Removes a few Bitboards and functions that are not used

src/bitboard.h

@@ -32,7 +32,6 @@ std::string pretty(Bitboard b);
 
 } // namespace Stockfish::Bitboards
 
-constexpr Bitboard AllSquares = ~Bitboard(0);
 constexpr Bitboard DarkSquares = 0xAA55AA55AA55AA55ULL;
 
 constexpr Bitboard FileABB = 0x0101010101010101ULL;
@@ -53,17 +52,6 @@ constexpr Bitboard Rank6BB = Rank1BB << (8 * 5);
 constexpr Bitboard Rank7BB = Rank1BB << (8 * 6);
 constexpr Bitboard Rank8BB = Rank1BB << (8 * 7);
 
-constexpr Bitboard QueenSide   = FileABB | FileBBB | FileCBB | FileDBB;
-constexpr Bitboard CenterFiles = FileCBB | FileDBB | FileEBB | FileFBB;
-constexpr Bitboard KingSide    = FileEBB | FileFBB | FileGBB | FileHBB;
-constexpr Bitboard Center      = (FileDBB | FileEBB) & (Rank4BB | Rank5BB);
-
-constexpr Bitboard KingFlank[FILE_NB] = {
-  QueenSide ^ FileDBB, QueenSide, QueenSide,
-  CenterFiles, CenterFiles,
-  KingSide, KingSide, KingSide ^ FileEBB
-};
-
 extern uint8_t PopCnt16[1 << 16];
 extern uint8_t SquareDistance[SQUARE_NB][SQUARE_NB];
 
@@ -178,16 +166,6 @@ inline Bitboard pawn_attacks_bb(Color c, Square s) {
 }
 
 
-/// pawn_double_attacks_bb() returns the squares doubly attacked by pawns of the
-/// given color from the squares in the given bitboard.
-
-template<Color C>
-constexpr Bitboard pawn_double_attacks_bb(Bitboard b) {
-  return C == WHITE ? shift<NORTH_WEST>(b) & shift<NORTH_EAST>(b)
-                    : shift<SOUTH_WEST>(b) & shift<SOUTH_EAST>(b);
-}
-
-
 /// adjacent_files_bb() returns a bitboard representing all the squares on the
 /// adjacent files of a given square.
 
@@ -430,14 +408,6 @@ inline Square pop_lsb(Bitboard& b) {
   return s;
 }
 
-
-/// frontmost_sq() returns the most advanced square for the given color,
-/// requires a non-zero bitboard.
-inline Square frontmost_sq(Color c, Bitboard b) {
-  assert(b);
-  return c == WHITE ? msb(b) : lsb(b);
-}
-
 } // namespace Stockfish
 
 #endif // #ifndef BITBOARD_H_INCLUDED

src/position.h

@@ -149,7 +149,6 @@ class Position {
   Key key() const;
   Key key_after(Move m) const;
   Key material_key() const;
-  Key pawn_key() const;
 
   // Other properties of the position
   Color side_to_move() const;