X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fposition.cpp;h=e2a59e5df3b44eee261e530261a1134bd3ea738f;hp=2d5119389b989c0719c1514dd330ad7ddbeeca81;hb=3b315c9adab141830a81afbdff70c18336763e51;hpb=4d30126e4b0a64c517fb52ec4c24afdc2645663b

diff --git a/src/position.cpp b/src/position.cpp
index 2d511938..e2a59e5d 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -465,6 +465,18 @@ const string Position::pretty(Move m) const {
 }
 
 
+/// Position::game_phase() calculates the game phase of the position
+
+Phase Position::game_phase() const {
+
+  Value npm = st->npMaterial[WHITE] + st->npMaterial[BLACK];
+
+  return  npm >= MidgameLimit ? PHASE_MIDGAME
+        : npm <= EndgameLimit ? PHASE_ENDGAME
+        : Phase(((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit));
+}
+
+
 /// Position::check_blockers() returns a bitboard of all the pieces with color
 /// 'c' that are blocking check on the king with color 'kingColor'. A piece
 /// blocks a check if removing that piece from the board would result in a