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Fix repetition detection bug

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Bug spotted by Jouni Uski and fix suggested by Pablo Vazquez

Also add note that we are not always handling fifty move rule correctly

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2010-02-24 20:13:35 +02:00 • committed by Marco Costalba
parent 1a03f0b0d3
commit e6f2d43b8a
1 changed files with 2 additions and 1 deletions
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3
src/position.cpp
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@ -1678,6 +1678,7 @@ Value Position::compute_non_pawn_material(Color c) const {
/// Position::is_draw() tests whether the position is drawn by material,
/// repetition, or the 50 moves rule. It does not detect stalemates, this
/// must be done by the search.
// FIXME: Currently we are not handling 50 move rule correctly when in check
bool Position::is_draw() const {
@ -1691,7 +1692,7 @@ bool Position::is_draw() const {
return true;
// Draw by repetition?
for (int i = 2; i < Min(Min(gamePly, st->rule50), st->pliesFromNull); i += 2)
for (int i = 4; i <= Min(Min(gamePly, st->rule50), st->pliesFromNull); i += 2)
if (history[gamePly - i] == st->key)
return true;