(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play]AW[nq][oq][pq][mr][nr][or][qr][sr][ns]AB[lo][oo][qo][ro][mp][qp][mq][qq][lr][ls][ms][os][ps]
(;B[rr]C[This wedge is the correct first move]
(;W[rq]
;B[rs]C[And then after the atari if black drops here white can do nothing ]
(;W[qs]C[This is self-atari.]
;B[pr])
(;W[ss]C[This is self-atari.]
;B[sq])
(;W[sq]C[If here black just fills a librty above the three white stones,]
(;B[sp]C[White is still short of liberties here.

White can still capture the two black stones at
the bottom but that is only one eye.])
(;B[rp]C[This move also fills a liberty.])))
(;W[rs]
;B[rq]))
(;B[qs]C[This fails.]
;W[rs]
;B[rq]
;W[rr]C[White makes two eyes.])
(;B[pr]
;W[rr]
;B[qs]
;W[rs]C[Again two eyes.])
(;B[rs]
;W[rr]
;B[qs]
;W[pr]C[And this is also a live shape.]))
