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Stockfish/src
Marco Costalba ec5b9994b5 Index en-passant zobrist keys by file
Instead of by square. This is a more conventional
approach, as reported also in:

http://chessprogramming.wikispaces.com/Zobrist+Hashing

We shrink zobEp[] from 64 to 8 keys at the cost of an extra
'and 7' at runtime to get the file out of the ep square.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
2012-02-19 11:31:36 +01:00
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