Author: Ernst A. Heinz
Date: 03:21:36 06/23/98
Go up one level in this thread
On June 23, 1998 at 03:58:26, Ulrich Tuerke wrote: >On June 22, 1998 at 16:11:47, John Stanback wrote: > >>This is a nice position for testing/debugging transposition >>tables and draw by 50 move rule. I modified Zarkov to allow >>it to search beyond 100 plies, but it didn't find the draw. >>Then I added 1 line of code to store positions which were >>scored by the 50 move rule or draw by repetition in the >>transposition table before returning from search(). Now it > >I'm afraid this can imply some problems for the search. Assume >that you have flagged a position as a "draw" in your transposition >table because the 50 move rule had applied. If this position is later >reached at a lower depth via a transposition, then the hash table >would return a "draw". But may be, it really isn't because at lower >depth the search might be still below the 50 move threshold ? >This could result in real foolish moves returned from the t-table. >IMHO, similar remarks hold for the draw by repetition case. > >I think that I had once detected problems through storing these >kinds of positions in the hash table. Now, I don't store them. > >Did I get somehing wrong ? I do not think you got something wrong -- I completely agree with you. =Ernst=
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.