/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
- Copyright (C) 2015-2020 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+ Copyright (C) 2004-2023 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include "endgame.h"
#include "movegen.h"
+namespace Stockfish {
+
namespace {
// Used to drive the king towards the edge of the board
assert(verify_material(pos, strongSide, RookValueMg, 2));
assert(verify_material(pos, weakSide, RookValueMg, 1));
- Square strongPawn1 = pos.squares<PAWN>(strongSide)[0];
- Square strongPawn2 = pos.squares<PAWN>(strongSide)[1];
+ Square strongPawn1 = lsb(pos.pieces(strongSide, PAWN));
+ Square strongPawn2 = msb(pos.pieces(strongSide, PAWN));
Square weakKing = pos.square<KING>(weakSide);
// Does the stronger side have a passed pawn?
Bitboard strongPawns = pos.pieces(strongSide, PAWN);
// If all pawns are ahead of the king on a single rook file, it's a draw.
- if (!((strongPawns & ~FileABB) || (strongPawns & ~FileHBB)) &&
- !(strongPawns & ~passed_pawn_span(weakSide, weakKing)))
+ if ( !(strongPawns & ~(FileABB | FileHBB))
+ && !(strongPawns & ~passed_pawn_span(weakSide, weakKing)))
return SCALE_FACTOR_DRAW;
return SCALE_FACTOR_NONE;
return SCALE_FACTOR_NONE;
Square weakKing = pos.square<KING>(weakSide);
- Square strongPawn1 = pos.squares<PAWN>(strongSide)[0];
- Square strongPawn2 = pos.squares<PAWN>(strongSide)[1];
+ Square strongPawn1 = lsb(pos.pieces(strongSide, PAWN));
+ Square strongPawn2 = msb(pos.pieces(strongSide, PAWN));
Square blockSq1, blockSq2;
if (relative_rank(strongSide, strongPawn1) > relative_rank(strongSide, strongPawn2))
// it's probably at least a draw even with the pawn.
return Bitbases::probe(strongKing, strongPawn, weakKing, us) ? SCALE_FACTOR_NONE : SCALE_FACTOR_DRAW;
}
+
+} // namespace Stockfish