(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[7.50]
PW[Kim Jiseok]PB[Guo Yuzheng]WR[9p]BR[4p]DT[2014-10-28]EV[16th Chinese City League A, round 17]SO[Go4Go.net]C[16th Chinese City League A, round 17
28th October 2014]RE[W+Resign]
;B[qd]
;W[dp]
;B[pq]
;W[dd]
;B[fc]
;W[cf]
;B[lc]
;W[qn]
;B[qp]
;W[pj]
;B[qh]
;W[on]
;B[pm]
;W[pn]
;B[mq]
;W[hc]
;B[qk]
;W[pk]
;B[qj]
;W[pi]
;B[ph]
;W[qi]
;B[ri]
;W[ql]
;B[oi]
;W[nj]
;B[ni]
;W[nc]C[First tenuki!]
;B[mj]
;W[rh]
;B[rj]
;W[op]
;B[oq]
;W[qc]C[Second tenuki!]
;B[pl]
;W[ok]
;B[qm]
;W[rm]
;B[rl]
;W[om]
;B[lm]
;W[ol]
;B[ql]
;W[pd]C[Third tenuki!]
;B[mk]
;W[lo]
;B[qe]
;W[rc]
;B[pe]
;W[od]
;B[dc]
;W[cc]
;B[ed]
;W[db]
;B[eb]
;W[ec]
;B[jo]
;W[mm]
;B[mn]
;W[ln]
;B[ml]
;W[km]
;B[nm]
;W[mo]
;B[kn]
;W[lq]
;B[jq]
;W[mr]
;B[np]
;W[no]
;B[kp]
;W[lp]
;B[kr]
;W[nr]
;B[nq]
;W[lr]
;B[ro]
;W[mi]
;B[li]
;W[mh]
;B[oh]
;W[qr]
(;B[pr]
(;W[rn]LB[pr:B][qr:A]C[With the exchange of A for B white made sure that this connection became sente.]
(;B[rr]C[Black came back to defend here in the game, but it was a mistake]
(;W[rs]C[In the game Kim Jiseok played this brilliant probe.]
;B[qq]
;W[ip]
;B[jp]
;W[jn]
;B[ko]
;W[nn]
(;B[jm]C[In the game black played here.
Why did black play here?]
(;W[kl]LB[jr:A]C[White extended!
Now A works again
]
;B[ll]C[Black elimated the ko]
;W[mm]
;B[nl]
;W[os]
;B[ps]
;W[ls]
(;B[kk]C[White lives now, black forces white to live with this move.
White needs to answer]
;W[qo]
;B[rp]
;W[ir]C[A forcing move before living]
(;B[jl]C[In the game black decided to eliminate all aji here.]
;W[dc]LB[pp:B][jr:A]C[However white now lives in sente, this was white's 4th tenuki!

A and B are miai.]
;B[fq]
;W[jr]
;B[cn]
;W[fp]
;B[gp]
;W[fo]
;B[kq]
;W[gq]
;B[eq]
;W[gr]
;B[dq]
;W[cp]
;B[cq]
;W[bq]
;B[br]
;W[bp]
;B[go]
;W[gn]
;B[ep]
;W[eo]
;B[do]
;W[ho]
;B[co]
;W[ge]
;B[ch]
;W[fr]
;B[bo]
;W[jc]
;B[le]
;W[eg]
;B[di]
;W[nf]
;B[jb]
;W[ib]
;B[jd]
;W[id]
;B[je]
;W[kc]
;B[kb]
;W[md]
;B[ld]
;W[mb]
;B[lb]
;W[if]
;B[mc]
;W[el]
;B[bf]
;W[cg]
;B[bg]
;W[cl]
;B[gg]
;W[bi]
;B[bh]
;W[ei]
;B[ej]
;W[fi]
;B[dk]
;W[dl]
;B[fj]
;W[gi]
;B[bj]
;W[hh]
;B[eh]
;W[fh]
;B[ce]
;W[de]
;B[hg]
;W[ih]
;B[df]
;W[dg]
;B[ig]
;W[jg]
;B[jf]
;W[hf]
;B[fg]
;W[ff]
;B[dh]
;W[ef]
;B[en]
;W[fn]
;B[fm]
;W[em]
;B[dn]
;W[gm]
;B[ii]
;W[kg]
;B[fl]
;W[cr]
;B[ap]
;W[fk]
;B[gl]
;W[gk]
;B[hl]
;W[ji]
;B[gj]
;W[hj]
;B[ij]
;W[hi]
;B[hk]
;W[nb])
(;B[dc]C[Black could also fight the ko]
;W[jl]C[But the aji here is big]
;B[in]
;W[il]LB[li:A][in:B]C[Black has been split and needs to look after two groups at A and B]))
(;B[pp]C[Black can not kill]
;W[jr]
(;B[ir]C[This does not work]
;W[js]
;B[kq]
;W[iq]
;B[io]
;W[ks]
;B[hr]
;W[ho]
;B[in]
;W[gq])
(;B[kq]C[Also not good]
;W[iq]
;B[ks]
;W[in]
;B[ir]
;W[io]
;B[js]
;W[hr]
;B[gr]
;W[hq]
;B[hs]
;W[fq]C[Black dies])))
(;W[os]
;B[ps]
;W[ls]LB[jm:A]C[Note that now this move is not sente on the lower side, because black has the stone at A.
]
;B[pp]
;W[jr]C[The clamp no longer works to create an eye on the lower side.]
;B[kq]LB[jm:A]C[Connecting here works because of A.]
;W[iq]
;B[ks]C[Black can simply cut])
(;W[mm]LB[jm:A]C[The drawback of A however is that there is a ko here.
]
;B[kl]C[Black can not fight this ko and has to capture here]
;W[nl]C[White can live!
However.. in the game white found an even better way to live.
Note that black ends in sente here.
Let's see how white in the game got sente AND lived.]))
(;B[ll]LB[mm:A]C[If black would play this move to make the ko at A less interesting for white...]
;W[os]
;B[ps]
;W[ls]
;B[pp]C[When black still tries to kill..]
;W[jr]C[White would be able to play this clamp and make life]
(;B[ir]
;W[js]
;B[kq]C[When black plays here now, it looks like white is seperated, but...white can cut!]
;W[iq]C[This cut is powerful.]
;B[io]
;W[ks]
;B[hr]
;W[ho]
;B[in]
;W[gq]C[White is alive and also has a lot of territory on the lower side.])
(;B[kq]LB[ll:A][jm:B]C[Why not just connect here?

Actually because of black's move at A, this does not work.
If the stone at A would have been played at B however, this does work.
]
;W[iq]
;B[io]
;W[ho]C[This reverts to the previous result.]
;B[in]
;W[ks]
;B[ir]
;W[js]
;B[hr]
;W[gq])))
(;W[ip]C[White has aji here, but needs to prepare it first]
;B[jp]
;W[jn]
;B[ko]
;W[nn]
;B[ll]
;W[os]LB[rs:A]C[When white did not find the good move at A.
And plays here without it black has an excellent answer]
;B[sp]LB[qo:A]C[A good move.
It prevents white from getting A in sente so white can not make an eye in that area.]
;W[ps]
;B[rq]
;W[ls]
;B[ir]C[White is dead here]))
(;B[jm]C[If black plays tenuki..it's risky.]
;W[rq]
;B[rp]
(;W[ps]C[Be careful! Playing this hane immediately is not good!]
;B[rs]C[Tesuji!]
;W[qs]
;B[os]
;W[or]
;B[rr]
;W[ns]
;B[qq]
;W[os]
;B[sq]C[Black lives and white is dead])
(;W[rs]C[Playing here first is important. Now it will be a ko.]
;B[sr]
;W[ps]
;B[os]
;W[or]
;B[qs]C[White has many local ko threats though.]
;W[rg]
;B[rf]
;W[ps]C[Like this, if white wins the ko, black's whole corner has been killed.]))
(;B[rq]C[This would have been better than the game though]
(;W[ip]
;B[jp]
;W[jn]
;B[ko]
;W[nn]
;B[ll]
;W[ls]
;B[ir]C[White dies])
(;W[pp]
;B[po]
;W[oo]
;B[qo]
;W[ps]
;B[rs]
;W[rr]
;B[os]C[White dies])
(;W[qo]
;B[pp]
;W[so]
;B[rp]
;W[rr]
;B[ps]
;W[rs]
;B[sr]
;W[sp]
;B[qs]C[Black creates a seki and white dies])))
(;W[ko]C[White is in a bad spot here. This is not working.]
;B[jn]
;W[kq]
;B[jr]
;W[jp]
;B[ip]
;W[io]
;B[hp]C[There is not much aji to exploit]))
(;B[rn]LB[ls:A]C[Why does black not play here? Because white can still live, because the descend at A remains sente for white.]
;W[or]
(;B[pr]
;W[ps]
;B[os]
;W[ns]
;B[rq]
;W[ip]
;B[jp]
;W[jn]
;B[ko]
;W[ls]C[This descend is still sente (see other variations).]
;B[jm]
;W[kl]
;B[ll]
;W[jr]C[White has this tesuji still.]
;B[ir]
;W[js]
;B[kq]
;W[iq]
;B[io]
;W[ks]
;B[hr]
;W[ho]
;B[in]
;W[gq])
(;B[qq]
;W[pr]
;B[rr]
;W[ip]
;B[jp]
;W[jn]
;B[ko]
;W[ls]LB[jr:A][qs:B]C[White can live because this is sente. A and B are miai.])))