Chess rules
Stalemate in Chess: The Surprise Draw
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Stalemate happens when the player to move has no legal move but is not in check. The game ends immediately in a draw. It often appears when a side with a large material advantage restricts a bare king without giving check.
Stalemate vs checkmate
These two look identical — in both, the player to move has no legal move — but the outcome is opposite, and the difference is a single question: is the king in check? If yes, it is checkmate and a win. If no, it is stalemate and a draw. In the diagram below it is Black to move; the king is not under attack, but every square it could go to is covered. With no legal move and no check, the game is a draw.
How not to stalemate
A common accidental stalemate occurs with a queen against a lone king. Before a quiet move, check whether the enemy king or any remaining piece will have a legal reply. If the move leaves none and does not give check, the game ends in a draw. In the practice position below, White has mate in one, while a different queen move stalemates.
Stalemate as a saving resource
Stalemate is not only a mistake to avoid; it can be a defensive resource. A player who is far behind may be able to sacrifice the last mobile pieces and leave no legal move, securing a draw. Spotting that possibility — and preserving a legal reply when winning — is an important part of endgame calculation.