1 move problem used for discussion on godiscussion.
(;AW[ab]AB[bb]AB[ca]AB[cb]AB[cc]AB[db]AB[ec]AB[fc]AB[fa]AB[gc]AB[hc]AB[ic]AB[ib]AW[ga]AW[hb]AW[ia]AW[jb]AW[ja]AW[jd]AW[jc]AW[id]AW[hd]AW[gd]AW[fd]AW[ed]AW[dc]AW[dd]AW[bd]AW[cd]AW[bc]C[white to kill. ko is not a solution]AP[goproblems]
(;W[ha]C[];B[ea];W[fb];B[eb];W[gb]C[RIGHT])
(;W[ea];B[gb]
(;W[fb];B[eb]C[])
(;W[ha];B[eb]))
(;W[fb];B[eb];W[ea];B[gb])
(;W[gb];B[fb];W[ha];B[ea])
(;W[eb];B[ea]))