Good Afternoon Puzzlers, Please refer to Paul's post on this problem for a more detailed analysis of the problem. My short answer follows. The best move is: 1. Rg4+ Principle: Here once again the black king is severely restricted in movement to the G and H files, so white can force the issue. 1. Rg4+ fxg4 2. Qg6+ Kh8 3. Qh7#