The position comes from the game Navara, D (2707) – Daylo,D (2552) World Cup 2009. The opening (and the game) were annotated by Mihail Marin in Megabase. In this position several Rook moves such as RC1, Rb4 and RC5 gave Black a decisive advantage, but it is actually a pawn move (g3) that wins the game on the spot. The question is why are we looking at this position if several moves win? The answer (supported by the game continuation) is that a rook move like RC5 gives White drawing chances. Daylo played Rc5 with the idea of supporting the g pawn, but lost the d pawn in the process. 48…Rc5 [48…g3 49. Kxc4 g2 50.Rd7+ Kxf6 51.Rd6+ Kf5 52.Rd5+ Ke6 the pawn on h6 prevents the rook from attacking the pawn from behind.] diagram
The game continue 49. Ke4 Rg5 50.Rxd4 reaching a critical position for Black. A natural move squanders the advantage and playing with a plan wins the game.
50…Kxf6? [50…g3 51.Rd1 h5 52.Kf3 h4 53.Kg2 Rf5 54.Kh3 Rf4 The advance of the g pawn forces the white piece to take passive positions and the rook on the f file offers a shelter to the Black king against rook checks.]
51. Rd6+ Kg7 52.Kf4 Kh7 53.Kg3 h5 54.Kh4 Rg6 55.Rd5 g3 56.Rd1 Kh6 57 Rg1 =