Good Morning Puzzlers, In problem WAC009, the best move is: 1... Bh2+ Principle: Notice first that the white king is trapped in the corner. If black can get his queen to h4 white can be mated. But white can move his queen across to h3 if not done correctly. So first 1... Bh2+ forces 2. Kh1 Next 2... Bg3+ forces 3. Kg1 and blocks the queen's path to h3 Then 3... Rh1+ forces 4. Kxh1 Now the queen can check 4... Qh4+ forcing 5. Kg1 Finally, the mate 5... Qh2# Doing this in the right order forces the mate. According to Rod, the Fritz engine reports: Any other first move for black leads to a very strong or winning advantage for white.