(;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[lq][mq][nq][pq][kr][lr][or][pr][ms]AB[jp][lp][mp][np][op][pp][kq][oq][qq][jr][qr]
(;B[ps]C[Sometimes the hane kills.]
;W[nr]C[White plays here and lives.]
(;B[ks]
;W[os])
(;B[os]
;W[ks]))
(;B[ks]
;W[nr]
;B[ps]
;W[os]C[Again two eyes.])
(;B[nr]C[This is the correct play.]
(;W[ns]
(;B[ps]C[Now Black can play both hanes.]
;W[mr]
;B[ks])
(;B[ks]C[Black should not play here next.]
;W[ps]C[Two eyes.]))
(;W[mr]C[This does not stop both hanes.]
;B[ps]
;W[ns]
;B[ks])))
