Author: paul bedrey
Date: 12:46:26 12/16/04
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On December 16, 2004 at 14:19:01, John Merlino wrote: >On December 16, 2004 at 13:50:26, paul bedrey wrote: > >>Looking through a game between Shredder 8 and Junior 9 posted by Thomas Logan I >>came upon this critical point in the game: >> >>[D]5rk1/6q1/4r2p/1BPp1R2/P2Pn3/3Q2p1/4R1P1/6K1 w - - 0 43 >> >>The game was roughly even up to move 43. >>Shredder 8 took the pawn at D5 and lost the game! How many other programs fall >>for this? Gambit Tiger immediately recognizes the mistake. > >CM9_SKR on a P4-2.4 needs 0:42 to see that Rxd5 is bad: > >Time Depth Score Positions Moves >0:00 1/5 1.36 21345 43.Rxf8+ Kxf8 44.a5 Rf6 45.a6 Qf7 > 46.Rxe4 dxe4 47.Qxg3 >0:00 1/5 1.38 32163 43.Rxd5 Qf7 44.Rc2 Nxc5 45.Qxg3+ > Rg6 46.Qxg6+ Qxg6 47.Rdxc5 >0:00 1/6 1.60 77356 43.Rxd5 Qf7 44.Rc2 Kh8 45.a5 Qf4 > 46.Rd7 >0:01 1/7 1.25 272846 43.Rxd5 Qf7 44.Rc2 Qf4 45.Qf3 Nd2 > 46.Rxd2 Qxd2 47.Qxg3+ Kh8 >0:02 1/7 1.29 383923 43.Rxf8+ Qxf8 44.Bd7 Re7 45.c6 > Qf4 46.Qf3 Qc1+ 47.Qf1 >0:04 1/8 1.24 796172 43.Rxf8+ Kxf8 44.Re1 Rf6 45.a5 > Qc7 46.a6 Qf4 47.Qf3 Qxf3 48.gxf3 > Rxf3 >0:13 2/9 0.94 2678196 43.Rxf8+ Kxf8 44.Re3 Ke7 45.c6 > Kd8 46.Rf3 Rf6 47.Qe3 Rxf3 48.gxf3 >0:19 2/9 1.00 3784746 43.Rxd5 Qg4 44.Bc4 Qh4 45.Rh5 Qxh5 > 46.Bxe6+ Kh8 47.Bh3 Nf2 48.Qe3 > Nxh3+ 49.gxh3 Qxh3 50.Qe5+ Kg8 >0:36 2/10 -0.65 7450836 43.Rxd5 Qf7 44.Rc2 Qf4 45.Bd7 Ref6 > 46.Rf5 Rxf5 47.Bxf5 Rxf5 48.a5 > Nc3 49.a6 >0:42 2/10 1.03 8671485 43.Rxf8+ Kxf8 44.Re3 Ke7 45.c6 > Kd8 46.Rf3 Kc7 47.Qe3 Rf6 48.Rxf6 > Qxf6 >0:57 2/11 1.02 11658496 43.Rxf8+ Kxf8 44.Re3 Ke7 45.c6 > Kd8 46.Rf3 h5 47.Rf5 Nd6 48.Rf1 Rf6 >2:15 3/12 0.63 27768611 43.Rxf8+ Kxf8 44.Qe3 Kg8 45.c6 > Qf7 46.Qf3 Rf6 47.Qg4+ Kf8 48.Rb2 > Rf2 49.Qc8+ Kg7 50.Be2 Ng5 > >jm Looks like the King SKR switchs back at 19 sec and finally goes for the correct answer at 42 sec. I don't have Shredder 8 but I do have 7.04 and it flip flops from Rxf8 back to Rxd5 and holds it for 6 minutes before realizing its bad. I've tried it with other engines and it does not look like its that tough to solve.
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