(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[9]KM[0.00]
PB[Noir]AW[gc][ad][bd][cd][dd][hd][id][ee][fe][ge][dg][eg][fg][gg][ig][ah][bh][ch][gh][ih][hi][ii]AB[ae][be][he][cf][df][ef][ff][gf][hf][ag][bg][cg][hg][hh][bi]
(;B[dh]C[A multipurpose cut (yosumiru)]
(;W[di]
;B[eh]
(;W[ei]
;B[gi]
;W[fi]
;B[if]
(;W[gi]
;B[ci]
;W[fh]
;B[dh]
;W[ai]
;B[ci]C[Double snapback (moreover, white is dead)])
(;W[ci]
;B[gi]
;W[hi]
;B[ih]C[Both groups live ; Black needed to take 4 stones; 3 would still have left  her group with only one eye]))
(;W[fh]C[easier for black]
;B[if]C[white cannor connect]
;W[gi]
;B[fi])
(;W[fi]C[this defens]
;B[ci]
;W[ai]
;B[ci]C[is counterd by a simple snapback]))
(;W[eh]C[this direction ...]
;B[gi]
;W[fi]
;B[if]
;W[gi]
;B[di]C[White cannot approach and dies]))
(;B[gi]C[Though this cut appears in all variations, it must not be played too early]
;W[fi]
;B[if]
;W[gi]
;B[dh]
;W[di]
;B[eh]
;W[ci]C[White is alive])
(;B[fi]C[this kikashi only gives an extra liberty to White]
;W[gi]
;B[dh]
;W[eh]
;B[di]
;W[ei]))