(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play and live]AW[qm][rm][qn][po][pp][sp][pq][pr][qr]AB[rn][sn][qo][qp][qq][rr]C[Presuambly white has just played inside black's group, so black has to be careful.

Note that diagram 7 shown on p43 is not the solution.]
(;B[sq]C[If black plays here white cuts with black short of liberties.]
;W[ro])
(;B[rp]C[Playing here is the correct move.]
(;W[sq]C[If white plays here...]
(;B[sr]C[...black could block.

]
(;W[sm]C[When white threatens a snap-back...]
;B[rq]C[...black here stops it and black is alive]
(;W[rs]
;B[so]C[This is the sequence shown in diagram 7 on p43.
However white can play differently.])
(;W[so]
;B[ro]
(;W[sp]
;B[rs])
(;W[rs]
;B[sp])))
(;W[so]C[However white can play here, which refutes the previous
black move as being correct.]
(;B[rq]C[If black connects...]
;W[rs]C[...white takes away the corner eye and black is dead.])
(;B[rs]C[If black makes the corner eye...]
;W[sm]C[... white plays here and black is short of liberties.])))
(;B[so]
;W[sm]C[Black is short of liberties.])
(;B[rq]C[This is the correct response for black. 
White cannot kill now.]
(;W[sm]
;B[sr]
;W[so]
;B[ro]
(;W[sp]
;B[rs])
(;W[rs]
;B[sp]))
(;W[rs]
;B[so]
(;W[sm]
;B[sr])
(;W[sr]
;B[ss]
;W[sr]
;B[sq]))
(;W[sr]
;B[rs]
;W[sm]
;B[ss])
(;W[so]
;B[rs]
;W[sm]
;B[ro])))
(;W[sr]C[If white plays here, black can still get it wrong.]
(;B[so]C[This is the correct response.]
;W[rs]
;B[rq]
;W[sm]
;B[sq])
(;B[rq]C[This is wrong]
(;W[rs]C[White will not revert to the previous shape with this.])
(;W[sm]C[He will threaten the snap-back again]
;B[sq]
(;W[rs]C[White will not play here next...])
(;W[so]C[But white will do this.]
;B[ro]
;W[rs]C[And kill black.]))))))
