| Community Blog Discussions - X-Ray Attacks: Hidden Pressure, Sudden Impact#5 For the last puzzle, 1... Qxd4+ 2. Qf2 Qxa4 doesn’t work because after 3. hxg6+ Kg8 (note that 3... Kxg6 loses to 4. Qg3+ Kf7 5. Qxg7+ Ke8 6. Bf6+), there’s 4. Bc4+!! Qxc4 5. Qh4 and mate is unstoppab… | Math_Is_Fun |