Author: John Merlino
Date: 11:46:00 04/15/02
Go up one level in this thread
On April 15, 2002 at 03:35:07, Slater Wold wrote: >[D]2r4k/1p3p1p/1pn2q2/1N1p1p2/8/PP2Q2P/5PP1/2R3K1 w - - 0 26 > >Why in this position is it not perfectly clear that taking the pawn (Qxb6) is >the obvious move? Instead I've noticed several programs wanting Qf4, a4, and >other moves that to me, just seem to waste time. > >I've spoken with one GM, (2550ish) and he agreed that Qxb6 is the only move that >he would emphasize on. (It was a quick discussion, no detail.) > >This is move 26 of game one in the first match between Deep Blue and Kasparov. >Deep Blue played Qxb6 and later won the game. > > > >**I've tested only a few "top commercial" programs. Most want Qf4, a4 and >others at first, and around 1:30 want Qxb6. My question was, why isn't this >obvious from the start?** Chessmaster 9000 likes Qxb6 (on a PIII-600): Time Depth Score Positions Moves 0:00 1/3 0.66 1865 26.Qxb6 Qe7 27.f4 Re8 0:00 1/4 0.70 5479 26.Qxb6 Qe7 27.Rd1 Rd8 28.f4 0:00 2/5 0.62 16660 26.Qxb6 Qe7 27.Rd1 Rd8 28.Qe3 Qe4 0:01 2/6 0.63 62521 26.Qxb6 Rg8 27.Qc5 Qg5 28.g3 Qd2 29.Nd6 0:02 3/7 0.47 174477 26.Qxb6 Rg8 27.Rd1 Qe7 28.Qe3 Qe4 29.Qxe4 dxe4 0:07 3/8 0.47 513849 26.Qxb6 Rg8 27.Qc5 Rd8 28.Re1 d4 29.Qb6 Rd7 30.Re8+ Kg7 0:20 4/9 0.46 1453188 26.Qxb6 Rg8 27.Qc5 Rd8 28.Re1 Kg7 29.Qe3 d4 30.Qg3+ Qg6 31.Qd3 1:09 5/10 0.33 5401909 26.Qxb6 Rg8 27.Qe3 d4 28.Qf4 d3 29.Qd2 Rd8 30.Rc3 Rd5 Additionally, here are the five best moves at the same depth: Time Depth Score Positions Moves 1:54 5/10 0.33 8394156 26.Qxb6 Rg8 27.Qe3 d4 28.Qf4 d3 29.Qd2 Rd8 30.Rc3 Rd5 3:26 5/10 0.27 15336448 26.Kh2 Rg8 27.Qxb6 Qe5+ 28.Kh1 Qb2 29.Qe3 d4 30.Qf4 Rg6 31.Re1 d3 2:41 5/10 0.15 11919920 26.Kh1 f4 27.Qxb6 Qe7 28.Qc5 Qxc5 29.Rxc5 Rd8 30.Kg1 d4 31.Rf5 3:43 5/10 0.08 16626242 26.Rc3 Rd8 27.Qxb6 d4 28.Rc1 Qe7 29.Qc5 Qxc5 30.Rxc5 d3 31.Rxf5 d2 2:20 5/10 0.01 10302798 26.Qf4 Rg8 27.a4 d4 28.Nd6 Rd8 29.Nc4 Na5 30.Nd2 Nc6 31.Ne4 jm
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