Author: Robert Henry Durrett
Date: 04:42:30 07/07/02
Go up one level in this thread
On July 07, 2002 at 02:57:20, Slater Wold wrote: >I guess this could be asked of any chess engine, but in this particular case I >am using Crafty 18.15. > > >I was messing with nullmove in Crafty. Just trying to "trigger" different >responses. (Testing certain theories inside of Crafty to perhaps adapt some of >this into my own "work in progress".) > > >This struck me as odd: > >If I change null_min to 0 and null_max to 2, I get a complete new engine. > >Example: > >null_min = 3 >null_max = 4 > >White(1): setboard r1bqk2r/pp1p1ppp/2nb1n2/2p1p3/Q1P5/2N2NP1/PP1PPPBP/R1B1K2R b >Black(1): go > clearing hash tables > time surplus 0.00 time limit 1:00 (1:00) > nss depth time score variation (1) >starting thread 1 > 6 0.12 0.50 1. ... Qa5 2. Qxa5 Nxa5 3. Nb5 Bb8 > 4. d3 d5 > (2) 6-> 0.14 0.50 1. ... Qa5 2. Qxa5 Nxa5 3. Nb5 Bb8 > 4. d3 d5 > 7 0.17 0.74 1. ... Qa5 2. Qxa5 Nxa5 3. d3 a6 4. > Kd1 Ng4 5. Rf1 > 7 0.28 0.40 1. ... Qe7 2. Nb5 Ng4 3. h3 Nf6 4. > d3 Kf8 5. Nxd6 Qxd6 > 7-> 0.40 0.40 1. ... Qe7 2. Nb5 Ng4 3. h3 Nf6 4. > d3 Kf8 5. Nxd6 Qxd6 > 8 0.65 0.54 1. ... Qe7 2. Nb5 Kf8 3. Kd1 Ng4 4. > Rf1 e4 5. Nxd6 Qxd6 > 8-> 0.98 0.54 1. ... Qe7 2. Nb5 Kf8 3. Kd1 Ng4 4. > Rf1 e4 5. Nxd6 Qxd6 > 9 3.01 0.66 1. ... Qe7 2. Nh4 Nd4 3. Nb5 Nxb5 4. > Qxb5 Ng4 5. Bxb7 Rb8 6. Nf5 Rxb7 7. > Nxe7 Rxb5 8. Nxc8 > 9 7.07 0.64 1. ... Qb6 2. Kd1 h6 3. d3 Kd8 4. Nb5 > Be7 5. Ke1 Ke8 > 9 7.09 0.61 1. ... Be7 2. d3 d6 3. Nd5 Nxd5 4. > cxd5 Qa5+ 5. Qxa5 Nxa5 6. Bd2 b6 7. > Kd1 > 9 8.98 0.53 1. ... Qa5 2. Qxa5 Nxa5 3. Nb5 Bb8 > 4. d3 e4 5. dxe4 Nxc4 6. Ng5 > (4) 9-> 9.21 0.53 1. ... Qa5 2. Qxa5 Nxa5 3. Nb5 Bb8 > 4. d3 e4 5. dxe4 Nxc4 6. Ng5 > (3) 10 9.92 0.82 1. ... Qa5 2. Qxa5 Nxa5 3. d3 Nc6 4. > Nb5 Bb8 <HT> > (2) 10 12.79 0.70 1. ... Qb6 2. Kd1 Qb4 3. Qxb4 cxb4 > 4. Nb5 Bb8 5. d4 Ng4 6. Rf1 Nxd4 7. > Nbxd4 exd4 8. Nxd4 Nxh2 > 10 14.06 0.60 1. ... Qe7 2. Kd1 Kd8 3. Nb5 Ng4 4. > Ke1 Ke8 5. Nh4 Qf6 <HT> > (4) 10-> 17.45 0.60 1. ... Qe7 2. Kd1 Kd8 3. Nb5 Ng4 4. > Ke1 Ke8 5. Nh4 Qf6 <HT> > (3) 11 43.06 0.77 1. ... Qe7 2. Nh4 g6 3. d3 h6 4. Be3 > Ng4 5. Nd5 Qe6 6. Nb6 <HT> > (2) 11 59.79 0.70 1. ... Qb6 2. d3 Qb4 3. Qxb4 cxb4 4. > Nb5 Bb8 5. c5 e4 6. dxe4 Nxe4 7. Be3 > d5 8. cxd6 Bxd6 9. Nxd6+ Nxd6 > time=1:00 cpu=398% mat=0 n=66127556 fh=89% nps=1101k > ext-> chk=1141865 cap=299906 pp=14274 1rep=43053 mate=5394 > predicted=0 nodes=66127556 evals=18755159 > endgame tablebase-> probes done=0 successful=0 > hashing-> trans/ref=15% pawn=94% used=99% > SMP-> split=357 stop=50 data=6/32 cpu=3:59 elap=1:00 > >and > >null_min = 0 >null_max = 2 > >White(1): setboard r1bqk2r/pp1p1ppp/2nb1n2/2p1p3/Q1P5/2N2NP1/PP1PPPBP/R1B1K2R b >KQkq - >Black(1): go > clearing hash tables > time surplus 0.00 time limit 1:00 (1:00) > nss depth time score variation (1) >starting thread 1 > 6 0.13 0.17 1. ... O-O 2. d3 Be7 3. Be3 d5 4. O-O-O > 6-> 0.24 0.17 1. ... O-O 2. d3 Be7 3. Be3 d5 4. O-O-O > 7 0.44 0.04 1. ... O-O 2. d3 Be7 3. Bg5 Ng4 4. > Bxe7 Qxe7 5. Qd1 > 7-> 0.79 0.04 1. ... O-O 2. d3 Be7 3. Bg5 Ng4 4. > Bxe7 Qxe7 5. Qd1 > 8 1.43 0.27 1. ... O-O 2. d3 Bc7 3. e4 Nb4 4. Qd1 > d6 5. O-O > 8-> 3.97 0.27 1. ... O-O 2. d3 Bc7 3. e4 Nb4 4. Qd1 > d6 5. O-O > 9 8.13 0.18 1. ... O-O 2. d3 Be7 3. Bd2 d6 4. O-O-O > Ng4 5. Ne4 Bf5 > 9-> 12.99 0.18 1. ... O-O 2. d3 Be7 3. Bd2 d6 4. O-O-O > Ng4 5. Ne4 Bf5 > 10 20.08 0.31 1. ... O-O 2. d3 Be7 3. Bd2 d5 4. cxd5 > Nxd5 5. Nxe5 Nxe5 6. Nxd5 Re8 7. Nxe7+ > Qxe7 > 10-> 52.21 0.31 1. ... O-O 2. d3 Be7 3. Bd2 d5 4. cxd5 > Nxd5 5. Nxe5 Nxe5 6. Nxd5 Re8 7. Nxe7+ > Qxe7 > time=1:00 cpu=398% mat=0 n=70974629 fh=97% nps=1180k > ext-> chk=1444529 cap=863640 pp=142696 1rep=109480 mate=0 > predicted=0 nodes=70974629 evals=14890017 > endgame tablebase-> probes done=0 successful=0 > hashing-> trans/ref=17% pawn=96% used=99% > SMP-> split=124 stop=15 data=5/32 cpu=3:59 elap=1:00 > > > >From the 1rep to the mate extenstions, it went a _complete_ different route >here. > >I guess my question is, what causes such a huge difference? I realize that your's was a serious question. But I couldn't help but smile at the notion that Bob is surrounded by a bunch of "Crafty Experts." I find that hillarious! :) Bob D.
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