(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
AW[ih][jh][kh][hi][li][hk][jk][lk][jl]AB[ii][ji][ki][ij][kj]KK[^Bestiary^Symmetry]
(;B[jm]C[The key : only this move is successful]
(;W[ik]
;B[lj]
;W[mj]
;B[mi]
;W[lh]
;B[mk]
;W[nj]
;B[kk]
;W[ll]
;B[kl]
;W[km]
;B[lm]C[Playing this way, White cannot protect both sides])
(;W[kk]
;B[hj]
;W[gj]
;B[gi]
;W[hh]
;B[gk]
;W[fj]
;B[ik]
;W[hl]
;B[il]
;W[im]
;B[hm]C[It's a symetrical problem...]))
(;B[kk]C[If Black threatens the cuts]BM[1]
(;W[ll]C[White must not block, or else...]
;B[ik]C[Now,  black knock at the other door]
;W[hl]C[Not blocking again]
;B[kl]
;W[km]
;B[jm]
(;W[lj]C[White must protect, or else...]
;B[il]
;W[im]
(;B[jn]
;W[hj]
;B[jj]
;W[jl]
;B[jk]
;W[jl]C[snap-back])
(;B[jj]
;W[jl]
;B[jk]
;W[hj]C[This is known as dookori (bottleneck)]))
(;W[il]
;B[lj]
;W[mj]
;B[mi]
;W[lh]
;B[mk]
;W[nj]
;B[lm]))
(;W[kl]
;B[lj]
;W[mj]
;B[mk]
;W[ll]
;B[mi]C[Too many weaknesses])))