Author: Jason Williamson
Date: 23:04:12 11/14/00
In the 2nd game I ran with xboard engines under CM8000 a serious misinterpratation of the 50 move rule was uncovered. The ending in particular was a drawn Rook and Bishop verus Bishop ending. After the 50th move with the move of a pawn or capture of a piece by white, black (Zchess 2.22) claimed the draw and according to its log quit. The problem is, the CM8000 gui doesn't know how to do the 50 move rule. What it seems to think is that the draw is after the 50th move SET, ie white AND black, which is clearly wrong. To test this theory out, I moved knights and rooks around from the starting position for 50 moves. Since no pawn was moved, nor anything was captured, the 50 move that this happens would be white 50 (0+50=50) but the GUI only claims the draw after the black 50th move. Anyway, this would basicly break any and all winboard engines that are coded correctly and this bug would be a frequent vistor to engine vs engine matches. So, how long until the patch. :) Cheers. JW
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