Chess position after 22...a5 in Gasiorowski-Gawronski, Darmstadt, 1994 [FEN: r4r2/2qb1p1k/2n2b1p/p1p1pP1P/1p4Q1/2PB2R1/PP2NPP1/R5K1 w - - 0 23]

White found an amazing resource to save this game. Can you find it?

This is one of the many excellent positions found in John Nunn’s book Learn Chess Tactics. Here’s how he describes the puzzle:

“White is a piece down for one pawn, and his threats on the kingside appear to have come to nothing. Indeed, if Black were now given a free tempo to play …Rg8 then White would be facing inevitable defeat. All this means that if White is going to try something, then he must do so straight away.”

Analysis board