No. 159, February 1998
9919 - Nikita Plaksin and Alexander Zolotarew Die Schwalbe Heft 169, 02/1998
12+13. Mate in 1 (3 wh. Knights)
4+15. Helpmate in 4
13+11. Last 5 captures?
11+14. Was 1.e2-e4 possible? (3 wh. Bishops)
15+14. Proof game in 23.0 moves
11+1. Retract one White move, then mate in 1
13+1. Retract one White move, then mate in 1
15+1. Retract one White move, then mate in 1
15+2. Retract one White move, then mate in 1
16+1. Retract one White move, then mate in 1
8+9. Win
16+16. Shortest proof game?
14+14. Shortest proof game?