Author: Dann Corbit
Date: 15:09:37 07/14/99
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From: http://www.clark.net/pub/pribut/chessfaq.html We have: Subject: [24] Trivia How long is the longest possible chess game? The basic idea is a player may claim a draw if fifty moves elapse without a capture or a pawn advance. Ignoring the special cases where more than 50 moves are allowed by the rules, the answer is after Black's 5948th move, White is able to claim a draw. The simple calculation is (<Pawn_moves + - + <Drawing_interval_grace_period) * <Drawing_interval, or (16*6 + 30 - 8 + 1) * 50 = 5950; we're able to trim two moves from this total by observing that sequences of Captures/Pawn_moves must have (at least) 4 alternations between the two players. So no chess program need handle games longer than 5948 moves.
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