(;GM[1]FF[4]SZ[19]AP[SmartGo:0.8.8]CA[UTF-8]
GN[182cx]
AB[ol][lm:lp][mm][pm:po][op:oq][qp][kq][mq:mr][rq:rr]
AW[mn:mp][nn:on][oo][np:nr][qq:qr][or]
C[Black to play and kill.]
(;B[pr]
C[Wedging sometimes works.];W[pq];B[pp];W[ps]
C[But not here.])
(;B[pq];W[pr];B[pp];W[qs]
C[This way fails too.])
(;B[ns];W[pq];B[pp];W[ps]
C[This fails too.])
(;B[qs]
C[This hane is the move that kills.];W[ps]
C[If White here...];B[pp]
C[...then Black connects.]
(;W[ns];B[pr])
(;W[rs];B[pq]
(;W[pr];B[ns])
(;W[ns];B[pr]))
(;W[pr];B[ns]))
(;B[pp]
C[Too hasty];W[qs]))

