Pawn Endgame: Black to Play and Win

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apchkm8

WALKINGLOSS

Would it be f5-f4 to keep the king away from the critical g3 square?

mostly_terrible

Definetely not 1...f4, it's too slow. Probably immediate 1...Kf6 heading to g3 might work because white has to waste time capturing the d3 pawn.