So, this came up in a game of mine recently. It's an extremely useful technique to know!

Roughly knew the tactic, but thanks for the clarification, and nice puzzle!!!

It's a particularly satisfying manuevere, as black is helpless. If 49...gxh4, 50. fxg6! One must be careful not to do it too close to your own back rank, or the opposition pawn majority will be dangerous, or, as in this case, have your King blocking the now fractured opposition pawns.

oh wow

I have used this in one or two games.