Author: Tanya Deborah
Date: 01:28:35 04/15/02
Go up one level in this thread
On April 15, 2002 at 03:39:35, Slater Wold wrote: >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?** > > >Actually, I found a program that's it IS pretty obvious to; Crafty 17.7! > Hello Slater! I see that you like so much 17.7 version of Crafty. Is this version the strongest for you, or it has something special? > clearing hash tables > time surplus 0.00 time limit 1:00 (1:00) > nss depth time score variation (1) > 7 0.23 0.60 1. Qxb6 Qe7 2. Qc5 Qxc5 3. Rxc5 Rd8 > 4. Nc7 Ne7 > 7-> 0.30 0.60 1. Qxb6 Qe7 2. Qc5 Qxc5 3. Rxc5 Rd8 > 4. Nc7 Ne7 > 8 0.52 0.70 1. Qxb6 Qe7 2. Qc5 Qxc5 3. Rxc5 Rd8 > 4. Nc7 Ne7 5. Kh2 > 8-> 0.67 0.70 1. Qxb6 Qe7 2. Qc5 Qxc5 3. Rxc5 Rd8 > 4. Nc7 Ne7 5. Kh2 > 9 2.91 0.49 1. Qxb6 Rg8 2. Qc5 Qg5 3. g3 f4 4. > Nd6 Ne5 5. Qxd5 <HT> > 9-> 3.37 0.49 1. Qxb6 Rg8 2. Qc5 Qg5 3. g3 f4 4. > Nd6 Ne5 5. Qxd5 <HT> > 10 4.90 0.49 1. Qxb6 Rg8 2. Qc5 Qg5 3. g3 f4 4. > Nd6 Ne5 5. Qxd5 fxg3 > 10-> 8.60 0.49 1. Qxb6 Rg8 2. Qc5 Qg5 3. g3 f4 4. > Nd6 Ne5 5. Qxd5 fxg3 > 11 13.49 0.45 1. Qxb6 Rg8 2. Qc5 f4 3. Nd6 f3 4. > g3 Nd4 5. Re1 Rxg3+ 6. fxg3 f2+ 7. > Kf1 fxe1=Q+ 8. Kxe1 > 11-> 21.64 0.45 1. Qxb6 Rg8 2. Qc5 f4 3. Nd6 f3 4. > g3 Nd4 5. Re1 Rxg3+ 6. fxg3 f2+ 7. > Kf1 fxe1=Q+ 8. Kxe1 > 12 38.86 0.35 1. Qxb6 Rg8 2. Qe3 f4 3. Qf3 Qe5 4. > Rc5 Rd8 5. Kh2 Rd7 6. Kg1 <HT> > time=1:00 cpu=99% mat=-1 n=46245754 fh=91% nps=766165 > ext-> checks=1900898 recaps=106933 pawns=15636 1rep=257959 thrt:14 >995 > predicted=0 nodes=46245754 evals=9694671 > endgame tablebase-> probes done=0 successful=0 > hashing-> trans/ref=30% pawn=99% used=88% > > >However, I cannot see the first 6 ply.
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