Author: Robert Hyatt
Date: 10:56:42 09/06/00
Go up one level in this thread
On September 06, 2000 at 11:18:53, Uri Blass wrote: >On September 06, 2000 at 11:06:16, Robert Hyatt wrote: > >>On September 06, 2000 at 06:14:29, Amir Ban wrote: >> >>>On September 05, 2000 at 10:32:27, Robert Hyatt wrote: >>> >>>>On September 05, 2000 at 01:18:55, Mark Longridge wrote: >>>> >>>>>I was playing crafty the other day and white had a pawn on h7, and a knight on >>>>>g5, black's king is in the corner, and black has only it's king. >>>>> >>>>>There's absolutely no way black can win with just a king, but it STILL REFUSES >>>>>A DRAW request! >>>>> >>>>>It just seemed very odd ;-) >>>> >>>> >>>>It mainly depends on how you have things set up. And even if it is set up >>>>correctly, there are 'rules' that have to be satisfied before it will accept >>>>a draw. IE it has to believe it is a draw. It also has to get a draw score >>>>back from the search for 5 consecutive moves (3 for GM players) before it will >>>>accept or offer a draw. >>>> >>>>Just giving the position doesn't provide enough information... >>>> >>>>The log.nnn file is also needed. >>> >>>The position provides all the relevant information. >>> >>>It's your problem, not the opponent's to make sure your program behaves >>>reasonably. >>> >>>Asking the opponent to provide internal crafty parameters and logs is not >>>reasonable. >>> >>>Amir >> >> >>Your assumptions are wrong. The default setup _will_ offer draws. But it is >>possible that the user has disabled this and not remembered. The position >>doesn't say a thing, because of the rules I gave. Crafty has to find a draw >>score 5 moves in a row to offer a draw. The current search eval has to be >><= drawscore for it to accept a draw, and it won't accept a draw at all during >>the first 30-40 moves of the game. Based on that, I can't look at a position >>and say whether it should have accepted a draw offer there or not... It might >>have accepted after 4 more moves... who knows without seeing what went on in >>the _game_... > >This is a logical explanation for the fact that crafty did not agree to a draw >but better rules should tell it always to accept a draw if it has only a king. > >Uri It should, unless it has been disabled by the user. I can't see any way to reach a king only position without crafty seeing it in the search a few moves ahead of time.
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