(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[7.50]
PW[Kim Cheayoung]PB[Yu Zhiying]WR[3p]BR[6p]DT[2018-05-01]EV[1st Go Seigen Cup World Women's Championship, semi-final]SO[Go4Go.net]RE[W+0.50]
;B[pd]
;W[dd]
;B[pq]
;W[dp]
;B[pn]C[very modern]
;W[fq]
;B[fc]
;W[qc]C[also very modern...]
;B[pc]
;W[qd]
;B[qf]
;W[qe]
;B[pe]
;W[rf]
;B[cf]
;W[df]
;B[dg]
;W[ef]
;B[cd]
;W[cc]
;B[ce]
;W[dc]
;B[gd]
;W[gf]
;B[ci]
;W[ie]
;B[ic]
;W[kd]
;B[kb]
;W[pf]
;B[qg]
;W[rg]
;B[qh]
;W[of]
;B[qb]
;W[rb]
;B[ob]
;W[qa]
;B[oh]
;W[mf]
;B[eb]
;W[mh]C[nice life and death problem in the top left now]
;B[de]
;W[ee]
;B[ed]
;W[bd]
;B[be]
;W[db]
;B[eg]
;W[ge]
;B[bb]
;W[bc]
;B[ec]
;W[ae]
;B[bg]
;W[ba]C[a ko for life!]
;B[ca]
;W[da]
;B[aa]
;W[cb]
;B[gp]
;W[kp]C[more alphagoey stuff]
;B[mq]
;W[fp]
;B[gn]
;W[cm]
;B[lc]
;W[ql]LB[pp:A]TR[mq]C[Not sure how the follow up at A will work with the marked stone in place]
;B[pk]
;W[pl]
;B[ok]
;W[ol]
;B[mk]
;W[nl]
;B[nk]
(;W[qp]LB[pp:A]C[so why not A? See some of my variations, I think it's actually not the best choice here given N3]
;B[qq]
;W[qn]
;B[pp]
;W[qo]
;B[ki]C[leaning on white's group to strengthen the centre group]
;W[nc]
;B[nd]
;W[od]
;B[oe]
;W[ne]
;B[oc]
;W[md]
;B[nb]
;W[kg]LB[le:A]C[so black gets sente out of L11 and leaves some aji behind as well]
;B[gq]C[a huge move that might also affect the corner]
(;W[lm]C[necessary]
;B[cp]C[but black gets to exploit the corner weakness]
;W[co]
;B[dq]
;W[bp]
;B[cq]
;W[fo]
;B[do]
;W[bo]
(;B[dn]
;W[ep]
;B[dm]
;W[bq]
;B[go]
;W[fn]
;B[cl]
;W[bm]
;B[fm]C[by sacrificing the corner black gets a nice looking outisde]
;W[lj]C[but it won't last long...]
;B[lk]
;W[kj]
;B[kk]
;W[jj]
;B[jk]
;W[ij]C[oops...black's centre seems to have come to nothing... at least nothing in sente!]
;B[nn]
;W[mp]
;B[np]
;W[mm]
;B[gr]
;W[er]
;B[rk]
;W[rl]
;B[ik]
;W[lq]
;B[mo]
(;W[kn]
;B[lp]
;W[kq]
;B[hj]
;W[hi]
;B[gi]
;W[hh]
;B[gh]
;W[in]
;B[hm]
;W[ck]
;B[dl]
;W[bl]
;B[hg]
;W[ig]
;B[gg]
;W[hf]
;B[ld]
;W[le]
;B[dk]
;W[cj]
;B[dj]
;W[bi]
;B[bh]
;W[ba]
;B[mc]
;W[jc]
(;B[id]C[wat... I don't get it - see variaitions, I really can't see anything that stops black playing K18...

I can see that black can't be disconnected ]
;W[jb]
;B[ib]
(;W[jd]
;B[ja]
;W[rq]
;B[rr]
;W[rp]
;B[ca]C[that's a bloody big ko... but a two-step one for black it seems]
;W[di]
;B[ch]
;W[ba]
;B[me]
;W[lf]
;B[ca]
;W[fg]
;B[fh]
;W[ba]
;B[mi]
;W[li]
;B[ca]
;W[gj]
(;B[hk]
;W[ba]
;B[je]
;W[ke]
;B[ca]
;W[mr]
;B[nr]
;W[ba]
;B[pa]
;W[ra]
;B[ca]
;W[ff]
;B[eh]
;W[ba]
;B[cn]
;W[bn]
;B[ca]
;W[ka]
;B[la]
;W[ba]
;B[lh]
;W[mj]
;B[ni]
;W[kh]
;B[ca]
;W[af]
;B[ea]
;W[ba]
;B[ih]
;W[ii]
;B[ca]
;W[ab]
;B[ac]
;W[ad]C[so now white lives in double ko ]
;B[nf]
;W[sr]
;B[rs]
;W[qk]
;B[qj]
;W[ri]
;B[rj]
;W[rh]
;B[lr]
;W[kr]
;B[ms]
;W[qi]
;B[pi]
;W[ng]
;B[nh]
;W[mg]
;B[og]
;W[ir]
;B[ip]
;W[jp]
;B[iq]
;W[po]
;B[oo]
;W[ai]
;B[bf]
;W[ba]
;B[jm]
;W[jn]
;B[ln]
;W[km]
;B[pm]
;W[sl]
;B[si]
;W[sh]
;B[sj]
;W[hr]
;B[hs]
;W[im]
;B[il]
;W[jl]
;B[kl]
;W[ko]
;B[io]
;W[lo]
;B[mn]
;W[rn]
;B[fr]
;W[cr]
;B[es]
;W[ds]
;B[hq]
;W[jr]
;B[fs]
;W[ab]
;B[qm]
;W[rm]
;B[en]
;W[dr]
;B[nj]
;W[jh]
;B[pg]
;W[pb]
;B[nm]
;W[ml]
;B[qb]
;W[om]
;B[on]
;W[pb]
;B[bk]
;W[bj]
;B[qb]
;W[hn]
;B[ho]
;W[pb]
;B[ak]
;W[al]
;B[qb]
;W[pj]
;B[oj]
;W[pb]
;B[ah]
;W[aj]
;B[qb]
;W[sk]
;B[pj]
;W[pb]
;B[bk]
;W[ak]
;B[qb]
;W[of]
;B[ne]
;W[pb]
;B[re]
;W[rd]
;B[qb]
;W[gm]
;B[gl]
;W[pb]
;B[eo]
;W[eq]
;B[qb]
;W[qr]
;B[pr]
;W[pb]
;B[se]
;W[sd]
;B[qb]
;W[hd]
;B[hc]
;W[pb]
;B[he]
;W[if]
;B[qb]
;W[ks]
;B[pb]
;W[ls]
;B[mr]
;W[is]
;B[hd]
;W[mp]
;B[gs]
;W[lp]
;B[jm]
;W[op]
;B[oq]
;W[jl]
;B[sq]
;W[sp]
;B[jm]
;W[sq]
;B[jl]
;W[fe]
;B[fd]
;W[ss]
;B[qs]
;W[ag]
;B[kc]
;W[ll]
;B[jo]
;W[jq]C[White by just half a point! ])
(;B[ad]C[for example]
;W[ba]C[still a ko])
(;B[ba]
;W[ab]C[not good enough obviously]))
(;W[ja]
;B[jd]
;W[kc]
(;B[ke]
;W[je]
;B[ia]
;W[kf]
;B[ka]
;W[ke]
;B[lb]
;W[gb]C[what  now])
(;B[je]
;W[ke]
;B[jf]
;W[if]
(;B[jh]
;W[jg])
(;B[gb]
;W[jg]C[the only possible variation if white plays K19 - it seems this is actually better for black, I suppose some pretty impeccable counting is needed to see this]))))
(;B[jb]
(;W[hc]
(;B[hd]
;W[ib]
;B[id]
;W[gb]
(;B[jd]
(;W[je])
(;W[ea]
;B[je]
;W[jf]))
(;B[gc]
;W[hb]
;B[ea]))
(;B[hb]
;W[gc]
;B[gb]
;W[hd]))
(;W[gb]
;B[hb]
;W[ea])
(;W[ib]
;B[hb]
;W[hc]
;B[ia]
;W[gb]
(;B[gc])
(;B[hd]))))
(;W[lp]
;B[lo]
;W[ko]
;B[kn]
;W[jn]
;B[km]C[oh dear...]))
(;B[bq]
(;W[er]
;B[ep]
;W[dn]
;B[eo]
;W[en]
;B[eq]
;W[fn]
;B[gr]
;W[fr]
;B[dr]C[I spent little to no time reading any of this but I think black can live in the corner, unfortunately the outside looks terrible...])
(;W[ep]
;B[er]
;W[fr]
;B[dn]
;W[fn]
;B[dm]
;W[cl])))
(;W[cp]
;B[mn]C[White cannot let black have the next move in this area]))
(;W[pp]
(;B[qq]
(;W[qp]
;B[op]C[not great...])
(;W[oq]
(;B[op]
;W[np]
;B[oo]
;W[nq]
;B[no]
;W[mp]
;B[ml]
;W[rn]
;B[qo]
;W[qj]C[should be ok for white a move around H/J3 becomes big for both])
(;B[or]
;W[qp])))
(;B[qp]
;W[qq]
;B[oq]
(;W[rp]
;B[qo]
;W[qr]
;B[ro]
;W[sq]
;B[lm]C[not great])
(;W[qo]
;B[rp]
;W[po]
;B[ro]C[also not great]))))