X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;h=34a87771aea96a120e14f5858ffebd510f73d60f;hp=be53a73ee886633bc7775c3453856a50531e78e6;hb=a9e93fa6a56d985e98f16a480a8b0d166fdea324;hpb=d3ffd0ffcad5e467fffd67d82d031fa1cbdba7d2
diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index be53a73e..34a87771 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -17,10 +17,10 @@
along with this program. If not, see .
*/
+#include
#include
#include
#include
-#include
#include "bitcount.h"
#include "evaluate.h"
@@ -787,11 +787,18 @@ namespace {
sf = ScaleFactor(50 * sf / SCALE_FACTOR_NORMAL);
}
+ // Stealmate detection
+ Color stm = pos.side_to_move();
+ if ( (ei.attackedBy[stm][ALL_PIECES] == ei.attackedBy[stm][KING])
+ && (!(ei.attackedBy[stm][KING] & ~ei.attackedBy[~stm][ALL_PIECES]))
+ && !MoveList(pos).size())
+ sf = SCALE_FACTOR_DRAW;
+
// Interpolate between a middlegame and a (scaled by 'sf') endgame score
Value v = mg_value(score) * int(ei.mi->game_phase())
+ eg_value(score) * int(PHASE_MIDGAME - ei.mi->game_phase()) * sf / SCALE_FACTOR_NORMAL;
- v /= PHASE_MIDGAME;
+ v /= int(PHASE_MIDGAME);
// In case of tracing add all single evaluation contributions for both white and black
if (Trace)