(;SZ[13]AB[ca]AB[cb]AB[cc]AB[cd]AB[dd]AB[ec]AB[fd]AB[gd]AB[gc]AB[ga]AB[gb]AW[eb]AW[ed]AW[ba]AW[bb]AW[bc]AW[bd]AW[ce]AW[de]AW[ee]AW[fe]AW[ge]AW[hd]AW[hc]AW[hb]AW[ha]AP[goproblems]
(;B[ea];W[db]
(;B[fb]C[RIGHT])
(;B[dc];W[fb];B[fc]C[Just seki, Black can do better.])
(;B[da];W[fb];B[fa]C[Just seki, Black can do better.]))
(;B[db];W[fa]
(;B[fc];W[da]C[ko])
(;B[ea];W[da]C[ko]))
(;B[fb];W[da]
(;B[dc];W[fa]C[ko])
(;B[ea];W[fa]C[ko])))