(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play]AW[ql][sl][qm][pn][po][qo][ro][so][rp][rq][sq]AB[pk][qk][rk][sk][pl][pm][on][rn][oo][op][qp][nq][qq][rr][sr]C[Black to play and kill]
(;B[qn]C[This wedge doesn't work.]
;W[rm]
;B[rl]
;W[sn])
(;B[rl]C[Nor does this work.]
;W[rm]
;B[sm]
;W[qn]
(;B[sl]
;W[sn])
(;B[sn]
;W[sl]
;B[sm]
;W[sn]))
(;B[sm]C[Nor this]
;W[rm]
;B[rl]
;W[qn]
;B[sl]
;W[sn])
(;B[sn]C[Nor This]
;W[rm]
(;B[rl]
;W[qn]
;B[sm]
;W[sl]
;B[sm]
;W[sn])
(;B[sm]
;W[qn]
;B[sm]
;W[sn]))
(;B[rm]C[The threat to escape is the move that works]
(;W[rl]
;B[qn]C[Now white is short of liberties.])
(;W[qn]
;B[rl])))
