Surprisingly I made mistake in this position in one of my games.
There are very few variations so play the really best path, please.
As usual, small trick is included to make it a bit harder :o)
(;AW[jb]AW[kc]AW[hc]AW[gc]AW[fc]AB[kd]AB[jd]AB[id]AB[hd]AB[gd]AB[fd]AW[ld]AW[md]AW[nc]AW[mb]AW[ob]AW[nd]AW[pa]AB[qa]AB[qb]AB[pb]AB[pc]AB[oc]AB[od]AB[oe]AB[me]AB[le]AB[ne]AW[ec]AB[ed]AW[dd]AW[de]AW[df]AB[ef]AB[ee]AB[dh]AB[ch]AB[fg]AB[eh]AB[fh]AW[bf]AB[bg]AW[af]AB[ag]AW[cf]AW[na]AW[nb]AW[dc]C[How should white play here? Assume the ko is worth O,5 points.]AB[cj]AB[aj]AB[bj]AB[ci]AP[goproblems]
(;W[cg];B[bh];W[dg];B[oa]C[The optimal play for both players. The points around J17 were just neutral points!RIGHT])
(;W[ic];B[jc];W[kb];B[cg];W[dg];B[oa]C[You could do one point better.])
(;W[dg];B[cg]
(;W[oa]C[You could do O,5 points better.])
(;W[ic];B[jc];W[kb];B[oa]C[You could do one point better.])))
