(;GM[1]FF[4]SZ[19]AP[SmartGo:0.7.1]CA[UTF-8]
GN[177bx]
PB[Black to live]
RU[Japanese]ST[2]
AB[pq:qq][or][rr][ps]
AW[po][op:oq][qp:rp][nr:ns]
(;B[sr]
C[This move enlarges the eye space.];W[rs];B[qs];W[pr];B[qr];W[os]
C[However Black cannot make two eyes.])
(;B[qs]
C[This is the move that makes eye shape.];W[sr]
C[White can try playing here.];B[sq];W[rq];B[ss]
C[Black makes two eyes.];W[pr]
C[This move doesn't kill because of the outside liberty above.];B[os]))

