(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
AW[cn][dn][bo][bq][cq][br][dr][ds]AB[do][bp][cp][dq][eq][cr][er][es]
(;B[cs]C[If Black takes the stones in atari, White can connect the others to the outside.]
;W[ap]
;B[bs]
;W[aq])
(;B[ap]C[If Black prevents the connection, White will live.]
;W[cs]
;B[aq]
;W[ar])
(;B[ar]C[Again, White can live.]
;W[aq]
;B[bs]
(;W[ap]C[But White can't try to connect yet.]
;B[ao])
(;W[cs]C[This has the same problem.]
;B[cr])
(;W[as]
(;B[cs]C[If Black takes the stones, now White can connect to the outside.]
;W[ap]
;B[ar]
;W[ao])
(;B[ss]C[Black could go for the rest of the stones by playing a ko fight.

Imagine this is a ko threat ...]
;W[rr]C[...to which White responds.]
;B[ar]C[So Black takes the ko.]
;W[qq]C[White makes a ko threat.]
;B[ap]C[If this is better than defending against White's threat, Black can win the ko.])))
(;B[bs]C[This is the solution: Black sets up a snapback.]
(;W[cs]
;B[cr]
;W[ap]C[White cannot escape this way.]
;B[ar]
;W[aq]
;B[ao])
(;W[ap]C[Neither can white escape by connection along the edge.]
;B[ar]
;W[cs]
;B[cr])))
