(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[9]KM[0.00]
PB[Noir]AW[cg][dg][eh][fh]AB[cd][cf][df][eg][fg][gg][gh]
(;B[bf]
(;W[bh]C[The hardest to counter resistance]
(;B[fi]
(;W[di]
;B[gi]C[This third slow  tesuji  is the only way to kill unconditionally]
(;W[bg]
;B[ag]
;W[ah]
;B[bi]
;W[ci]
;B[dh])
(;W[ci]
;B[bg]
;W[ah]
;B[dh])
(;W[bi]
;B[ah])
(;W[ch]
;B[ei])
(;W[ag]
;B[bg]
;W[bi]
;B[ah]
;W[ch]
;B[ei]))
(;W[dh]
;B[ci]
;W[bg]
;B[ag]
;W[ah]
;B[bi])
(;W[ch]
;B[ei]))
(;B[di]
;W[ci]
;B[dh]
;W[ch]
;B[ah]
;W[ag]
;B[bg]
;W[ai]
;B[af]
;W[ei]
;B[ah]C[ko])
(;B[dh]
;W[di]
(;B[fi]
;W[ch]
;B[ah]
;W[bi])
(;B[ah]
;W[ch]
;B[bi]
;W[fi]))
(;B[ci]
;W[di]
;B[ch]
;W[fi]
;B[bg]
;W[dh]))
(;W[bg]
;B[fi]
(;W[di]
;B[ag]
;W[ah]
;B[bi]
;W[bh]
;B[gi]
;W[ci]
;B[dh])
(;W[dh]
;B[ei]C[The L-group is dead]
(;W[ag]
(;B[bh]
;W[di]
(;B[bi])
(;B[gi]C[Serious mistake]
;W[bi]
;B[ah]
;W[ch]))
(;B[di]C[But Black must not start by reducing the space in this case]
;W[ci]
;B[bh]
;W[gi]))
(;W[di]
;B[ag]
;W[ah]
;B[bi]
;W[gi]
;B[fi])
(;W[bh]
;B[ci]
;W[di]
;B[ag]
;W[ah]
;B[bi])
(;W[bi]
;B[ah]
;W[ag]
;B[bh]
;W[di]
;B[ch]
;W[gi]
;B[fi]C[Still dead])))
(;W[ah]
;B[bi]
(;W[bg]
;B[fi]
;W[di]
;B[ch]C[Not a seki])
(;W[bh]
;B[fi]
(;W[di]
;B[gi]
;W[ci]
;B[dh]C[Always the same shape])
(;W[dh]
;B[ci]
;W[ei]C[White is already dead]))
(;W[ch]
;B[fi]
;W[di]
;B[gi]C[Always the same tesuji]))
(;W[ci]
;B[bh])
(;W[di]C[Beware of the trap]
(;B[fi]C[Only refutation, back to previous variations]
(;W[bg]
;B[ag]
;W[ah]
;B[bi]
;W[bh]
;B[gi]
;W[ci]
;B[dh])
(;W[bh]
;B[gi]C[This third slow  tesuji  is the only way to kill unconditionally]
(;W[bg]
;B[ag]
;W[ah]
;B[bi]
;W[ci]
;B[dh])
(;W[ci]
;B[bg]
;W[ah]
;B[dh])
(;W[bi]
;B[ah])
(;W[ch]
;B[ei])
(;W[ag]
;B[bg]
;W[bi]
;B[ah]
;W[ch]
;B[ei])))
(;B[bh]
;W[ch]
;B[fi]
;W[bg]
;B[ag]
;W[ah]
;B[ai]
;W[bi]
;B[ci]C[White gets a ko])))
(;B[bg]
;W[bh]
(;B[ah]
;W[bf]
;B[af]
(;W[ch]
(;B[di]
;W[be]
;B[dh]
;W[ae]C[White lives])
(;B[be]
;W[di]C[White lives]))
(;W[ag]C[Ko]
;B[gc]
;W[fc]
;B[bg]
;W[be]
;B[ch]
;W[ag]))
(;B[bf]
;W[ah]C[White lives]
(;B[fi]
;W[dh]
;B[ci]
;W[bi]
;B[ei]
;W[ch])
(;B[ci]
;W[ch]
(;B[fi]
;W[di]
;B[gi]
;W[bi]
;B[ei]
;W[gc]
;B[dh]
;W[eh])
(;B[di]
;W[bi]
;B[fi]
;W[dh]))
(;B[di]
;W[ci]
;B[fi]
;W[dh]))))