No. 34
4+3. #4
1+2. Retract one black move, and #4
1+3. Retract one white move, and #2. (b): d2->c1; Retract one white move, and #3.
4+2. #3.
15+13. #1
15+10. History of the black knight on h1?
14+13. Last move?
14+12. Add a piece on a1!
15+6. #1
14+3. Last 2 moves?
14+13. Shortest route of a queen?
10+12. Minimal number of queen moves?
29+0. Colour the pieces; Last 19 moves?
