(;GM[1]FF[3]SZ[19]
AW[nb][mc][oc][od][pd][qd][rd]AB[ob][pc][qc][rc]PL[B]C[Black to play and get a ko.]
(;B[pa]TR[pa];W[sc])
(;B[qb]TR[qb];W[ra];B[pa];W[na])
(;B[ra]TR[ra];W[sb];B[sc];W[pb])
(;B[qa]TR[qa];W[oa])
(;B[pb]TR[pb];W[oa])
(;B[oa];W[qa]
(;B[qb]TR[qb];W[ra])
(;B[ra];W[rb];B[qb];W[sa];B[pa];W[sc];B[ra])))