diff --git a/src/material.cpp b/src/material.cpp
index 114f0831..d67b95ca 100644
--- a/src/material.cpp
+++ b/src/material.cpp
@@ -60,8 +60,8 @@ namespace {
 
   // QueenMinorsImbalance[opp_minor_count] is applied when only one side has a queen.
   // It contains a bonus/malus for the side with the queen.
-  const int QueenMinorsImbalance[16] = { 
-    31, -8, -15, -25, -5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+  const int QueenMinorsImbalance[13] = {
+    31, -8, -15, -25, -5
   };
 
   // Endgame evaluation and scaling functions are accessed directly and not through
@@ -144,7 +144,13 @@ Entry* probe(const Position& pos) {
   std::memset(e, 0, sizeof(Entry));
   e->key = key;
   e->factor[WHITE] = e->factor[BLACK] = (uint8_t)SCALE_FACTOR_NORMAL;
-  e->gamePhase = pos.game_phase();
+
+  Value npm_w = pos.non_pawn_material(WHITE);
+  Value npm_b = pos.non_pawn_material(BLACK);
+  Value npm = std::max(EndgameLimit, std::min(npm_w + npm_b, MidgameLimit));
+
+  // Map total non-pawn material into [PHASE_ENDGAME, PHASE_MIDGAME]
+  e->gamePhase = Phase(((npm - EndgameLimit) * PHASE_MIDGAME) / (MidgameLimit - EndgameLimit));
 
   // Let's look if we have a specialized evaluation function for this particular
   // material configuration. Firstly we look for a fixed configuration one, then
@@ -181,9 +187,6 @@ Entry* probe(const Position& pos) {
         e->scalingFunction[c] = &ScaleKQKRPs[c];
   }
 
-  Value npm_w = pos.non_pawn_material(WHITE);
-  Value npm_b = pos.non_pawn_material(BLACK);
-
   if (npm_w + npm_b == VALUE_ZERO && pos.pieces(PAWN)) // Only pawns on the board
   {
       if (!pos.count<PAWN>(BLACK))
diff --git a/src/position.cpp b/src/position.cpp
index 5df07a09..49935904 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -450,19 +450,6 @@ const string Position::fen() const {
 }
 
 
-/// Position::game_phase() calculates the game phase interpolating total non-pawn
-/// material between endgame and midgame limits.
-
-Phase Position::game_phase() const {
-
-  Value npm = st->nonPawnMaterial[WHITE] + st->nonPawnMaterial[BLACK];
-
-  npm = std::max(EndgameLimit, std::min(npm, MidgameLimit));
-
-  return Phase(((npm - EndgameLimit) * PHASE_MIDGAME) / (MidgameLimit - EndgameLimit));
-}
-
-
 /// Position::slider_blockers() returns a bitboard of all the pieces (both colors)
 /// that are blocking attacks on the square 's' from 'sliders'. A piece blocks a
 /// slider if removing that piece from the board would result in a position where
diff --git a/src/position.h b/src/position.h
index 22afb3e1..ce526b91 100644
--- a/src/position.h
+++ b/src/position.h
@@ -146,7 +146,6 @@ public:
 
   // Other properties of the position
   Color side_to_move() const;
-  Phase game_phase() const;
   int game_ply() const;
   bool is_chess960() const;
   Thread* this_thread() const;