1. Kd5 Kf8 Fritz suggests, but we did not consider, what is likely the best defense 1... Kh6!! when I cannot find the win: 2. Ke5 Kg7! 3. Kd6! Kh7!! 4. Kd7 (4. Ke7 Kg8 5. f5 (5. Kd8 Kh7 6. Ke8 Kg7 7. Ke7 Kg8 8. f5 gxf5 9. gxf5 Kg7=) 5... gxf5 6. gxf5 Kg7=) 4... Kh8 5. Ke8 Kg7 6. Ke7 so there is a second puzzle for you! 2. Kd6 Ke8 3. f5! g5 3... gxf5 4. gxf5 Kd8 5. f6 Ke8 6. Kc7 Kf8 7. Kd8 Kg8 8. Ke7 Kh7 9. Kxf7 4. Kc7! Ke7 5. Kc8!! f6 5... Ke8 6. f6 Kf8 7. Kd8 Kg8 8. Ke8 Kh8 9. Kxf7 6. Kc7 Ke8 7. Kd6 Kf7 8. Kd7 Kf8 9. Ke6 Kg7 10. Ke7 1-0