(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
AW[bp][cp][dp][ep][gq][cr][dr][er][fr][hr][hs]AB[bo][co][do][eo][ap][fp][gp][hp][ip][bq][cq][fq][iq][ir][bs][ds][es][fs][gs][is]KK[^Bestiary^Ishinoshita]
(;B[gr]C[A hard key to even imagine]
;W[cs]
;B[es]C[There is only one eye left in this space (see the end of the sequence)]
;W[ar]
;B[br]C[Now, the theme of problem 3]
;W[aq]
;B[as]
;W[aq]
;B[ar]
;W[dq]
;B[ao]
;W[aq]
;B[bq]
;W[fs]
;B[gr]C[another eye-destruction tesuji, but this one is quite frequent])
(;B[br]
;W[cs]C[capturing those  4 stones really make two eyes]
;B[eq]
;W[gr]
;B[dq]C[even if Black can then cut the uncuttable])
(;B[cs]
;W[br]
;B[ar]
;W[gr]
;B[dq]
;W[as]
;B[eq]C[similar to the previous sequence]))