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Subject: Question about repeated positions

Author: Andrea Griffini

Date: 14:13:47 07/15/03


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



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