Pull #3458 removed the only usage of pos.see_ge() moving pieces that
don't belong to the side to move, so we can simplify this, adding an assert.
closes https://github.com/official-stockfish/Stockfish/pull/3607
No functional change
if (swap <= 0)
return true;
+ assert(color_of(piece_on(from)) == sideToMove);
Bitboard occupied = pieces() ^ from ^ to;
- Color stm = color_of(piece_on(from));
+ Color stm = sideToMove;
Bitboard attackers = attackers_to(to, occupied);
Bitboard stmAttackers, bb;
int res = 1;