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.

The other solutions are longer:

:bf1:qg2:kh3:rh2:qh1:rg2:bh2:rg1:bg2:rf1:qg1:bh1:qg2:bg1:kh2:qh3:bg2:kh1:bh2:rg1:bf1:rg2:bg1:rh2:qg2:rh3:bh2:kg1:qh1:bg2:kf1
:bf1:qg2:kh3:rh2:qh1:rg2:bh2:rg1:bg2:rf1:bg1:qh2:bh1:qg2:kh2:qh3:bg2:kh1:bh2:rg1:bf1:rg2:bg1:rh2:qg2:rh3:bh2:kg1:qh1:bg2:kf1
:bf1:qg2:kh3:rh2:qh1:rg2:bh2:rg1:bg2:rf1:bg1:kh2:bh3:qg2:kh1:bh2:rg1:qf1:rg2:bg1:rh2:bg2:rh3:bh2:kg1:bh1:qg2:kf1
:bf1:qg2:kh3:bh2:qg1:bg2:qf1:rg1:bh1:qg2:rf1:bg1:kh2:qh3:bg2:kh1:bh2:rg1:bf1:rg2:bg1:rh2:qg2:rh3:bh2:kg1:qh1:bg2:kf1

There may be even longer solutions.

Posted by Charlie on 2008-07-24 15:11:10