(;AW[ab]AW[bb]AW[cb]AW[da]AB[db]AB[dc]AB[cc]AB[bc]AB[ba]AW[eb]AW[fb]AW[gb]AB[ec]AB[fc]AB[gc]AB[hc]AW[hb]AB[ic]AB[ib]AB[ia]AW[ha]AB[be]AP[goproblems]
(;W[ca];B[fa]
(;W[ea]C[RIGHT])
(;W[ga];B[ea]))
(;W[ea];B[ca])
(;W[ac];B[ca])
(;W[fa];B[ca])
(;W[ga];B[ea])
(;W[aa];B[fa];W[ea]C[this lives, but C19 as a first move is better so that A17 is not black senteRIGHT]))