Author: Bruce Moreland
Date: 01:14:55 11/15/00
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On November 15, 2000 at 02:04:12, Jason Williamson wrote: >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 The rule is that 50 moves must have been made *by each side*, so the CM gui is correct. Imagine if we had a one-move rule instead of a fifty-move rule. White could not claim that 1. Nf3 is drawn by this rule, but after 1. Nf3, black could claim that 1. ... Nf6 does in fact draw by this rule. If 1. e4, black cannot claim that 1. ... Nf6 forces a draw by this rule, but after 1. e4 Nf6, white can claim that 2. Nc3 forces a draw. bruce
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