“Check” means your king is under attack and must be made safe immediately. “Checkmate” means the king is in check and there is no legal way to escape — the game ends. Below are the three legal ways to get out of check, with classic diagrams.
When the king is being attacked directly by an opponent's piece, we say the king is in check. In the diagram below, the black king is checked by the white bishop:
In this diagram, the king escapes by moving away from the checking line.
Here, the black bishop blocks the check by moving between the bishop and king.
In this example, the checking bishop can be captured by the black rook.
If the king is in check and cannot escape by any of the three methods above, it is checkmate and the game is lost.
In this diagram, the white queen delivers checkmate:
When the king is attacked directly by an opponent's piece, it is said to be in check and must be made safe immediately.
You can get out of check by moving the king to a safe square, blocking the check with another piece, or capturing the attacking piece.
Checkmate occurs when the king is in check and cannot escape, resulting in the loss of the game.
The player with the white pieces always moves first.
Now that you know check and checkmate, the next key beginner rule is castling.