.Bb6 Kf3 2.Kb4 Na1 3.Kc3 g4 4.Kb2 g3 5.Kxa1 g5 6.a5 0:02 5/12 1.76 702088 1.Bb6 g4 2.Kb4 g3 3.Kxb3 Kf1 4.Kc4 g2 5.Kb5 g5 6.a5 g4 7.a6 0:04 6/13 0.10 1355575 1.Bb6 Kf3 2.Kb4 Ke4 3.Kxb3 Kd5 4.Bc7 Kc6 5.Bh2 Kb7 6.Kc4 0:08 7/14 0.10 2824072 1.Bb6 Kf3 2.Kb4 Ke4 3.Kxb3 Kd5 4.Bc7 Kc6 5.Bh2 Kb7 6.Kc4 0:12 8/15 0.10 4204639 1.Bb6 Kf3 2.Kb4 Ke4 3.Kxb3 Kd5 4.Bc7 Kc6 5.Bh2 Kb7 6.Kc4 0:21 9/16 0.10 7033361 1.Bb6 Kf3 2.Kb4 Ke4 3.Kxb3 Kd5 4.Bc7 Kc6 5.Bh2 Kb7 6.Kc4 0:41 10/17 0.10 13380445 1.Bb6 Kf3 2.Kb4 Ke4 3.Kxb3 Kd5 4.Bc7 Kc6 5.Bh2 Kb7 6.Kc4 1:21 11/18 0.10 26119324 1.Bb6 Kf3 2.Kb4 Ke4 3.Kxb3 Kd5 4.Bc7 Kc6 5.Bh2 Kb7 6.Kc4 2:30 12/19 0.10 47558401 1.Bb6 Kf3 2.Kb4 Ke4 3.Kxb3 Kd5 4.Bc7 Kc6 5.Bh2 Kb7 6.Kc4 jm
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