Two Pawns Against One
White to play and win
PlayA queenside majority and nothing else on the board. The break b6 stares at you, and playing it now throws the win away: majorities are converted with the king first and the break last.
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Two Pawns Against One
Win against perfect defense
Waking the engine…
The theory
Almost every winning endgame passes through a pawn majority somewhere, and 2 vs 1 is the majority in its purest form. The position is completely winning, and the single most natural move in it is the only real way to spoil everything.
Why the break waits. The advance b6 creates a passed pawn, which is exactly why it looks compulsory. But played immediately it just hangs: the pawn arrives on b6 unprotected, the defending king removes it, and the remaining blocked a-pawns are a handshake. A pawn break is not an achievement in itself; it is a liquidation, and liquidations are timed by where the kings stand.
The king does the winning. With the break held in reserve, the defending king lives under a permanent double duty: it must stay in touch with the b6 square AND meet your king's march. It cannot do both. Your king walks through the center, d3 to e4 to d5, gaining ground every time the defender chooses one job over the other. This is the principle of two weaknesses in five pieces.
The timed squeeze. Once your king reaches c6, b6 transforms from a trade offer into a crowbar: the defending king is pushed onto the back rank, your king turns around to harvest a5, and the surviving b-pawn promotes with a textbook shouldering escort. Note which pawn does the queening: the knight pawn, not the rook pawn. Trading down to the a-pawn alone would resurrect the corner fortress you already know, which is one more reason the move order is the entire game.