Remove unused functions

src/position.cpp

@@ -211,7 +211,7 @@ void Position::set_check_info() const {
 // The function is only used when a new position is set up
 void Position::set_state() const {
 
-    st->key = st->materialKey = 0;
+    st->key           = 0;
     st->majorPieceKey = st->minorPieceKey = 0;
     st->nonPawnKey[WHITE] = st->nonPawnKey[BLACK] = 0;
     st->pawnKey                                   = Zobrist::noPawns;
@@ -257,10 +257,6 @@ void Position::set_state() const {
 
     if (sideToMove == BLACK)
         st->key ^= Zobrist::side;
-
-    for (Piece pc : Pieces)
-        for (int cnt = 0; cnt < pieceCount[pc]; ++cnt)
-            st->materialKey ^= Zobrist::psq[pc][cnt];
 }
 
 
@@ -551,7 +547,6 @@ void Position::do_move(Move m, StateInfo& newSt, bool givesCheck) {
 
         // Update hash key
         k ^= Zobrist::psq[captured][capsq];
-        st->materialKey ^= Zobrist::psq[captured][pieceCount[captured]];
 
         // Reset rule 60 counter
         st->check10[WHITE] = st->check10[BLACK] = st->rule60 = 0;

src/position.h

@@ -44,7 +44,6 @@ class TranspositionTable;
 struct StateInfo {
 
     // Copied when making a move
-    Key     materialKey;
     Key     pawnKey;
     Key     majorPieceKey;
     Key     minorPieceKey;
@@ -148,7 +147,6 @@ class Position {
     // Accessing hash keys
     Key key() const;
     Key key_after(Move m) const;
-    Key material_key() const;
     Key pawn_key() const;
     Key major_piece_key() const;
     Key minor_piece_key() const;
@@ -280,8 +278,6 @@ inline Key Position::adjust_key60(Key k) const {
 
 inline Key Position::pawn_key() const { return st->pawnKey; }
 
-inline Key Position::material_key() const { return st->materialKey; }
-
 inline Key Position::major_piece_key() const { return st->majorPieceKey; }
 
 inline Key Position::minor_piece_key() const { return st->minorPieceKey; }