Author: blass uri
Date: 01:17:18 02/09/99
Go up one level in this thread
On February 08, 1999 at 16:25:33, Robert Hyatt wrote: >On February 08, 1999 at 11:18:50, José de Jesús García Ruvalcaba wrote: > >>On February 07, 1999 at 18:30:17, Robert Hyatt wrote: >> >> I see that crafty would never give up the h-pawn to reach a drawn QP vs Q >>ending. So I assume that the position after 96. Qxh5+ is won for black. >> I do not understand why, in a tablebase position, crafty allowed the same >>position to appear twice (however, I understand why it allowed the third >>repetition now). If crafty is in a won tablebase position, the distance to mate >>should decrease every move. >> > >that was the 'bug' I reported. in my search, I tried all moves at ply=1, >but at ply=2 did the tablebase probe _before_ trying any opponent moves. And >since I did this, I made a move that led to the shortest possible mate, but >also led to a position where when the opponent moved, it repeated the position >for the third time. I did not understand it. If you are in a won position then it is enough to look only at all moves at ply=1 and to choose the best move(shortest distance to mate). If the distance to mate is decreased every move then repetition is impossible because repetition of distance to mate is impossible. Uri
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.