(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]SZ[19]KM[0.00]PB[White to play and kill]AB[rr][rq][sp][so][ro][qo][po][oo][no][mo][mp][mq][lr][ls][rs]AW[sr][qs][qr][pr][or][nr][ns][np][op][pp][qp][rp]
(;B[nq]C[Black must not push from this
side.];W[qq];B[oq];W[sq];B[ss];W[sq];B[sr]
;W[sq]C[White captures five stones and
is alive])(;B[qq]C[Instead Black pushes from
within.];W[pq];B[nq];W[sq];B[ss];W[sq];B[sr]
;W[sq]C[This is similar to before, but
now Black can atari safely.];B[rq];W[rr]
;B[sr]C[White is dead.])
)
