From: Marco Costalba <mcostalba@gmail.com>
Date: Wed, 20 Feb 2013 11:19:19 +0000 (+0100)
Subject: Merge Gary's bishop_pin patch
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=9a1d5f0f1d8a12a85b198688d4f1d636a146eb7a;hp=9a1d5f0f1d8a12a85b198688d4f1d636a146eb7a

Merge Gary's bishop_pin patch

Give a bonus if a bishop can pin a piece or can
give a discovered check through an x-ray attack.

Seems good after 24000 games at 15"+0.05 (single thread):

ELO: 12.30 +- 99%: 5.79 95%: 4.40 LOS: 100.00%
Total: 24000 W: 4931 L: 4082 D: 14987

bench: 4917064
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