(;GM[1]FF[4]SZ[19]AP[SmartGo:0.7.1]CA[UTF-8]
GN[177cx]
PB[Black to capture]
RU[Japanese]ST[2]
AB[ko:oo][qo][jp][pp][iq][kq][nq:ns][oq][qq:rq]
AW[lp:op][lq][pq:pr][mr:ms][qr]
(;B[kp]
C[Filling an outside liberty like this is too slow.];W[lr];B[kr];W[os])
(;B[lr]
C[This is the vital point to reduce White's liberties.]
(;W[kr];B[mq];W[ls];B[kp];W[lr];B[jr]
C[White runs out of liberties.])
(;W[mq];B[kp])
(;W[os];B[kp];W[mq];B[ls])))

