Author: Robert Hyatt
Date: 16:59:42 11/22/00
Go up one level in this thread
On November 22, 2000 at 16:45:40, Jarkko Pesonen wrote: >In position >setboard 2r2rk1/1p1bq3/p3p2p/3pPpp1/1P1Q4/P7/2P2PPP/2R1RBK1 b > >What is the reason that move Bb5 is found in analysis at depth 14 >but when search Bb5 forced you get better move score at depth 11 I have answered this before. "analysis mode" and "game mode" are two different things. In "game mode" crafty has some asymmetry that I think makes it play better chess. But in analysis mode, this asymmetry can be confusing as it might say +.3 for white, then when you change sides it might say +.2 for black, which would seem inconsistent... _if_ you didn't know about the asymmetry. In analysis mode, most of the asymmetry is turned off... And that certainly affects some positions as you saw... > >Crafty 17.14 >Hash 4M >Hashp 1M >Is this because of the move ordering, alpha-beta or what? > > > 6-> 1.59 -0.76 1. ... Rc7 2. f3 Rfc8 3. Bd3 Rc3 4. > Ra1 > 7-> 3.03 -0.76 1. ... Rc7 2. f3 Rfc8 3. Bd3 Rc3 4. > Ra1 R8c7 > 8-> 4.90 -0.66 1. ... Rc7 2. f3 Rfc8 3. c3 a5 4. Bd3 > axb4 5. axb4 Ra8 > 9-> 10.97 -0.66 1. ... Rc7 2. f3 Rfc8 3. c3 Ba4 4. > Bd3 Bb3 5. Re2 Bc4 6. Bxc4 Rxc4 > 10 15.99 -0.69 1. ... Rc7 2. f3 Rfc8 3. c3 Ba4 4. > Bd3 Bb3 5. Re2 Bc4 6. Rd1 > 10 48.20 -0.65 1. ... Ba4 2. c3 g4 3. c4 Qg5 4. Rc3 > Rfd8 5. Qb6 Bc6 6. Qc5 dxc4 7. Bxc4 > 10-> 54.88 -0.65 1. ... Ba4 2. c3 g4 3. c4 Qg5 4. Rc3 > Rfd8 5. Qb6 Bc6 6. Qc5 dxc4 7. Bxc4 > 11-> 2:58 -0.69 1. ... Ba4 2. c3 g4 3. c4 Bb3 4. c5 > Ba4 5. Bd3 Qc7 6. Re3 Bb3 > 12-> 5:18 -0.65 1. ... Ba4 2. c3 Bb3 3. f3 Rc6 4. Re3 > Rfc8 5. Be2 b5 6. Bd3 Qc7 7. Be2 > 13-> 9:40 -0.47 1. ... Ba4 2. c3 Bb5 3. Bxb5 axb5 4. > Qe3 Rc4 5. Qh3 Kg7 6. Qg3 Re4 7. Rf1 > f4 8. Qd3 Rxe5 9. Qxb5 > 14 17:29 -0.52 1. ... Ba4 2. c4 dxc4 3. Bxc4 Rfd8 > 4. Qe3 Kg7 5. Bd3 Qd7 6. Be2 Bc2 7. > Bf3 Kg8 8. h3 Bd3 9. Rxc8 Rxc8 > 14 30:45 -0.22 1. ... Bb5 2. Bxb5 axb5 3. Qe3 Rc4 > 4. Qh3 Qg7 5. Qd3 Rfc8 6. Re2 Re4 7. > Qxb5 Ra8 8. Rd2 Qxe5 9. Qxb7 Rxa3 > 14-> 31:05 -0.22 1. ... Bb5 2. Bxb5 axb5 3. Qe3 Rc4 > 4. Qh3 Qg7 5. Qd3 Rfc8 6. Re2 Re4 7. > Qxb5 Ra8 8. Rd2 Qxe5 9. Qxb7 Rxa3 > 15-> 54:22 -0.15 1. ... Bb5 2. Bxb5 axb5 3. Qe3 Rc4 > 4. Qh3 Kg7 5. Qd3 Qd7 6. Re2 Qc6 7. > f3 Rc3 8. Qd2 Ra8 9. h4 gxh4 >Forced Bb5 search: > > > 9-> 2.11 -0.90 1. ... Bb5 2. Bxb5 axb5 3. f3 Rc4 4. > Qd2 Rfc8 5. Re3 Qc7 6. Re2 > 10-> 4.13 -0.87 1. ... Bb5 2. Bxb5 axb5 3. f3 Rc4 4. > Qd2 Rfc8 5. Re3 Qc7 6. Re2 Rf4 > 11-> 28.61 -0.48 1. ... Bb5 2. Bxb5 axb5 3. f3 Rc4 4. > Qa7 g4 5. Qe3 gxf3 6. Qxf3 Re4 7. Kf1 > Qg7 > 12-> 1:07 -0.42 1. ... Bb5 2. Bxb5 axb5 3. Qe3 Rc4 > 4. Qh3 Kg7 5. Qd3 Rfc8 6. h3 Rc3 7. > Qe2 Rxa3 8. Qxb5 > 13-> 3:02 -0.34 1. ... Bb5 2. Bxb5 axb5 3. Qe3 Rc4 > 4. Qh3 Rfc8 5. Re2 Qg7 6. Qd3 Rc3 7. > Qxb5 Rxa3 8. f3 > 14-> 10:09 -0.16 1. ... Bb5 2. Bxb5 axb5 3. Qe3 Rc4 > 4. Qh3 Kg7 5. Qd3 Rfc8 6. Re2 Rc3 7. > Qxb5 Rxa3 8. f3 Ra2 > 15-> 22:59 -0.15 1. ... Bb5 2. Bxb5 axb5 3. Qe3 Rc4 > 4. Qh3 Kg7 5. Qd3 Qd7 6. f3 Qc6 7. > Re2 Rc3 8. Qd2 Ra8 9. h4 gxh4 > 16-> 98:10 -0.02 1. ... Bb5 2. Bxb5 axb5 3. Qe3 Rc4 > 4. Qh3 Kg7 5. Qb3 Ra8 6. h3 Qc7 7. > Qd3 Re4 8. f3 Rxe1+ 9. Rxe1 Qc4 10. > Rd1 Kg6 > > >Another question about INCPLY 60 define in chess.h >Can 60 be changed to some other value without destroying the search totally i.e. >is some modification needed to make work reasonably. Is the value 60 >educated guess, result of years of work, or can any value work? > >40 seem to make it faster to move to another ply level >100 makes it almost stall. > >If you compile crafty with INCPLY 100 is search more precise? > >It has been fun playing around with your code. > >Jarkko
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.