Checkmate

Allow me to introduce myself: Aristarh. Checkmate is a check from which there is no escape: the king has nowhere to go, nothing to block with, and the attacker cannot be captured. Checkmate ends the game immediately — the one who delivered it wins, and the number of pieces left interests no one. Note: the goal of chess is not to exterminate the opponent's army, but to catch the king. Beginners get carried away hunting pieces and miss a mate in one — do not repeat that mistake.

Let us examine the classical mechanism. The black king is locked on the eighth rank, and your own king on f6 takes away all his squares on the seventh — the escape route is cut off. It remains to strike along the back rank with the rook: a check with no shelter and no retreat. This is called the back-rank mate — the simplest and most important of them all. Deliver mate in one move.