No. 33
2+2. Retract 1 move, and #2
3+1. Retract 1 move, and #2
13+13. Legal position?
11+14. Could the game have started with 1. c2-c3?
9+15. Mate?
5+11. shc#14 (Consequent series helpmate in 14)
13+14. #1