Author: Frank Phillips
Date: 14:30:14 07/15/03
Go up one level in this thread
On July 15, 2003 at 17:13:47, Andrea Griffini wrote:
>A question about repeated positions... is the en-passant square
>part of the "position" even when no en-passant pawn capture is
>possible (because there is no capturing pawn, or because the
>theoretically capturing pawn is pinned on the file or because
>just the en-passant capture is "pinned") ?
>
>If this is not the case then checking for repeated positions
>gets way more annoying as my position hash code doesn't tell
>the whole story ... :(
>
>More concretely:
>
>8/8/8/8/1R4pk/8/5P2/5K2 w - - 0 1
>
>1. f4 Kh3 2. Ra4 Kh4 3. Rb4 Kh3 4. Ra4 Kh4 5. Rb4
>
>Is this "5. Rb4" drawing by third repetition of the position
>occured on the board after "1. f4" or not ?
>
>Andrea
FIDE Laws 1997
9.2. The game is drawn, upon a correct claim by the player having the move, when
the same position, for at least the third time (not necessarily by repetition of
moves)
(a) is about to appear, if he first writes his move on his scoresheet and
declares to the arbiter his intention to make this move, or
(b) has just appeared.
Positions as in (a) and (b) are considered the same, if the same player has
the move, pieces of the same kind and colour occupy the same squares, and the
possible moves of all the pieces of both players are the same. Positions are not
the same if a pawn could have been captured en passant or if the right to castle
immediately or in the future has been changed.
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