Author: Jan K.
Date: 13:19:55 11/17/04
Go up one level in this thread
On November 17, 2004 at 16:02:32, Robert Hyatt wrote: >On November 17, 2004 at 14:04:06, Uri Blass wrote: > >>On November 17, 2004 at 13:35:16, Robert Hyatt wrote: >> >>>On November 17, 2004 at 08:39:40, milix wrote: >>> >>>>On November 17, 2004 at 08:27:47, Jan K. wrote: >>>> >>>>>Under winboard/arena which of the following positions should be claimed(/can be >>>>>claimed) as drawn by insufficient material-KBKN, KBKNN, KNNKNN? I thought that >>>>>KBKN can be claimed as a draw, but once this position happened under Fritz GUI, >>>>>my engine claimed draw and stopped playing but GUI still expected me to move and >>>>>my engine lost on time. Thx. >>>> >>>>[D] knB5/8/1K6/8/8/8/8/8 w - - 0 1 >>>> >>>>White to move and mate in one - so this position is not a draw. The king is in >>>>the wrong corner. >>> >>> >>>Fine, but what was black's last move? >>> >>>Had to be the knight. Which could only have come from a6 or c6 otherwise it >>>would have captured the white king. Therefore there was a forced draw one move >>>earlier, where black left the knight on a6/c6 and moved his king instead. >>> >>>It's a draw. >> >>It is not a draw by insufficient material. >>A program may evaluate it as 0.00 but not stop moving. >> >>Uri > >It is a draw by insufficient material so far as I can see. The definition of >"insufficient material to force checkmate" seems pretty clear. Neither side can >_force_ checkmate here. Checkmate cannot be forced there, but is this really the right definition of 'draw by insufficient material'? This is from (maybe outdated) FIDE chess rules I found: 9.6. The game is drawn when a position is reached from which a checkmate cannot occur by any possible series of legal moves, even with the most unskilled play. This immediately ends the game.
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