Every move in chess, from the first pawn push to a complex queen maneuver, is ultimately aimed at a single goal: checkmate. This is the moment the game ends. It's the decisive blow that secures victory.

Checkmate occurs when a king is under attack, a situation called 'check', and has no legal way to escape. The threatened player cannot move their king to a safe square, capture the attacking piece, or block the attack with another piece. The king is trapped, and the game is over.

Let's break down the three conditions that must be met for a king to be in checkmate:

1. The king is in check.
2. The king cannot move to any adjacent square without being in check.
3. The attack cannot be blocked or the attacking piece captured.

When you record chess moves, a special symbol marks the final, winning move. In algebraic notation, a checkmate is indicated by the hash symbol (#), sometimes called a pound sign or number sign.

Now that you understand what checkmate is, let's test your knowledge.

Mastering the concept of checkmate is the first step toward winning games. All tactics and strategies are built around creating opportunities for this final move.