(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play and capture some stones]AW[rp][mq][oq][rq][lr][mr][pr][qr]AB[ro][so][mp][np][op][pp][qp][sp][kq][lq][kr][ls]
;B[rr]C[This is the first move to make use of white's poor shape]
;W[sr]
;B[rs]C[Never sacrifice just one stone.]
(;W[qq]C[If white connects here ....]
;B[os]C[... then black gets to play the vital point here.]
;W[nr]
;B[or]
(;W[ns]C[This is white's strongest answer.]
;B[pq]
;W[ps]
;B[or]
;W[nq]
;B[sq]C[But now white cannot atari the two black stones and white is all dead.])
(;W[nq]C[Likewise the two connections fail.]
;B[pq]
;W[ps]
;B[sq]C[All white's are dead])
(;W[pq]C[Tha same.	]
;B[nq]
(;W[sq]
;B[ns])
(;W[ps]
;B[sq])))
(;W[os]C[So white must try and save some of his stones.]
(;B[nq]C[If black pushes through here.]
;W[qs]C[WHite lets him capture three stones.]
;B[nr]
;W[or]
(;B[qq]C[It may look like the white stones are dying.]
;W[sq]C[However white plays this sacrifice.]
;B[ss]
;W[rq]C[To create the under the stones move for a corner eye.])
(;B[sq]
;W[qq]C[Also alive]))
(;B[qq]C[Black should go for the corner not the other three stones.]
;W[qs]
(;B[sq]
;W[nq]C[WHite lives but loses the corner.])
(;B[nq]C[If black switches back to here.]
;W[nr]
;B[ms]
;W[sq]C[White can make the under the stones shape and live with all.]
;B[ss]
;W[rq]))))
