Quite a few people emailed in the correct solution to Friday's chess puzzle; congratulations to, amongst others, Prashant, Chris and Rich's niece Danielle (for the previous puzzle). It was Black to play in this somewhat desperate looking position:
1 ... Rg4+; 2 Kxg4 Qg2+; 3 Kh4 g5+; 4 fg+ Qxg5 mate
The first move is not too difficult to spot, as you need to find a check to avoid being mated next move, but the checkmate is elegant nonetheless.
It's from the chapter on 'enticement' in Gennady Nesis's book: Tactics in the King's Indian