(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play]AW[ql][qm][qo][rp][lq][nq][qq][rq][or][pr]AB[on][pn][mp][op][pp][qp][pq][qr][rr][sr]C[Black to play and trap some white stones]
(;B[ro]C[This move doesn't work]
;W[rn]
;B[so]
;W[sn]
;B[sq]
;W[sp])
(;B[qn]
;W[rn]C[This way White has no weakness])
(;B[mr]
;W[mq]C[There is no threat on this side either.])
(;B[rn]C[This is the move that cuased White to have problems]
(;W[ro]
;B[qn]C[White is disconnected and because of the corner cannot
win the capturing race,]
;W[qs]
;B[so]
;W[rs]
;B[sp]
;W[ps]
;B[sq])
(;W[qn]
;B[ro]
;W[rm]
;B[sp]C[Black simply captures this way.])))
