(;SZ[9]AW[df]AW[cg]AW[eg]AW[fg]AW[gg]AW[hg]AW[ig]AW[ch]AW[ih]AW[di]AW[ii]AB[ce]AB[de]AB[ee]AB[ge]AB[bf]AB[ef]AB[hf]AB[bg]AB[bh]AB[bi]AB[ci]GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]KM[0.00]PB[Noir]
(;B[dh]C[The cut is the only way to rediuce the space]
(;W[eh]C[The cut is the only way to rediuce the space];B[ei];W[fi]
(;B[gh];W[di]C[This is actually the right answer : White lives in koRIGHT])
(;B[di];W[gh];B[dg]C[RIGHT];W[if]C[RIGHT];B[ie];W[gf];B[he];W[ff];B[fe]C[RIGHT]))
(;W[ei]C[If White is not aware of the danger];B[eh];W[fi];B[fh];W[gi];B[gh];W[hi];B[dg]C[he is killed by this surprising sacrifice];W[hh]C[he is killed by this surprising sacrifice]
(;B[fh]
(;W[eh];B[dg];W[dh];B[cf]C[using next this classical reduct-on of eyeRIGHT])
(;W[cf];B[dh];W[dg];B[eh]C[also deadRIGHT]))
(;B[dg];W[dh]C[the order of moves is essential : here, white lives])))
(;B[cf];W[dg];B[ei]
(;W[dh]C[CHOICE];B[gi];W[gh];B[hi];W[fi];B[fh];W[hh];B[if];W[eh];B[gf];W[fi];B[ff]C[RIGHT])
(;W[fi];B[dh];W[eh]
(;B[gh];W[di])
(;B[gi];W[di])
(;B[ff];W[di])
(;B[gf];W[di])
(;B[fh];W[di])
(;B[hh];W[di])
(;B[hi];W[di]))
(;W[eh];B[dh];W[fi]
(;B[gh];W[di])
(;B[gi];W[di])
(;B[ff];W[di])
(;B[gf];W[di])
(;B[fh];W[di])
(;B[hh];W[di])
(;B[hi];W[di]))))