When a pawn reaches the back row, it can be exchanged for any major piece. Usually people choose to sub in a queen, but in some circumstances that’s not the best move.
If your opponent cannot win, they can still go for a tie (stalemate). If they cannot make a legal move, but their king is not currently in check, that’s a stalemate. If your pawn-turned-queen would bring this about, you’re better off converting the pawn into a bishop, rook, or knight (depending on the circumstances).
When a pawn reaches the back row, it can be exchanged for any major piece. Usually people choose to sub in a queen, but in some circumstances that’s not the best move.
If your opponent cannot win, they can still go for a tie (stalemate). If they cannot make a legal move, but their king is not currently in check, that’s a stalemate. If your pawn-turned-queen would bring this about, you’re better off converting the pawn into a bishop, rook, or knight (depending on the circumstances).