(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play]AW[oo][po][qo][ro][np][sp][nq][rq][nr][rr][sr][ns]AB[pp][qp][rp][oq][qq][or][pr][qr][rs]
(;B[ss]C[This is self-atari so fails])
(;B[os]C[This threatens an eye, but White can throw in
making it false]
;W[qs]
;B[ps])
(;B[qs]C[This is the move as it threatens an edge eye or 
to catch the three white stones.]
(;W[os]
;B[ss]
(;W[so]
;B[sq])
(;W[sq]
;B[so]))
(;W[sq]
;B[os])))
