(;SZ[19]AW[pp]AW[qp]AW[rp]AW[nq]AW[oq]AW[rq]AW[rr]AW[rs]AB[oo]AB[po]AB[qo]AB[ro]AB[np]AB[lq]AB[mq]AB[qq]AB[nr]AB[qr]AB[qs]C[If black can save his 3 stones, white's corner will die.]GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]KM[0.00]PW[White]PB[Black]
(;B[os]
(;W[or];B[ps];W[mr];B[ns];W[ms]
(;B[lr]C[RIGHT])
(;B[ls]C[RIGHT]))
(;W[ps]
(;B[pr];W[or];B[mr];W[pq])
(;B[or]C[RIGHT])))
(;B[or];W[pr]
(;B[ps];W[pq];B[os];W[mr])
(;B[pq];W[ps])
(;B[os];W[pq];B[ps];W[mr]))
(;B[pr];W[or];B[os];W[pq]))