/// move_to_san() takes a position and a move as input, where it is assumed
-/// that the move is a legal move from the position. The return value is
+/// that the move is a legal move for the position. The return value is
/// a string containing the move in short algebraic notation.
const string move_to_san(Position& pos, Move m) {
+ if (m == MOVE_NONE)
+ return "(none)";
+
+ if (m == MOVE_NULL)
+ return "(null)";
+
assert(pos.is_ok());
assert(move_is_ok(m));
PieceType pt = piece_type(pos.piece_on(from));
string san;
- if (m == MOVE_NONE)
- return "(none)";
-
- if (m == MOVE_NULL)
- return "(null)";
-
if (move_is_castle(m))
san = (move_to(m) < move_from(m) ? "O-O-O" : "O-O");
else