Author: John Stanback
Date: 13:59:43 09/11/99
Go up one level in this thread
On September 11, 1999 at 16:21:53, James Robertson wrote: >Today in a game with blik on FICS, my program reached the following position: > >2r1r1k1/3p1p1p/p2Qp1p1/q1N2P2/Pn1B1P2/6P1/2P3bP/2KRR3 b - - > >After about 3 seconds my program played ... Bf3?? which loses to Qe5. I ran my >program on the position after the game it only then did it realise that ... >Na2+! wins (and wins big). > >It takes it 9.5 seconds to realise that, a little too slow for the game. Crafty >16.16 takes about 20 seconds to find ... Na2 (in the meantime it plays ... Rb8 >which it says wins material) on the same hardware (P233, 4MB hash table). > >Anyway, here is my program's output. What does your program say about the >position? > >Depth Score Time Nodes PV > 1 -30 0 191 Qc7 Qxc7 Rxc7 fxe6 fxe6 > 2 -30 0 1130 Qc7 Qxc7 Rxc7 fxe6 fxe6 > 3 6 50 5768 Bf3 fxg6 Bxd1 Rxd1 hxg6 Qxd7 > 4 19 220 22509 Bc6 Nxd7 Bxd7 Qxd7 Rxc2+ Kb1 > 5> 70 660 66198 exf5 Rxe8+ Rxe8 Qxd7 Bc6 Qd6 Bxa4 > 5 70 770 78189 exf5 Rxe8+ Rxe8 Qxd7 Bc6 Qd6 Bxa4 > 6> 21 2800 301776 Bf3 Qe5 Na2+ Kb1 f6 Qxf6 Bxd1 Rxd1 > 6 21 3620 392090 Bf3 Qe5 Na2+ Kb1 f6 Qxf6 Bxd1 Rxd1 > 7> 168 9550 1062091 Na2+ Kb2 Qb4+ Kxa2 Bd5+ c4 Qxc4+ Kb1 Rb8+ > Bb2 Qa2+ Kc1 Qxb2+ > 7 168 9830 1099308 Na2+ Kb2 Qb4+ Kxa2 Bd5+ c4 Qxc4+ Kb1 Rb8+ > Bb2 Qa2+ Kc1 Qxb2+ > 8 260 12190 1392528 Na2+ Kb2 Qb4+ Kxa2 Bd5+ c4 Qxc4+ Kb1 Rb8+ > Bb2 Qa2+ Kc2 Qxb2+ Kd3 Qxh2 fxg6 fxg6 > 9 260 16260 1938555 Na2+ Kb2 Qb4+ Kxa2 Bd5+ c4 Qxc4+ Kb1 Rb8+ > Bb2 Qa2+ Kc2 Qxb2+ Kd3 Qxh2 fxg6 fxg6 > 10 390 31250 3854123 Na2+ Kb2 Qb4+ Kxa2 Bd5+ Qxd5 exd5 c3 Qc4+ > Ka3 d6 Nb3 Rxe1 Rxe1 gxf5 > 11 392 56680 7268592 Na2+ Kb2 Qb4+ Kxa2 Bd5+ Qxd5 exd5 c3 Qc4+ > Ka3 Re2 Nb3 Rxh2 fxg6 hxg6 Re7 Here is Zarkov's output (K6-333) 00:01.0 26496 4> 111 Bf3 fxg6 Na2+ Kb1 Bxd1 Rxd1 00:01.5 46210 5> 111 Bf3 fxg6 Na2+ Kb1 Bxd1 Rxd1 00:01.9 66432 5 48 Bf3 fxg6 Na2+ Kb1 Bxd1 Rxd1 00:02.6 97152 5 82 Rc6 Qe5 f6 Qe2 Rb8 Kb1 00:05.0 195712 5 97 Rb8 Kd2 Nd5+ Ke2 Nc3+ Kf2 Nxd1+ Rxd1 Bc6 fxg6 00:06.8 269847 5 174 Na2+ Kb2 Qb4+ Kxa2 Bd5+ c4 Bxc4+ Ka1 Bb3 Nxb3 00:07.1 283805 5 264 Na2+ Kb1 Qb4+ Kxa2 Bd5+ Qxd5 exd5 Rxe8+ Rxe8 00:07.8 317056 5 353 Na2+ Kb1 Qb4+ Kxa2 Bd5+ Qxd5 exd5 Rxe8+ Rxe8 fxg6 00:07.9 321135 6> 353 Na2+ Kb1 Qb4+ Kxa2 Bd5+ Qxd5 exd5 Rxe8+ Rxe8 fxg6 00:09.2 393344 6 353 Na2+ Kb1 Qb4+ Kxa2 Bd5+ Qxd5 exd5 Rxe8+ Rxe8 fxg6 00:10.4 453970 7> 353 Na2+ Kb1 Qb4+ Kxa2 Bd5+ Qxd5 exd5 Rxe8+ Rxe8 fxg6 00:13.8 643072 7 366 Na2+ Kb1 Qb4+ Kxa2 Bd5+ Qxd5 exd5 Rxe8+ Rxe8 fxg6 00:18.4 883603 8> 366 Na2+ Kb1 Qb4+ Kxa2 Bd5+ Qxd5 exd5 Rxe8+ Rxe8 fxg6 00:30.1 1523584 8 420 Na2+ Kb1 Qb4+ Kxa2 Bd5+ Qxd5 exd5 c3 Qc4+ Ka3 00:43.5 2247844 9> 420 Na2+ Kb1 Qb4+ Kxa2 Bd5+ Qxd5 exd5 c3 Qc4+ Ka3 01:20.9 4207104 9 420 Na2+ Kb1 Qb4+ Kxa2 Bd5+ Qxd5 exd5 c3 Qc4+ Ka3 It takes 6.8 seconds to find Na2+. John
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