(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[9]KM[0.00]
PB[Noir]AW[dg][eg][fg][gg][hg]AB[hd][cf][df][ef][ff][gf][hf][cg][ch]
(;B[ei]
(;W[fi]
(;B[di]
;W[eh]
;B[gh]
;W[hh]
;B[ig]
;W[ih]
;B[hi]C[A classical way to kill])
(;B[fh]
;W[di]
;B[gi]
;W[dh]
;B[hh]
;W[ig]
;B[gh]
;W[ih]
;B[eh]
;W[hi]C[ indirect ko]))
(;W[fh]C[The  L-group is dead]
;B[fd]
;W[hh]
;B[gi]
;W[hi]
;B[fi])
(;W[ih]
;B[hi]))
(;B[fi]C[Here, the ogeima gives only a ko]
;W[ei]
;B[eh]
;W[dh]
;B[di]
;W[gi]
;B[gh]
;W[fh]
;B[hi]
;W[ei]C[ko])
(;B[di]C[This is also ko ; white must be careful]
(;W[ei]C[Only refutation]
;B[eh]
;W[gi]
(;B[hh]
;W[ih]
;B[hi]
;W[dh]
;B[fi]
;W[fh]
;B[gh]
;W[ei]C[ko])
(;B[fi]
;W[fh]
;B[hh]
;W[dh]
;B[ei]
;W[ih]
;B[hi]
;W[ci]))
(;W[eh]
;B[ei]
;W[fi]
;B[gh]
;W[hh]
;B[ig]
;W[ih]
;B[hi]))
(;B[dh]
;W[eh]C[long L group : mannenko]
;B[hh]
;W[ih]
;B[gh]
;W[hi]
;B[gi]
;W[ei]C[very indirect ko]))