(;GM[1]FF[3]SZ[19]
AW[pa][pb][qc][rc][rd]AB[ob][nc][pc][pd][qd][qf][qh]PL[B]C[Black to play and kill.];B[ra]
(;W[qb];B[re])
(;W[re];B[rf]
(;W[se]
(;B[qb];W[rb];B[oa])
(;B[sb]TR[sb];W[rb];B[oa];W[qb];B[sc]))
(;W[qb];B[se];W[sd];B[sb])))