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Move draw by material check

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It is more natural to test this case among
others material distributions.

No functional change.
This commit is contained in:
Marco Costalba
2013-09-08 05:49:04 -07:00
parent 0515ad0fb0
commit 490f67a3f8
3 changed files with 17 additions and 13 deletions
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13
src/position.cpp
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@@ -1223,6 +1223,7 @@ Key Position::compute_material_key() const {
/// game and the endgame. These functions are used to initialize the incremental
/// scores when a new position is set up, and to verify that the scores are correctly
/// updated by do_move and undo_move when the program is running in debug mode.
Score Position::compute_psq_score() const {
Score score = SCORE_ZERO;
@@ -1254,15 +1255,11 @@ 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.
bool Position::is_draw() const {
/// Position::is_draw() tests whether the position is drawn by repetition
/// or the 50 moves rule. It does not detect stalemates, this must be done
/// by the search.
// Draw by material?
if ( !pieces(PAWN)
&& (non_pawn_material(WHITE) + non_pawn_material(BLACK) <= BishopValueMg))
return true;
bool Position::is_draw() const {
// Draw by the 50 moves rule?
if (st->rule50 > 99 && (!checkers() || MoveList<LEGAL>(*this).size()))