From a 3-on-1 game at a Go Congress. I missed the answer in the game... of course.
(;C[Black to play and live.]SZ[13]AB[ec]AB[ic]AB[hd]AB[ge]AB[fe]AB[fd]AB[fc]AB[gc]AB[hc]AW[jc]AW[jb]AW[id]AW[je]AW[dc]AW[db]AW[he]AW[hf]AW[gf]AW[ff]AW[ee]AW[ed]PL[B]GM[1]FF[4]VW[]AP[Many Faces of Go:10.0]HA[0]ST[0]KM[5.5](;B[ga];W[ha](;B[ia];W[fa](;B[hb];W[fb](;B[gb]C[RIGHT])(;B[eb]C[RIGHT])(;B[ib]C[RIGHT]))(;B[ea];W[gb](;B[fb];W[ib];B[hb]C[RIGHT])(;B[hb](;W[fb];B[eb]C[RIGHT])(;W[ib];B[fb]C[RIGHT]))(;B[eb];W[ib];B[hb]C[RIGHT])(;B[ib];W[eb];B[fb]C[RIGHT];W[ga];B[hb];W[ga]))(;B[fb]C[RIGHT]))(;B[hb];W[fb];B[eb];W[ea](;B[ia];W[fa](;B[gb];W[da];B[ib]C[RIGHT])(;B[ib]C[RIGHT]))(;B[fa];W[gb];B[fa];W[ga];B[ia];W[da];B[fa];W[ga];B[fb]C[RIGHT])(;B[gb]C[RIGHT])(;B[ib]C[RIGHT]))(;B[fa];W[eb](;B[hb];W[fb]C[WRONG])(;B[ia];W[fb]))(;B[ib];W[ea];B[ia];W[gb];B[hb];W[fb];B[eb]C[RIGHT])(;B[eb];W[gb](;B[fb];W[fa];B[ia];W[ib];B[hb];W[ja];B[ea]C[RIGHT])(;B[hb];W[fa](;B[fb];W[ia];B[ga]C[Ko])(;B[ea];W[ia]C[WRONG])(;B[ia](;W[ga];B[ea]C[RIGHT])(;W[ib];B[fb]C[RIGHT]))))(;B[ja];W[ib];B[hb];W[ea];B[fa];W[fb];B[ia];W[eb];B[kb];W[kc];B[lb]C[RIGHT]))(;B[fa];W[eb]C[WRONG];B[fb];W[ha];B[hb];W[ga];B[ia];W[ib])(;B[eb];W[ga](;B[gb];W[fa];B[ha];W[ib]C[WRONG])(;B[ha]C[RIGHT])(;B[ib];W[ia];B[ha](;W[hb](;B[gb];W[fa]C[WRONG];B[ha]C[];W[ja](;B[ea];W[hb]C[Ko])(;B[fb];W[hb]C[Ko])(;B[hb];W[ea])(;B[da];W[hb]C[Ko]))(;B[fa];W[gb];B[fb]C[RIGHT]))(;W[ea];B[fa];W[fb];B[gb];W[hb];B[fa]C[Alive with double koRIGHT]))(;B[fa]C[RIGHT]))(;B[ib](;W[ga](;B[fa]C[RIGHT];W[ha];B[gb];W[eb]C[WRONG])(;B[ha]C[RIGHT]))(;W[eb];B[ga]C[RIGHT]))(;B[ha];W[ib]C[WRONG];B[hb];W[fa])(;B[gb];W[ga](;B[ha];W[ib](;B[eb];W[fa])(;B[hb];W[eb];B[fb];W[fa];B[ea];W[fa])(;B[fa];W[eb]))(;B[ib];W[ha];B[ia];W[fa])(;B[fa];W[eb](;B[ha];W[ib])(;B[ib];W[ha])(;B[fb];W[ha];B[ia];W[ib];B[hb];W[ha]))(;B[eb])))