Author: Bryan Hofmann
Date: 10:18:36 07/19/04
Go up one level in this thread
On July 19, 2004 at 12:44:04, Uri Blass wrote: >Crafty has antisymmetric evaluation so how can it learn from white about black? > >I learned from the winboard forum that Crafty can learn from a game that it lost >with white about moves to play in black. > >When does it learn to do it?(only if the relevant position is one ply after it's >move or also later) and how it goes with Crafty antisimmetric evaluation. > >Suppose that Crafty is white and the opponent chose to close the position with >black and won the game and Crafty had negative score against itself because it >dislike closed positions. > >Does it mean that in future game when Crafty is black it is going to learn that >the line of the opponent was good based on it's score and it is going to close >the position. > >Uri This is what I posted on the winboard forum; Actually the position learning is much more powerful then just learn of position not to repeat. Take for example the following position; rnbqk2r/1p3ppp/p7/1NpPp3/QPP1P1n1/P4N2/4KbPP/R1B2B1R b - - Crafty will make the move of Nd7 6 0.13 0.33 1. ... Nd7 2. Nd6+ Kf8 3. Ng5 Nb6 4. Ndxf7 Qf6 6-> 0.24 0.33 1. ... Nd7 2. Nd6+ Kf8 3. Ng5 Nb6 4. Ndxf7 Qf6 7 0.25 -1 1. ... Nd7 7 0.33 1.57 1. ... Nd7 2. Nd6+ Kf8 3. Nxc8 b5 4. cxb5 Qxc8 5. bxa6 Rxa6 7-> 0.84 1.57 1. ... Nd7 2. Nd6+ Kf8 3. Nxc8 b5 4. cxb5 Qxc8 5. bxa6 Rxa6 8 1.00 1.71 1. ... Nd7 2. Nd6+ Kf8 3. Nxc8 Ndf6 4. Qc2 Nh5 5. Nxe5 Nxe5 6. Kxf2 Rxc8 8-> 1.81 1.71 1. ... Nd7 2. Nd6+ Kf8 3. Nxc8 Ndf6 4. Qc2 Nh5 5. Nxe5 Nxe5 6. Kxf2 Rxc8 9 2.24 1.70 1. ... Nd7 2. Nd6+ Kf8 3. Nxc8 Ndf6 4. Qc2 cxb4 5. axb4 Nh5 6. Nxe5 Nxe5 7. Kxf2 Rxc8 9-> 5.45 1.70 1. ... Nd7 2. Nd6+ Kf8 3. Nxc8 Ndf6 4. Qc2 cxb4 5. axb4 Nh5 6. Nxe5 Nxe5 7. Kxf2 Rxc8 10 8.81 1.67 1. ... Nd7 2. d6 axb5 3. Qxa8 Nb6 4. Qa5 Qxd6 5. h3 Bd4 6. Nxd4 Qxd4 7. Qxb5+ 10-> 13.11 1.67 1. ... Nd7 2. d6 axb5 3. Qxa8 Nb6 4. Qa5 Qxd6 5. h3 Bd4 6. Nxd4 Qxd4 7. Qxb5+ 11 21.67 1.50 1. ... Nd7 2. Nd6+ Kf8 3. Ng5 Nb6 4. Ndxf7 Nxa4 5. Nxd8 cxb4 6. axb4 Nb6 7. Ndf7 Rg8 But if I force it to learn that the following position is bad for white; setb rnbqk2r/1p3ppp/8/1ppPp3/QPP1P1n1/P4N2/4KbPP/R1B2B1R w - - store -32 Crafty will now make the move of axb5 instantly; 11-> 0.63 -32.00 1. ... axb5 12 0.63 -32.00 1. ... axb5 12-> 1.39 -32.00 1. ... axb5 13 1.39 -32.00 1. ... axb5
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.