I missed the tactic in this position, as I recall being focused on the b3 square, until I realised the knight covered it. Having little time left I played the innocuous Kg8.
Black to play
Knowing a tactic is present it is relatively easy to find. If only there was a reliable way to signal a "tactic alert" in a game, rather than the playing through of thousands of problems to force patterns into your head ! Until that discovery, its back to ChessTempo !