(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[White]PB[Black to play and kill]AW[lp][lq][oq][rq][kr][or][qr][rr][ps]AB[kn][ln][mo][oo][qo][jp][mp][op][rp][jq][pq][qq][ir][pr]
(;B[nq]C[Black needs to disrupt White's shape around here. 
Note White only has one eye in the corner.]
;W[nr]
;B[mr]
;W[mq]
;B[np]
;W[ms]C[This is two eyes.])
(;B[mq]
;W[mr]
;B[nr]
;W[nq]
;B[ns]
;W[ms]
;B[np]
;W[os]C[Also two eyes.])
(;B[nr]C[This looks tricky.]
;W[nq]
;B[mq]
;W[mr]
;B[ns]
;W[ms]C[However White can easily handle it and live.])
(;B[mr]
;W[mq]
;B[nq]
;W[nr]
;B[ns]
;W[np]C[Also two eyes.])
(;B[ns]C[This is the correct move that looks at punishing White's bad shape.]
(;W[mr]C[This is a strong response]
;B[os]
;W[qs]
;B[mq]C[This and the next Black move are vital moves to keep White's eye to the left false.]
;W[nr]
;B[kq]
;W[js]C[This expands White's eye space.]
;B[lr]
;W[ls]
;B[jr]C[Nothing works for White and the white group is dead.])
(;W[nr]C[This is another tricky response form White.]
;B[mq]
;W[mr]
;B[os]
;W[ms]
;B[os]C[This keeps the edge eye false.]
;W[ns]
;B[kq]C[This makes the left eye false.]
;W[lr]
;B[ks]C[When White connects this move means no second eye for White thanks to the Black stone on the second line to the far left.]
;W[jr]
;B[js])))
