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Fix trapped rook condition

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A rook is trapped if on rank 1 as is the king.
Currently the condition aloows for the rook
to be also in front of the pawns as long
as king is on first rank.

Verified with short TC test:
LLR: -1.71 (-2.94,2.94)
Total: 23234 W: 4317 L: 4317 D: 14600

Here what it counts is that after 23K games
result is equal.

bench: 4696542
This commit is contained in:
Marco Costalba 2013-05-04 12:18:18 +02:00
parent 3b92159908
commit 9fc77bc414
1 changed files with 1 additions and 1 deletions
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2
src/evaluate.cpp
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@ -651,7 +651,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
bool left = file_of(ksq) < FILE_E;
if ( ((left && file_of(s) < file_of(ksq)) || (!left && file_of(s) > file_of(ksq)))
&& (relative_rank(Us, ksq) == RANK_1 || rank_of(ksq) == rank_of(s))
&& (relative_rank(Us, ksq) == RANK_1 && rank_of(ksq) == rank_of(s))
&& (!ei.pi->has_open_file_on_side(Us, file_of(ksq), left)))
score -= make_score(pos.can_castle(Us) ? (TrappedRookPenalty - mob * 16) / 2
: (TrappedRookPenalty - mob * 16), 0);