(;GM[1]FF[4]SZ[19]AP[SmartGo:0.9.0.1]CA[UTF-8]GN[202cx rmh]AB[jo][ko][lo][mo][no][oo][ip][iq][mp][pp][rp][lq][qq][hr][jr][rr]
[rs][is][ks]AW[kp][lp][op][oq][mq][mr][ms][kr][lr][pr][qr]C[Black to play and kill]
(;B[or]C[This is the correct first play.]
(;W[os];B[nr];W[nq];B[pq]
(;W[ns]
;B[or]C[After this throw-in White cannot make two eyes];W[ps]
;B[kq]C[Note this is not an eye for White now.];W[jq];B[kq])
(;W[kq]
(;B[ps];W[ns];B[or])
(;B[qs]C[Black mistake.];W[ns])))
(;W[nr]C[If White tries this atari instead.];B[os];W[ps];B[pq];W[ns]
;B[or]C[Then again the throw-in here stops two eyes.]))
(;B[nr]C[This is wrong.]
(;W[or]C[White can make two eyes.])
(;W[os]C[White mistake.];B[or]C[Reverts to the correct line.])))
