Key Squares: The Winning Map

The opposition tells you HOW to fight with kings; key squares tell you WHAT the fight is for. Together they turn king and pawn endings from calculation into reading a map.

The definition. A key square is a square whose occupation by the attacking king wins by force, no matter whose move it is and no matter where the defending king stands. For a pawn on its second, third or fourth rank the key squares sit two ranks ahead of it, on its file and the two neighboring files. From the fifth rank onward they move closer: the three squares directly ahead on the next rank. And once your king reaches the sixth rank in front of its pawn, every subtlety disappears: the position simply wins.

Why they matter. Instead of calculating opposition duels ten moves deep, you ask one question: can my king reach a key square? If yes, head there and only then think about the pawn. Most botched pawn endings die from pushing the pawn before the king has claimed its square, which shrinks the key-square map with every step.

In this drill your king already stands on a key square, so the theoretical work is done. The tablebase defender will test whether you know what that means in practice: sidestep, clear the path, and walk the pawn home without ever giving the square back.