BARDEN’S CHESS PROBLEMS

Hannes Stefansson v Garry Kasparov, Iceland television match, 1995

Earlier in this game, Kasparov sidestepped a clear winning line so as to set up a visually impressive, television-friendly finish. In the puzzle diagram, his preparations were complete. The then world champion (Black, to move) made his next turn with a flourish, before grinning at the camera. What did he play?