(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
AW[cn][dn][bo][do][ap][dp][ep][eq][br][cr][dr][bs]AB[co][cp][aq][bq][cq][dq][fq][ar][er][fr][ds]C[White would like to play at b4 to reduce Black to one liberty.]
;B[bn]C[The solution: this cut gives Black just enough time to play the preparatory move he needs at e1.]
(;W[bm]
;B[es]
;W[an]
;B[cs]
;W[bp]C[Too late.]
;B[as])
(;W[an]
(;B[es]
;W[bm]
;B[cs]
;W[bp]
;B[as])
(;B[bm]C[This way white loses more.])))
