(;CA[utf-8]RU[Japanese]GM[1]FF[4]AB[pc][cr][le][qd][md][lf][mf][oc][mc][nc][oe]
[pe][qe][nf][ap][bp][cp][dp][aq][dq][bs]AW[re][kf][pf][lg][mg][ng][og][fn][bo][co]
[rc][ep][bq][eq][ar][br][er][do][mb][nb][ob][pb][qb][lc][jd][ld][nd][od][rd][ke]
[qf][ne]LB[jb:2][me:D][of:C][cm:1][dr:A][cs:B]AP[CGoban:3]SZ[19]ST[2]PB[B]PW[W]
KM[6.5]MULTIGOGM[1]

(;B[dr];W[ds]C[White removes black's potential for a second eye at C1];B[cs]C[Not needed now but let's imagine all external liberties are removed one by one...]
;W[es];B[];W[ao]C[Seki, there is nothing white can do except play inside which would give a life with points to black...]
;B[];W[cq]C[Mistake...];B[as];W[bq];B[br]C[Now black is alive with points. White should not have played inside.])
(;B[cs];W[dr]C[Now the A4 stones can be ataried when white wants. Note that the black group is dead as is so white will only proceed to actually remove the stones if need be.]
;B[ds];W[ao];B[cq];W[es];B[as];W[br])
(;B[of];W[qc]C[Seki. White can't do anything to black stones except playing atari inside, which would be a mistake since it will enable black to live with points...]
;B[jb];W[me];B[pd];W[nd];B[ne]C[Alive with points.])
(;B[me]C[Now black has a dead shape, white doesn't even need to add any moves for the black group to die. ]
(;W[of]C[But let's say he does for clarity's sake...]
(;B[qc];W[pd])
(;B[pd];W[nd])
(;B[jb];W[qc];B[pd];W[nd]))
(;W[pi];B[qc];W[ri];B[of];W[pd])))