(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]
PW[Lee Sedol]PB[Cho Hanseung]WR[9p]BR[9p]DT[2014-01-13]C[This is the Korean Guksu Tournament Finals.
Cho Hanseung has successfully defended his title for the past two years now.
Lee Sedol has had the worst year of his career thus far last year, winning zero international and domestic tournaments. However he has been looking to recover. 
The score is at 2-1 right now in favor of Cho, if he wins one more, he will successfully defend his title for the third time.]RE[B+Resign]BC[kr]WC[kr]
;B[pd]
;W[dp]
;B[qp]
;W[dc]
;B[oq]LB[qf:C][ch:B][ci:A][qj:D]C[This is a popular opening recently with many variations.
White has 4 popular choices.]
(;W[qf]LB[nc:C][pi:B][qi:A]C[A and B are popular pincers.
A more passive approach is at C]
;B[nc]
(;W[qj]C[This is popular. White is seeking to play a slow game and avoids all complicated variations.]
;B[qh]LB[rh:A]C[A is the most popular choice.]
(;W[qo]C[White is seeking to gain sente here.
A very active approach.]
;B[po]
;W[qn]
;B[rp]
;W[pn]
;B[oo]
;W[fq]C[Even thus far.]
;B[de]
;W[ce]
;B[cf]
;W[cd]
;B[dg]
;W[ef]C[A probing move.
]
;B[eg]
(;W[bf]C[The only move for white now]
;B[gf]
(;W[bg]C[White takes territory while black likes influence.]
;B[qe]
;W[pf]C[A slightly heavy move.
It is quite aggressive and black will try and attack these two stone heavily.
I personally would not play this because black already has thickness on the left side.]
(;B[oh]C[But pros always seem to jump instead.]
;W[oj]
;B[nf]LB[rh:A]C[White is slightly in trouble here.
But Lee Sedol is known to be great in situations like this.
There is still aji at A to connect underneath]
;W[oe]
;B[md]
;W[od]
;B[oc]
;W[qc]C[White's only option.]
;B[re]
;W[rh]LB[rf:A][rg:B][ri:C]C[The fighting here is quite difficult.
Let's break down some possible choices.
A, B and C.]
(;B[rg]C[Best choice.]
;W[qg]
;B[ri]
;W[ph]
(;B[sh]
;W[qi]
;B[pc]LB[pi:A]C[Overall a successful result for black here.
White still has a heavy ko left here at A and black secured territory as well as influence.]
(;W[rh]C[White protects against the ko. This is a must.]
;B[gc]C[But black gets to play on the huge point.]
(;W[rf]C[This is gigantic!]
;B[jp]
;W[se]C[White seems obsessed with this corner. But luckily he ends in sente this time.]
;B[sd]
;W[sf]
;B[rc]
;W[ke]LB[me:A]C[Very aggressive move.
Lee Sedol thinks that the left side is not so big. So he invades. It also aims at the aji at A. Black's shape is not optimal. ]
(;B[hq]LB[ke:A]C[Theres no good move to attack A, so black just plays what's big.
]
(;W[nm]
;B[bp]
;W[cp]
;B[bo]
;W[bq]
(;B[cm]C[This prevents all nasty things, allthough it feels slow.]
;W[ck]C[Let's do a rough estimate.
Black has around 30 on the bottom, 20 on the top,
and 5 on the left.
White has around 25 on the left, and 25 on the right.

The game is still in balance, but black has more potential to expand his territory.
]
;B[em]
;W[hr]LB[br:A]C[Also a probing move. White aims to defend the weakness at A.]
;B[gr]
;W[gq]
;B[ir]
;W[hp]
(;B[hs]C[Black fights back.]
;W[iq]
;B[jq]
;W[hr]C[Black doesn't have obvious ko threats.]
;B[br]LB[jr:A]C[White however can't start the ko at A either because there are no ko threats.

]
(;W[cq]C[White should answer.]
;B[hq]
;W[ek]C[Not a big enough ko threat.]
;B[ip]
;W[gm]
;B[eo]C[Shape move.
If black settles here, black will extend his lead.
This group is impossible to capture for white.]
;W[ap]
;B[ho]
;W[dn]
;B[do]
;W[co]
;B[cn]
;W[fo]
;B[fn]LB[gn:A]C[White would like to block at A, 
but]
(;W[ep]
;B[en]LB[an:B][gn:A]C[Locally a good result for black.
Black was able to settle his group locally and strengthen his territory on the bottom.

Going out at A or living with B are miai.]
;W[jc]
;B[ed]
;W[ec]
;B[fd]
;W[lc]
;B[sm]C[Big. ]
;W[rm]
;B[di]
;W[gk]
;B[jg]
;W[lg]
;B[ji]
;W[if]C[Black just needs to secure off his territory and groups.
The board is getting smalled and there is not much for white to possibly profit from.]
;B[ig]
;W[bn]
;B[bm]
;W[ao]
;B[gn]
;W[dl]
;B[dm]
;W[bi]
;B[mn]
;W[nn]
;B[no]
;W[mm]
;B[ln]
;W[me]LB[ld:B][ne:A]C[White's last attempt.
Black cannot pull the two stones out directly..
Let's look at why A and B does not work.]
(;B[li]C[Correct choice.
Black is ahead, after counting, Cho realizes a little bit of sacrifice is okay as long as he keeps the lead.]
;W[mi]
;B[lf]C[Tesuji.]
;W[kf]C[White has to choose the most aggressive variation here.]
;B[mf]
;W[kg]
;B[le]
;W[hg]C[Again white is looking for black to make a mistake,
but this should be easy for Cho.]
;B[hf]
;W[hh]
;B[kl]
;W[jh]
;B[ih]
;W[ii]
;B[kh]
;W[jf]
;B[jh]
;W[hi]
;B[jk]
;W[ld]
;B[ne]
;W[he]
;B[ge]
;W[hd]
;B[fc]LB[ib:B][ff:A]C[The left side is locally alive.
A and B are miai]
(;W[il]C[At this point it's game over. ]
;B[ib]
;W[in]
;B[lm]
;W[hc]
;B[hb]
;W[fb]
;B[gb]
;W[eb]
;B[jb]
;W[kb]
;B[mb]
;W[mc]
;B[of]
;W[nb]
;B[na]
;W[lb]
;B[ob]
;W[lk]
;B[ij]
;W[fh]
;B[mh]
;W[pe]
;B[nd]
;W[lj]
;B[ni]
;W[mj]
;B[lh]
;W[jd]
;B[ga]
;W[sn]
;B[nj]
;W[nk]
;B[oi]
;W[pj]
;B[fl]
;W[ei]
;B[eh]
;W[hj]
;B[gl]
;W[ik]
;B[ll]
;W[ch]
;B[dh]
;W[dj]
;B[fg]
;W[er]
;B[ml]
;W[mk]
;B[nl]
;W[ol]
;B[ci]
;W[cg]
;B[df]
;W[bl]
;B[cj]
;W[bj]
;B[fj]
;W[fk]
;B[ej]
;W[el]
;B[gh]
;W[hm]
;B[fm]
;W[gp]
;B[io]
;W[jn]
;B[cl]
;W[dk]
;B[al]
;W[bk]
;B[ko]
;W[og]
;B[fr]
;W[fs]
;B[so]
;W[ro]
;B[rn]
;W[sp]
;B[sq]
;W[sn]
;B[sp]
;W[fa]
;B[rn]
;W[qd]
;B[rd]
;W[sn]
;B[go]
;W[sl]
;B[fp]
;W[qb]
;B[rb]
;W[fo]
;B[ok]
;W[pk]
;B[fp]
;W[ra]
;B[pb]
;W[fo]
;B[on]
;W[om]
;B[fp]
;W[eq]
;B[am]
;W[gi]
;B[fi]
;W[gg]
;B[hl]
;W[hk]
;B[ak]
;W[aj]
;B[an]
;W[bo]
;B[ic]
;W[id]
;B[fh]
;W[kj]
;B[jj]
;W[ja]
;B[ia]C[Overall a great performance by Cho Hanseung,
Lee Sedol had no chances of catching up after falling behind in the opening.
We usually call these kinds of games a "Perfect Win",
where no little to no mistake was made and one player held his lead until the end of the game.
We often ask how should we play after we are leading, and this game is a clear example of how one should play in that circumstance.

Congratulations to Cho Hanseung on defending his title.])
(;W[hb]
;B[ff]
;W[ee]
;B[fh]
;W[ei]
;B[gg]C[Black lives.]))
(;B[ld]
;W[le]
;B[kd]
;W[jd]
;B[je]
(;W[hb]LB[gb:B][jf:A]C[This is the key move.
A and B are miai now]
;B[jf]
;W[gb]C[Black gains nothing.])
(;W[jf]
;B[ie]
;W[he]
;B[id]
;W[hd]
;B[ic]
;W[hc]
;B[ib]
;W[hb]
;B[jb]
;W[kc]
;B[mc]C[The ladder does not work for white directly.]))
(;B[ne]
;W[nd]
;B[mc]
;W[le]SQ[ne][nf][oh]C[Black's stones are in too much danger.
Definitely not a good choice.]))
(;W[gn]
(;B[ep]
;W[eq]
;B[fp]C[Black can connect.])
(;B[go]LB[fl:A]C[This would be the wrong response, now black cannot escape though A.]
;W[fp]
;B[fl]
(;W[fm]
;B[en])
(;W[gl]
;B[fk]
;W[fm]
;B[en]
;W[el]C[Black cut.]))))
(;W[hq]
;B[cq]
;W[jr]
;B[kr]
;W[is]LB[cm:A]C[This result is good for black. The group at A is strong now.
So white should answer the ko threat.]))
(;B[iq]C[White is hoping for this.]
;W[fr]
;B[br]
;W[aq]C[Clamp no longer works.]))
(;B[cl]C[This is also considered normal, but Go Seigen, with almost a 100 years of experience, doesn't like it! ]
(;W[cn]
;B[bn])
(;W[cj]C[This is also nasty]
(;B[dn]
;W[co]C[Remember this good empty triangle? Let's take it out of the cookie jar to eat it. Yum!]
;B[cn]
;W[bm]C[Ouchie.])
(;B[el]C[Black should probably jump.]
;W[bm]C[But black still has a weak point!])))
(;B[br]C[Usually black plays here immediately, as a probing move. This is good timing.]
(;W[cq]C[White often reponds solidly.])
(;W[aq]LB[hq:A]C[This is an option. But when black has a stone at A, this is normally risky. ]
;B[dr]LB[cq:A][fr:B]C[There is this aji here. Making miai of A and B.])))
(;W[co]
;B[nm]C[Somewhat of a keypoint!]))
(;B[nm]
;W[jr]C[This sliding move is very big. And black wants to defend against it.]))
(;W[co]C[If white plays tenuki..]
;B[qh]C[This move threatens to set up the ko again.]
;W[oi]C[When white defends black is connected underneath and white has no points on the right side, because black can still invade.]))
(;W[gc]C[White wants to play here, but can not fight the ko]
;B[pi]
;W[rh]
;B[ep]
;W[eq]
;B[qh]C[It is difficult to find a good threat for white now]
;W[pg]C[Connecting is also bad]
;B[oi]SQ[qi][oj][qj]C[Black already gained. The marked stones are hurt. And white still needs to fight the ko.]))
(;B[qi]LB[pc:A]C[Connecting looks normal, but black has bad aji at A still]
;W[rf]
;B[sh]
;W[sf]
;B[pc]
;W[pi]
;B[rj]
;W[qk]
;B[rk]
;W[rl]
;B[sg]C[White gets sente and black corner in the upper right is not so big.]))
(;B[rf]
;W[qg]
;B[qi]
;W[ri]
;B[rg]
;W[og]
;B[ng]
;W[ph]
;B[pi]
;W[oi]
;B[pg]
;W[pj]LB[rf:A]C[Black is captured.
Thus A is a bad choice.])
(;B[ri]
(;W[rf]LB[pc:B][qi:A]C[A and B are miai])
(;W[rg]C[also works]
;B[qi]
;W[pc]C[Not possible for black, white captures the corner.])))
(;B[pi]LB[rh:A]C[Amateurs will often play this move to prevent the connection at A.]
;W[rh]
;B[rg]
;W[qg]C[White can't cut anymore]
;B[ri]
;W[qi]
;B[ph]))
(;W[ch]C[Also possible]))
(;W[ff]C[This is never played, but can be considered when white wants to build the upper side and already has stones in the upper right corner]
;B[df]
;W[fd]
;B[ck]SQ[nc]C[This is a bad choice for white, especially also because the marked stone negates whites influence.]))
(;W[rh]LB[ri:A]C[This is possible, later on black can continue with A]
;B[ri]
;W[qi]
;B[rg]
;W[ph]
;B[qg]
;W[pg]
;B[pf]
;W[rf]
;B[sh]
;W[qd]
;B[pe]
;W[qc]
;B[qk]C[This is a very complicated variation.]
(;W[rj]LB[qo:A]C[This leads to a big fight but is possible when white has supporting stones around A]
;B[pi]C[Black will start the fight])
(;W[oj]C[Also possible, more quiet.]
;B[rj])))
(;W[rd]
(;B[qh]
;W[qc]
;B[qe]
;W[re]
;B[pf]
;W[pg]
;B[qg]
;W[rf]
;B[og]
;W[jp]
;B[pj]C[Popular opening.])
(;B[qg]
;W[pg]
;B[qh]
;W[pf]
;B[qc]
;W[pi]
;B[qj]
;W[qi]
;B[ri]
;W[ph]
;B[pj]
;W[rh]
;B[rg]
;W[sh]
;B[rk]
;W[rf]C[This is also common..])))
(;W[ci]C[The Chinese and micro Chinese is a popular response.]
;B[nc]C[This type of game is where both players try to develop their own influences.])
(;W[qj]
(;B[qf]
;W[qo]
(;B[po]
;W[qn]
;B[rp]
;W[pn]
;B[oo]
;W[ci]C[Common])
(;B[qm]
;W[pp]
;B[pq]
;W[qn]
;B[rp]
;W[pm]C[Also common.]))
(;B[qh]
;W[qm]
;B[pl]
;W[ql]
;B[pj]
;W[pk]
;B[ok]
;W[qk]
;B[pi]
;W[ol]
;B[nk]
;W[om]
;B[pn]
;W[pm]
;B[jc]C[Possible.])))