(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play and kill]AW[rp][pq][rq][nr][or][qr]AB[qn][ro][np][op][pp][qp][mq][qq][mr][ms]
(;B[rr]C[Playing the 2-2 point to make use of the special property
of the corner is the tesuji here.]
(;W[sr]
;B[rs]
;W[qs]
;B[sp]
;W[ss]
;B[rr]C[Black throws in with this move. ]
;W[rs]
;B[so]
(;W[sq]C[White only gets one eye in the corner.]
;B[pr]C[And this throw-in takes the other eye away.]
;W[ps]
;B[ns]C[White's second eye is now false.]
(;W[oq]
;B[os])
(;W[os]
;B[oq]))
(;W[ps]C[Even if white plays here, or elsewhere, he cannot make 2 eyes.]
;B[ns]))
(;W[rs]C[White cannot play this atari ]
;B[sr]C[White has no good move now.]))
(;B[sp]C[If black just plays hane then white lives easily.]
;W[sr]))
