(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Chinese]SZ[19]KM[6.50]
PW[Choi Cheolhan]PB[Zhou Ruiyang]EV[12th Nongshim cup]
;B[pd]
;W[dd]
;B[pq]
;W[dq]
;B[co]
;W[cj]C[A move Choi Cheolhan had been studying]
(;B[gp]LB[cl:A]C[Black tried a more flexible approach (than extending at A)]
;W[ep]
(;B[cl]
(;W[ip]C[A special move. Choi Cheolhan aims to create fighting shapes in which is is good]
;B[gn]
;W[en]
(;B[dk]
;W[dj]
;B[fk]
;W[dm]C[White has a good point here]
;B[cm]
;W[ek]
;B[el]
;W[ej]
;B[em]C[The players judged this shap differently. Black thought he was blocking of the centre, whereas white thought there were still cutting points on the outside for black.]
;W[cp]C[White had to make life]
(;B[gr]C[Black splits white in two.]
(;W[dn]
;B[dl]
;W[cn]C[White had to take gote here]
(;B[kp]C[Black needs to pincer here]
(;W[gl]
(;B[fl]
;W[il]C[This move was a bit slack of white and gave black a chance]
(;B[in]C[Black did fight back]
;W[gm]C[White had to cut now]
;B[fn]
(;W[gj]LB[fm:A]C[When white blocked here it ment that black was forced to connect on a dame point at A]
;B[fj]
;W[fi]
;B[gi]C[Black first created cutting points in white's position.]
;W[hj]
;B[fh]
;W[ei]
;B[fm]
(;W[jo]C[This move surprised everybody, even though the top is not settled yet, white continues to fight in the bottom area.]
;B[jm]C[The game got very difficult now]
;W[ko]
;B[lp]
;W[lo]
;B[mp]
;W[lm]
;B[jl]C[Black must go out here]
;W[lk]
(;B[kk]C[This was a skillful move]
;W[lj]
;B[gh]LB[dg:B][ii:A]C[Now black created a miai situation between between A and B]
(;W[ih]
(;B[dg]C[Although this move looks wonderful, Lee Sedol commented that it did help white too much!]
;W[cg]
;B[ch]
;W[dh]
;B[eh]
;W[bh]
;B[cf]
;W[ci]
;B[bg]
;W[ch]
;B[ef]C[White got sente and could go back to reinforce the center]
;W[ji]
;B[gk]
;W[hk]
;B[hi]
;W[ij]
;B[iq]
(;W[bf]LB[ho:A]C[White played here instead of using the cutting aji at A directly]
;B[be]
;W[ag]
;B[hp]C[Black needed to come back here which allowed white to attack the top]
(;W[fd]
;B[ce]
;W[bc]C[White creates territory while attacking]
;B[ge]
;W[fe]
;B[ff]
(;W[de]
(;B[gd]C[It was a good decision to sacrifice the three stones on the left for black]
;W[df]
;B[fc]
;W[hf]
;B[dc]LB[gf:A]SQ[fd][fe]C[Good timing before connecting at A.
Later the two marked white stones lose their value]
;W[ec]
;B[eb]
;W[ed]
;B[gf]
(;W[jd]C[A surprising move, again white plays at a big scale and tries to attack the whole black group]
(;B[id]
(;W[fb]
;B[gc]
;W[db]
;B[je]C[When black plays this hane it seems a big loss for white, but white had a plan.]
(;W[ke]C[This hane was a great idea]
;B[jf]
;W[kf]
;B[kd]
;W[ld]C[An amazing sacrifice by white]
;B[jc]
;W[kg]LB[kj:A]C[Suddenly black looks overconcentrated!
And white defended against the cut A.
This sequence was the highlight of the game

White got corner territory, protected the cut and made black overconcentrated. White is leading now.]
;B[lc]
;W[md]
;B[pf]
;W[mc]
;B[qi]C[The focus switches to the right side.]
;W[io]
;B[hn]
;W[mo]
;B[np]
;W[lb]
;B[jg]
;W[jh]
;B[kc]
(;W[pb]
(;B[nm]C[Black found this move, which showed he was behind. Black wants to make the right as big as possible]
(;W[on]C[White counter-attacked though!]
;B[om]
;W[pm]
;B[pl]
;W[ql]
;B[pk]
;W[pn]
;B[qk]
;W[qp]
;B[qq]
;W[rq]
;B[rr]
;W[ro]
;B[sq]
;W[rl]C[Black suffered a big loss on the side.]
;B[lh]
;W[kh]
;B[mf]
;W[oe]
;B[od]
;W[ne]
;B[pe]
;W[nb]
;B[er]
;W[dr]
;B[kj]
;W[li]
;B[mh]
;W[nk]
;B[nj]
(;W[qc]C[White played tenuki here, urging the game to an end]
(;B[jj]
;W[ii]
;B[rd]
;W[ng]
;B[mg]
;W[kl]
;B[ml]
;W[ll]
;B[nf]
;W[gb]
;B[bn]
;W[bo]
;B[rb]
;W[fq]
;B[ao]
;W[bp]
;B[kb]
;W[rc]
;B[sc]
;W[me]
;B[qb]
;W[jq]
;B[ir]
;W[jp]
;B[jk]
;W[ki]
;B[kr]
;W[jr]
;B[js]
;W[kq]
;B[lq]
;W[pc]
;B[oc]
;W[ob]
;B[pp]
;W[mk]
;B[ok]
;W[rp]C[White wins by resignation])
(;B[ki]C[Black could cut now]
;W[nf]LB[le:A]C[This protects against the cut at A]
;B[mn]C[this move looks clever, but black can not cut here]
;W[mm]
;B[nn]
;W[no]LB[nk:A]C[The peep at A is very useful, it prevents black from being able to cut.]))
(;W[ki]C[Black wants white to connect here]
;B[ob]C[After that black could wedge here]
;W[oc]
;B[qb]C[And black would take the corner]))
(;W[]
;B[ll]C[black aims to cut here]
;W[ml]
;B[mm]
;W[kl]
;B[km]C[black can create a ko])
(;W[mm]C[If white defends against the ko..]
;B[pm]C[Like this black is happy]))
(;B[qn]C[It is difficult to seal the right side for black]
;W[qk]C[White can still easily invade]))
(;W[qp]C[A common idea]
;B[qq]
;W[qm]))
(;W[kd]C[White can not extend here]
;B[ke]
;W[md]
;B[le]
;W[nc]
;B[kj]C[White has a problem in the center]
;W[ki]
;B[li]C[The cut becomes hard to handle]))
(;W[je]
;B[db]LB[cd:A][jd:B]C[This was black's plan, afterwards black has a big follow-up at A, because of this many professionals thought that white's move at A was too much, buyt white had a good plan]))
(;B[gc]
;W[db]C[Too easy for white, black is still in trouble with his big group]))
(;W[gc]C[How about cutting here instead?]
;B[fb]
;W[hc]
;B[cc]
;W[cd]
;B[id]C[Black is not dead in the corner yet and white is in trouble])
(;W[db]
;B[jd]LB[kj:A]C[Playing like this leaves a cutting point at A for black to aim at])
(;W[fb]
;B[gc]
;W[db]
;B[kj]LB[kd:A]C[Like this black can either cut aggressively here or again extend to A instead]))
(;B[df]C[If black would connect here]
;W[gd]
;B[he]
;W[hg]C[White takes away blacks eyes and black is in trouble,
this was white's plan]))
(;W[gd]C[pushing here now results in two eyes for black]
;B[he]
;W[hg]
;B[de]
;W[ee]LB[cc:A]C[It is hard to play here for white with the aji around A]))
(;W[ce]C[Cutting would be good, but white prefered to play on a bigger scale]))
(;W[ho]C[There was still aji in black's position]
(;B[hn]
;W[go]
;B[fo]
;W[fp]C[Black would be cut])
(;B[fp]
;W[hn])))
(;B[kj]C[This was Lee Sedol's suggestion]
(;W[ki]
;B[ji]
;W[jh]
;B[li]
;W[kh]
;B[hi]C[Black can cut here]
;W[ii]
;B[ij]
;W[jj]
;B[ik]C[White is in trouble])
(;W[hi]C[White needs to play here]
;B[li]C[And black will get this big hane on the head of two stones])))
(;W[ji]C[This move instead looks proper, but it has a drawback]
;B[dg]
;W[cg]
;B[ch]
;W[dh]
;B[eh]
;W[bh]
;B[di]
;W[ci]
;B[ii]C[Black can cut here now, and it will be difficult]
;W[hi]
;B[ih]
;W[ij]
;B[jj]
;W[hh]
;B[hg]
;W[ig]
;B[jh]
;W[gg]
;B[hf]
;W[gf]
;B[ge]
;W[he]
;B[if]
;W[fe]
;B[gd]
;W[ff]
;B[ik]C[Black can play here now to capture white]
;W[hk]
;B[jk]C[White has been captured]))
(;B[jj]C[If black plays here..]
;W[hi]
;B[gh]
;W[hh]C[White can fight, because black does not have many liberties whith his three stones]))
(;W[ih]C[Normally we can expect white to attack black now]
(;B[gh]C[When black connects, he becomes heavy.])
(;B[kn]C[If black does not want to get heavy]
;W[dc]C[Both players will build their own territory ])))
(;W[fm]C[When white cuts a difficult fight will follow]
;B[fj]
;W[hj]
;B[fh]
;W[dg]))
(;B[gm]
;W[in]C[What white is hoping for]))
(;B[fm]C[This response would be too painful for black]
;W[in]C[Now white can run out]))
(;W[in]C[Usually players try to run aways with weak stones]
;B[hk]C[Now black can protect, and white still needs to continue to run]
;W[kn]
;B[mp]C[Good for black, he creates territory while attacking])
(;W[gm]C[How about this keima]
;B[fn]C[The problem is black can cut white like this]
;W[fm]
;B[hm]
;W[gl]
;B[hk]
;W[hl]
;B[il]
;W[im]
;B[gk]
;W[hn]
;B[fl]
;W[hm]
;B[iq]C[Although white managed to cut the black group, black got influence and could connect underneath]))
(;B[hk]C[Slow for black]
;W[lp]C[White got too much in the lower right part of the board]))
(;W[]C[When white plays tenuki..]
;B[bp]C[Black will hane here]
;W[bq]
;B[bo]LB[cr:A]C[Now there is a peep at A]
;W[cr]LB[do:B][er:A]C[White will need to live, which is painful.
A and B are sente for black]))
(;B[dn]C[Capturing one stone is not attractive for black]
;W[gq]C[White can still connect underneath]))
(;B[el]C[Black can not jump here]
;W[dm]
;B[dl]
;W[cm]C[Good for white]))
(;W[cp]C[This move is natural and possible]
;B[do]
;W[eo]
;B[en]
;W[fn]
(;B[em]
;W[go]C[Even, black gets a stable group and white escapes into the center]
;B[ip])
(;B[fo]C[A tricky play, but an overplay]
(;W[gn]C[a dubious response]
;B[bp]
;W[bq]
;B[dp]C[Good for black])
(;W[dn]C[White can capture black's two stones, but it is not good enough]
;B[em]
;W[cn]
;B[bo]C[But black will gain forcing moves on the outside]
;W[bn]
;B[bm]
;W[ao]
(;B[gn]C[And captures white in a ladder]
;W[fm]
;B[fl]LB[nd:A]C[White will gain a ladder breaker around A though.])
(;B[dm]SQ[fn]C[Black can prevent white from getting a ladder breaker by capturing the marked stone in a net instead.]
;W[bp]
;B[cm]
;W[dp]
;B[gn]
;W[fm]
;B[gl]C[Black becomes very thick]))
(;W[bo]C[The simple hane is white's best move]
(;B[bn]C[black can not block here]
;W[dn]C[because white now cuts])
(;B[em]C[black must answer here]
;W[bn]C[Comparing this to the previous variation, black does not gain forcing moves on the outside]
;B[gn]C[On top of that black no longer has the net available.]
;W[nd]C[So white will gain a ladder breaker here.]
;B[fm]
;W[pf]C[Good for white])))))
(;B[jp]C[When black plays here]
;W[cp]LB[ck:A][cl:B]SQ[cj]C[White plays this kosumi.
Now it is good for white that the marked stones is far away, instead of for example at A or B.]))
(;B[cl]C[Also possible]
;W[cp]
;B[do]
;W[fq]C[But white is satisfied after this]))