If the Black knight (at h4) must stay immobile and cannot be captured, how can you get the White king (at h2) to the empty f1 square by making consecutive White moves within the portion of the board shown? At any time, the White King may not move into check.

Using standard chess notation*, the following succession of 26 moves will accomplish the task of moving the king to f1:

1. Bf1
2. Qg2
3. Kh3
4. Bh2
5. Rg1
6. Qh1
7. Bg2
8. Rf1
9. Bg1
10. Kh2
11. Bh3
12. Qg2
13. Kh1
14. Bh2
15. Rg1
16. Qf1
17. Rg2
18. Bg1
19. Rh2
20. Bg2
21. Rh3
22. Bh2
23. Kg1
24. Bh1
25. Qg2
26. Kf1

*For those unfamiliar, each move of a piece is indicated by the piece's letter (K=King, Q=Queen, B=Bishop, R=Rook, N=Knight) plus the coordinate of the destination square.

Posted by Dej Mar on 2008-07-23 19:46:05