Move draw by material check

[stockfish] / src / position.cpp

diff --git a/src/position.cpp b/src/position.cpp
index 615763cdcf93007a3e09b42d8a2f8727e31f19c7..6885b135cafad835c691087a336ba9d66708228e 100644 (file)
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -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.
 /// 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;
 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()))
 
   // Draw by the 50 moves rule?
   if (st->rule50 > 99 && (!checkers() || MoveList<LEGAL>(*this).size()))