(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play and rescue 5 stones]AW[qo][ro][op][pp][rp][nq][nr][rr][sr][os]AB[mp][np][qp][lq][oq][qq][or][qr]C[Black to play and rescue 5 stones]
(;B[mr]C[If black starts here...]
(;W[qs]C[... then this is a mistake by white]
;B[mq]
;W[ns]
;B[ms]
;W[ps]
;B[rs]
;W[ss]
;B[pr]
;W[rs]
;B[rq])
(;W[pq]C[... white should play here and black is doomed.]
;B[pr]
;W[qs]
;B[mq]
;W[ns]
;B[ms]
;W[ps]))
(;B[ps]
(;W[pq]C[If white plays here black fails.]
(;B[pr]
;W[ns]
;B[mr]
;W[rq])
(;B[ns]C[This also fails.]
;W[pr]
;B[os]
;W[ms]
;B[qs]
;W[rq]))
(;W[ns]C[White should not connect here else it is ko]
;B[pq]
;W[rs]
;B[mr]
;W[qs]
;B[ms]
;W[pr]))
(;B[pq]
;W[qs]
;B[ps]
;W[pr]C[This also a ko.])
(;B[rq]C[This is no good.]
;W[pq]
;B[pr]
;W[sq])
(;B[qs]C[Dropping to the edge doesn't help either]
;W[pq]
;B[pr]
;W[rq]
;B[mr]
;W[rs])
(;B[pr]C[This is the move that works by leaving black with the most liberties.]
(;W[qs]
;B[mr]C[Play can just calmly fill liberties.]
;W[ps]
;B[mq]
;W[ns]
;B[rs]C[He must not miss this move that catches white short.]
;W[ss]
;B[ms]
;W[rs]
;B[rq]
;W[sq]
;B[sp])
(;W[rq]C[Filling an outside liberty is too slow. ]
;B[mr]
;W[qs]
;B[mq]
;W[ns]
;B[ms]
;W[ps]
;B[rs])
(;W[ns]C[Connecting is two slow.]
;B[mr]
;W[ps]
;B[qs]
;W[rq]
;B[ms])))
