From: Marco Costalba <mcostalba@gmail.com>
Date: Fri, 30 Aug 2013 14:40:11 +0000 (+0200)
Subject: Fix a bogus assert in allows()
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;ds=sidebyside;h=3e4dcaa06e7fd555628f1c3a65f4b7967d9708cd;hp=3e4dcaa06e7fd555628f1c3a65f4b7967d9708cd;p=stockfish

Fix a bogus assert in allows()

Becuase castle is coded as "king captures the rook"
the to_sq(move), A1/8 or H1/8 is empty after the move,
leading to assert assert(p != NO_PIECE) in color_of().

Teach allows() asserts about castle and fix the crash.

Bug reported by Ryan Takker and tracked down by Tom Vijlbrief.

No functional change.
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