1. c5 Kh5

2. c6 Kg4 !

3. c7 !

Thematic try : 3. cxb7 ? Kf3 4. b8=Q ! (b8=R ? h2+(d3) -+) 4....h2+ 5. Kh1 g2+ 6. Kxh2 Kf2

7. f5 g1=Q+ 8. Kh3 = e.g. 8....Qh1+ 9. Kg4 Qg1+ 10. Kh5 Qd1+ ! 11. Kg6 Qg4+

12. Kf7 Qxf5+ 13. Kxg7 Qg5+ = perpetual check.

3....Kf3

4. c8=Q !

4. c8=R ? h2+(a5) -+

4....h2+

5. Kh1 g2+ !

6. Kxh2 Kf2

7. Qg4 ! +-

7. Kh3 ? g1=Q 8. Kh4 = e.g. 8....Qg3+ 9. Kh5 Kxe3 ! 10. Qxb7 Kxf4 11.Qc7+ Kf3 ! =

Illustration of « the small difference » : 3. c7 ! 3. cxb7 ?