(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]SZ[19]KM[6.50]GN[Lee-Sedol-vs-Choi-Cheolhan-20131215]PW[Choi Cheolhan]PB[Lee Sedol]WR[9d]BR[9d]DT[2013-12-15]EV[41st Myeongin]RO[Game 5]SO[http://gogameguru.com/]AN[An Younggil 8p]C[This is the 5th and last game of the 41st Myeongin (Korean Meijin) final, played between Lee Sedol 9p and Choi Cheolhan 9p.

Lee won the first game of the final, but Choi won next two games to lead the series 2-1. Lee fought back with a win in game 4, and this was the deciding game of the 41st Myeongin title match.

The head to head record between these two players is 31-19 in Lee's favor. Up until this game, there had been four finals matches between these two, and Lee had won them all.

The winner's prize in the Myeongin is 80 million Won (about $75,000 USD at the time of writing) and the runner up receives 25 million Won (about $23,000).

The final is played as a best of five match and the time limit for the games is 2 hours and 3 x 1 minute byo-yomi for each player.]RE[W+Resign];B[pd]C[Lee Sedol plays black.];W[dd];B[qp](;W[eq]C[Choi played to avoid black's Mini Chinese Opening.](;B[cq]LB[cp:A]C[Approaching at A is more common, but Lee chose to play here in the game. This approach is more concerned with the corner territory.](;W[cn]LB[co:B][do:C][dp:A][ep:D]C[This pincer can be a trick play. There're several options for black now (A-D).](;B[dp]C[Lee chose this diagonal move, which was good.](;W[en];B[ep];W[fp](;B[fo]C[This hane was good.];W[gp];B[eo](;W[kq]C[This extension was right. ];B[oq]TR[cn][en]C[White's marked stones on the left side are light, so black just enclosed the corner here.](;W[nc];B[qf](;W[cg]C[This enclosure was a multi-purpose move. It indirectly helps white's stones on the left and at the top, and reinforces the corner too. ];B[oc];W[nd];B[jd]C[Pincering here was natural, since white didn't play there.](;W[hc]C[This was a good response. Since black pincered white in the top right, white pincers black too. This move follows the Go proverb "if you have to run, then bring a friend." Both weak groups can run out together now.];B[ld];W[nf]C[The game's still well balanced. ](;B[oe];W[ne];B[kg]LB[qc:3][ne:B][oe:A][pe:1][qe:2]C[Black secured the corner with the exchange of A for B. If black doesn't make this exchange, he has to worry about white 1, black 2 and white 3, which is annoying.];W[of];B[pf];W[oi];B[qi];W[li]C[Black got some points on the right side, but white's center stones become more solid in compensation.](;B[jh]C[This diagonal move looks slow, but it was a proper move. ];W[jj];B[hh](;W[he]C[This jump was still nice.];B[pk];W[ig](;B[if]C[This was a nice attachment.](;W[hg];B[ih](;W[hf]LB[if:A][hg:B]TR[ig]C[Since black already exchanged A for B, white needs to reinforce here now, because white's stones became heavier.](;B[mh];W[mi];B[ij](;W[ik];B[jk](;W[nh]LB[ke:A][kf:B]C[Choi wanted to make himself safe and strong, in order to fight properly in the upcoming battle. This move also continues to aim indirectly at the cut around A or B.](;B[kj]LB[id:A]C[Playing atari here showed fighting spirit, but black should have peeped at A first.];W[kf]TR[jd][ld]C[Choi tried to cut black's marked stones off. ](;B[id]C[Black wanted white to answer to this peep...](;W[jl];B[ji];W[jf]C[This move was also motivated by fighting spirit. Neither player wanted to follow their opponent's plan.];B[hd](;W[gc]C[This extension was severe. ];B[gd]TR[gd][hd][id]SQ[gc][hc][he]C[Even though black drilled straight through white's shape, which would usually be considered bad for white, it's ok in this case because white's attack is very powerful.];W[fc]LB[jj:A]C[Since black captured white's center stone at A, white should attack this group severely, to get some compensation.];B[ff];W[fg];B[eg](;W[gh]C[This was the right answer for white.];B[fd];W[ed];B[fh];W[gg];B[ee]LB[cf:C][df:B][ef:A]C[I think connecting at A would have been slightly better for black, because it prevents white's peep at B and prepares a continuation at C. However, it seems like Lee Sedol was satisfied with the shape in the game.];W[df];B[ef];W[fi]C[The flow of the game was good for white at this point. White's positions are solidifying naturally in the process of fighting.];B[de];W[ce];B[cd];W[cc];B[bd];W[bc];B[ch]C[This attachment was sente. ](;W[be]C[Answering here was necessary.];B[ej]LB[ch:A]C[This diagonal jump was very good in combination with A.];W[ei];B[di](;W[dj]C[This cut was a mistake.](;B[eh]C[Connecting here was good, and ](;W[gj]C[Reinforcing here was necessary. ];B[cj];W[dk];B[ck];W[dl];B[kl]C[Black was lucky to be able to come back here. At this point the game became well balanced again.];W[il];B[go];W[hp];B[er];W[fr];B[dq];W[fq];B[gl];W[fk];B[hi];W[gi];B[in]LB[kl:A]C[Black was able to play many forcing moves after A, and the game's not bad for black.];W[kc](;B[jb];W[kb];B[hb]C[Black resisted at the top, but it was very risky.];W[bi]C[White struck at black's vital point.];B[bh];W[bl];B[bj];W[lk](;B[kd]LB[kk:A]C[Black didn't answer at A, but reinforced his big group. Lee might have thought that answering at A was too risky now.];W[kk]TR[kg][hh][ih][jh][mh][hi][ji][ij][kj][jk]C[Anyway, white's happy enough to cut here. Black's center group is practically captured.];B[ll];W[mk];B[jq]C[The game's hopeless for black at this point, but Lee Sedol's magic time has just started...];W[jr]LB[jj:B][hk:A]C[White needs to answer carefully, because black can play A to make a ko in the center at B.];B[kp];W[lq];B[hk];W[hl]C[This was the right response, to get more liberties. ];B[cl];W[cm];B[gk](;W[gm]C[Playing the hane here was the right move for white.];B[fl];W[fm];B[el];W[dm];B[hm]C[The ko fight's begun.];W[jj];B[ir];W[jp];B[jk];W[jm];B[km];W[jj];B[ec];W[dc];B[jk];W[jn];B[jo](;W[kn]C[This move was inevitable. ];B[ip];W[lp]TR[kg][hh][ih][jh][hi][ji][ij][kj][gk][hk][jk][el][fl][gl][fp][gp][hp][eq][fq][fr]C[Even though black was able to capture white's marked stones at the bottom, white's already captured the center, and the game's still favorable for white.];B[ko];W[ln];B[lo];W[mo];B[mn]C[Actually, the game had become very complicated now, and it was good news for black.];W[hn];B[lm];W[jj]C[White shouldn't answer any ko threats here.];B[ek](;W[im];B[hj];W[lg]LB[ig:A]C[This answer was necessary, to save the group at A.];B[ho];W[io]C[Another big ko started.];B[em];W[fn];B[in];W[fj]LB[ij:A]C[White captured black's center group again.](;B[no];W[mp];B[nm]C[Lee tried incredibly hard to catch up.];W[io]C[This ko has become very important. ];B[jg];W[ie];B[in];W[hr];B[io]C[Black ended the ko here, but it's not the end.];W[is](;B[hq]C[Lee created another ko fight here.];W[iq];B[jk];W[hm];B[ir];W[np];B[op];W[iq];B[dn];W[do];B[ir];W[mm];B[nn];W[iq];B[co];W[dn];B[ir](;W[nl]C[This was a very big move, and white can now aim to break in to black's right side later.](;B[iq]C[Black won the ko again, but it's still not the end. ];W[lr]C[White can still do something here. ];B[nr];W[gs]C[This was a very good move which created yet another ko...](;B[gq]C[This was the right move for black. ];W[dr];B[es];W[ds];B[gr];W[fs];B[hs]C[It's ko again.];W[oo]LB[nl:A]C[Fortunately, white has some ko threats here, because of his move at A.];B[om];W[hr];B[ks];W[br];B[cr];W[cs];B[bq];W[js]LB[bo:C][br:A][cs:B]C[The ko became more important after white exchanged moves at A and B. If white wins the ko, white can capture the big black group with C.];B[hs];W[ol];B[pm];W[hr];B[ls](;W[mr];B[hs];W[ge];B[fe];W[hr](;B[ms]C[This was the right move for black.];W[nq];B[hs]C[It looks as if white doesn't have any ko threats left...](;W[or]C[This cut looked like a good idea, but it was a big mistake.];B[kr];W[ns]C[Choi might have thought that this was good enough to win, but];B[pr]C[Lee was still desperate, and didn't want white to live here. ](;W[qr];B[pq];W[ps](;B[rq];W[rr];B[sr]C[This move was what Choi didn't think carefully about, ];W[qq];B[pp];W[rp];B[sp]LB[il:A][io:B][iq:C][hs:D]C[So Lee resisted with another big ko. There were already really huge ko fights from A to D, and another one had just started.];W[sq];B[lf]LB[hs:A]C[This ko threat works now because this ko fight is smaller than the earlier ko fight at A.];W[le];B[rq];W[js];B[jr];W[sq];B[mf];W[mg];B[rq];W[ro]C[This was the right move for white, and];B[rs]C[It was still a ko.];W[sq];B[je];W[me];B[rq];W[ai];B[gf];W[if];B[qs]LB[ai:A]C[Black didn't respond to A, and removed the ko instead.](;W[mb]C[This reinforcement was necessary. ];B[ic];W[eb];B[gb];W[fb];B[ke];W[lf];B[ga]C[Black made an eye, and ](;W[ci]C[It's another ko. ](;B[ah]C[This atari shows the right move order to start the ko.];W[dh];B[dg](;W[pl];B[qm];W[ql];B[rm];W[qc]C[White invaded here, to create a more powerful ko threat.];B[qd];W[ob];B[di];W[rc];B[aj]LB[ob:A][rc:B][io:C]C[While white got some compensation in the top right corner with A and B, black eliminated the ko on the left side. The game's become very close now, because black won most of the ko fights from C onwards.];W[ri]C[This was a nice tesuji. ](;B[rj]C[Playing the hane here was the only answer for black.];W[qh](;B[ph]C[This was a very nice tesuji to save the group.](;W[qj];B[pi];W[rk];B[rh];W[sj];B[sh]LB[ph:A]C[Black successfully saved the group with A.](;W[re];B[rd];W[sd](;B[pj]C[There were no options, except to save the single stone here.];W[rf];B[rg];W[od];B[qk];W[rl];B[rj]C[So another big ko started. This was an extremely tough game for Lee.];W[bo](;B[pc]C[This move was a mistake.];W[pb](;B[bp]C[Coming back here now was a crucial mistake.];W[qj];B[qb]TR[oc][pc][pd][qd][rd][oe][pf][qf][rg][ph][rh][sh][pi][qi][pj][pk][qk]C[Only ko threats in this area are available now, because the marked stones aren't alive yet.];W[rb];B[rj];W[ap];B[aq];W[qj];B[sc];W[sb];B[rj];W[sm];B[sn];W[qj];B[qe];W[se];B[rj];W[bs];B[ar];W[qj];B[sf];W[sc];B[rj];W[sl];B[rn];W[qj](;B[ra]C[There were no other options for this move.];W[qa];B[rj]C[It looks as if there are no more sufficiently big ko threats for white, but];W[ja]C[This hane was a brilliant ko threat!](;B[si]C[Ending the ko was inevitable, and];W[ia]C[This is sente, and ];B[ib];W[cf]C[Connecting here was sente again. Black lost 2 points here, and the game was reversed again.];B[bg];W[bf];B[bi]C[It's very painful to have to live like this.];W[an]C[This was the last big endgame move, and the game was decided.];B[lc];W[lb];B[og];W[oj];B[ok];W[nk];B[oh];W[al];B[ng];W[ni];B[fa];W[ea];B[af];W[ad];B[cp];W[ao];B[bm];W[am];B[sg];W[sk];B[pe];W[bn];B[ag];W[ka];B[gn];W[ml]LB[ja:D][pc:C][dh:A][aj:B]C[White won by resignation.

Actually, there was an incident after this last move. White was winning by 1.5 points. However, the game was very tiring for both players and Lee forgot to connect at A while they were filling the neutral points (dame). White captured all the stones at the top, so Lee resigned. 

Choi Cheolhan became the new Myeongin! There have been only seven Myeongins in Korea in 41 years: Cho Namcheol 9p, Kim In 9p, Seo Bongsu 9p, Cho Hunhyun 9p, Lee Changho 9p, Lee Sedol 9p, Park Younghun 9p and now Choi Cheolhan 9p.

White was leading in the middle game, but Lee tried to catch up with a chain of ko fights. The game became more and more complicated with so many trades, and eventually Lee reversed the game, after winning the ko fight at B, but C was a mistake, and Choi ultimately reversed the game again with a nice ko threat at D.

I hope you'll feel Lee's fighting spirit in the way he resisted with so many ko fights, and you may also feel the ultimate excitement of Go throughout the whole game.

Choi Cheolhan lost the Chunwon (Korean Tengen) against Park Younghun 9p in the final in January 2013, but he regained his position as a title holder before the end of the year.

In an interview after the game, he said, "I really wanted to win this Myeongin title as a present for my wife (Yun Jihee 3p), who's pregnant."

On the other hand, Lee lost all his final matches in 2013. He was in five different finals (the Maxim Cup, GS Caltex Cup, Chunlan Cup, Samsung Cup, and the Myeongin), but he couldn't add to his list of titles. It's not a good sign for him, but I hope that he'll be able to come back in 2014, and that the jubango against Gu Li 9p will be very exciting.
])(;B[ia]C[If black responds here,];W[qj]C[There are no ko threats left for black.];B[pa];W[rj];B[qb];W[sg]C[This is a double ko, so black can't win.]))(;B[qa]C[Black can think about this, and](;W[pa]C[If white answers here, ];B[rj]LB[ra:A][qb:B]C[Black still has two more ko threats at A and B, and black would win.])(;W[rj]C[If white doesn't answer, ];B[ra];W[sg];B[oa]LB[nb:A]C[This is a good ko threat! (A is also possible)];W[na];B[sf]C[There's no ko threat for white after that.])(;W[si]C[However, white can play here, and];B[ra];W[sg]C[Capturing here is sente, and there's no ko threat for black. ];B[qg];W[pa]C[So black will die.])))(;B[si]C[Black should have finished the ko here. ];W[bp]C[This is sente, but ];B[ap]C[Black's still a tiny bit ahead, maybe by half a point.]))(;B[bp]C[Black should have answered here right away. ];W[qj];B[pc]C[Now black can connect here as a ko threat, and he would still win the game.]))(;B[rf]C[If black just answers here, ];W[pj]C[White would win the game with this move]))(;W[pj]C[This is a big endgame move, and];B[rd]C[This is also big. ];W[sd];B[se];W[sc];B[og]C[The game is very close. ]))(;W[pi]C[If white cuts here,];B[qj];W[rh];B[qg]TR[qh][rh][ri]C[White can't save the marked stones. ]))(;B[rh]C[If black cuts here, ];W[rg](;B[si];W[qg]TR[oc][pd][qd][oe][pf][qf]C[The marked stones will be captured.])(;B[ph];W[qg];B[pg];W[sh];B[pi];W[re];B[rf];W[sf];B[rd];W[sd];B[rk]C[Black can connect like this, but white's destroyed all of black's territory here, and white's winning now.])))(;B[rh]C[If black falls back,];W[rj];B[qj];W[rk]TR[oc][pd][qd][oe][pf][qf][rh][qi][qj]C[Black can't live. ](;B[re];W[rg](;B[sh];W[qg];B[pg];W[qh];B[ph];W[sg]C[Black's dead.])(;B[qh];W[sh]C[Black's dead.]))(;B[ph];W[re];B[rd];W[sd];B[rf];W[se]C[Black's dead.])))(;W[di]C[If white connects here, ];B[cf]C[Black can live. ];W[bg];B[bf]LB[ae:A][ag:B]C[A and B are miai for black. ])(;W[cf]C[If white connects here to start the ko, ];B[di]C[There's no big ko threats for white, so ]))(;B[dg]C[If black ataris here, ];W[cf];B[ah];W[dh]LB[dg:A]C[Black's just lost a ko threat at A, and there are no ko threats anymore.]))(;W[aj]C[White can't just kill black like this...];B[ak];W[bk];B[ci];W[al];B[ah]LB[ak:A][bm:B]TR[ai][bi][aj]C[White doesn't have time to connect at both A and B, so black will live after capturing the marked stones.])(;W[ah]C[This move doesn't work either...];B[bg];W[ag];B[bf];W[af]C[White can save his stones, but];B[cf]LB[ae:A][ci:B]C[Black lives easily like this and A and B are miai now.]))(;W[eb]C[If white plays something like this instead,];B[mb](;W[nb];B[mc]TR[kb][kc]C[Black can capture the marked stones and live.])(;W[mc]C[Cutting doesn't work for white either,];B[lc];W[lb];B[nb]C[Black simply connects here and his big dragon in the top left is safe.])))(;B[qq]C[If black plays here,];W[rr]C[White's alive, and the game's over.]))(;W[pq]C[If white cuts here, which is often a good move in these sorts of situations,];B[pp];W[qq];B[qr];W[rq];B[rr]C[Black can resist like this, and];W[rp];B[qo];W[ro];B[qn];W[rn];B[rm];W[sr];B[ps];W[rs];B[sn];W[so];B[sq];W[sm];B[rl]TR[sm][rn][mo][ro][so][lp][mp][np][rp][kq][lq][nq][pq][qq][rq][lr][mr][or][sr][ns][rs]C[White can't capture black's four stones in the corner, so white's marked stones are all dead.]))(;W[dg]C[White should have played here, which was white's last ko threat.];B[dh];W[hr];B[ns]C[This is also black's last big ko threat, but];W[or];B[hs];W[pp]C[White can atari here, and ](;B[pq];W[hr]C[There's no big ko threat for black now. The game would have been decided here.])(;B[kr]TR[fp][gp][hp][eq][fq][br][dr][fr][cs][ds][fs][gs]C[If black trades, capturing the marked stones...];W[pq]C[It's even worse for black, because black's lower right corner has been destroyed. The still game's over.])))(;B[nq]C[If black plays here, to stop white from making an eye here,];W[ms];B[hs];W[dg]C[White has the last big ko threat here.];B[dh];W[hr];B[lf]C[This is the biggest ko threat for black now, but];W[hs];B[ke];W[bo]TR[ge][he][ie][hf][jf][kf][fg][gg][hg][ig][gh][ei][fi][gi][fj][gj][fk]SQ[in][co][eo][fo][go][ho][io][jo][ko][lo][dp][ep][ip][kp][bq][cq][dq][gq][hq][iq][jq][cr][gr][ir]C[It's a really big trade, but white's still winning.]))(;W[hs]C[If white connects here, ];B[mr]LB[dq:B][eq:A]C[Black will win the capturing race between the groups at A and B.]))(;B[ds]C[If black plays here, ];W[gq];B[fs];W[es]LB[br:B][dr:A]TR[in][eo][fo][go][ho][io][jo][ko][lo][dp][ep][ip][kp][cq][dq][hq][iq][jq][ir]C[It's a ko, but if white wins this ko with A, white can attack the marked group with B afterwards.]))(;B[gr]C[If black ataris here,];W[gs]LB[nl:B][oo:D][iq:A][lr:C]C[White will answer here to continue the ko at A. In this case, white's move at B is better placed than it would be at C, and white has some more ko threats starting with D.]))(;W[lr]C[If white still plays here, ];B[gr];W[iq];B[fs]TR[fp][gp][hp][eq][fq][fr]C[Black can capture the marked stones in sente, so white shouldn't play like this.])(;W[gr]C[If white connects here, ];B[kr]C[Black can cut here, and it's still a ko. ]))(;B[iq]C[If black connects here, ];W[lr];B[hq];W[gr]LB[dr:B][nr:A]C[White's winning, because A and B are miai to live.]))(;B[io]C[If black just ends the ko here,];W[no]LB[mn:A]C[Black can't save the stone at A, and white is still winning.]))(;W[hj]C[If white cuts here, ];B[jk]CR[he][hf][jf][kf][fg][gg][hg][ig][gh][ei][fi][gi][gj][hj]TR[ik][hl][il][jl][jm][jn][kn][ln]SQ[dj][dk][bl][dl][cm][dm][fm][gm][cn][en]C[There isn't a big enough ko threat on the board after black recaptures the ko. White's marked groups are all in trouble and white can't save all of them.]))(;W[iq]C[If white answers here, ];B[kn];W[jj];B[ek]C[This is a good ko threat.];W[io];B[hj];W[hn]TR[dj][dk][bl][dl][cm][dm][fm][gm][cn][en]C[This atari is necessary, to save the marked stones, but];B[lf]TR[he][hf][jf][kf][fg][gg][hg][ig][gh][ei][fi][gi][gj][fk]C[White's marked stones will get captured instead.]))(;W[hj]C[If white cuts here, ];B[fl];W[el];B[hm]LB[jj:A]TR[fl][gl][hm][in][fo][go]C[Black will play like this. White needs to fight the ko at A, but the ko is lighter for black than it was in the actual game. In addition, the marked stones work well together, to strengthen black's lower left group (you can compare it to the position in the game).]))(;B[kk]C[If black answers here, ];W[ah];B[ag];W[ai];B[ec];W[dc];B[eb];W[fb];B[ic];W[ea];B[bg];W[ga]C[If white wants to kill black's group he'll play here.];B[mb](;W[nb]C[Answering here is the safe way of playing.];B[lb];W[lc];B[jc];W[la](;B[ma]C[This atari is necessary. ];W[mc];B[gb];W[db];B[ia]C[Black can live, and ];W[na];B[ja];W[qm]C[White gets sente to invade here. The game's still even.])(;B[gb];W[db];B[ia];W[fa];B[ha]LB[ma:A][mc:B]C[If black plays here without exchanging of A for B,];W[ja]C[White can make a ko here later.]))(;W[mc]C[If white tries to kill this huge group,];B[nb](;W[lb];B[ke](;W[lc];B[lf];W[lg];B[mg];W[lh];B[mf];W[nk]LB[kk:B][lk:A]C[As you can see, the exchange of A for B is beneficial for white, but it's still very complicated.])(;W[lf]C[If white extends here, ];B[ja]LB[ha:A][lc:B]C[Black will extend here. A and B are miai to live.]))(;W[lc]C[If white connects here, ];B[ja]LB[ha:B][ka:A]C[Black can live. A and B are miai next.]))))(;B[cl];W[cm];B[bi]C[Black should have saved his group like this.]))(;W[ci]C[If white ataris here, ];B[gi];W[dh];B[lf]TR[he][hf][jf][kf][fg][gg][hg][ig][gh]C[White's center stones will be captured like this.]))(;B[cj]C[If black carelessly ataris here, ];W[dh];B[dk];W[eh]TR[fd][gd][hd][id][jd][ld][de][ee][ef][ff][eg]C[Black's marked stones will be captured.]))(;W[eh]C[White should have taken this stone.];B[dg](;W[bg];B[dh]C[Black can connect here, but ];W[dj]C[White can still cut now.];B[cj];W[dk];B[ck];W[dl];B[bh]C[Black needs to play one more move here, and];W[kl]C[Now white has time to extend here, which is an excellent point for either player. The game's good for white.])(;W[dh]C[If white cuts here, ];B[cf];W[bg];B[bf]LB[ae:A][bh:B]C[A and B are miai, and white's in trouble.])))(;W[cj]LB[be:A]C[If white doesn't answer at A,];B[be]LB[ce:A]C[Black will atari here, and white can't save the stone at A.]))(;W[fe]C[If white tries to cut here, ];B[fd]C[Black will answer here, and it's hard for white to continue. ]))(;W[gd]C[If white blocks here, ];B[gc];W[fc];B[gb];W[fd];B[hb]C[It's too easy for black to settle at the top.]))(;W[hd]C[If white answers here, ];B[lf](;W[ke];B[le]LB[jf:A][mg:B]C[Now, black can connect his stones. A and B are miai next.])(;W[jf]C[If white plays here, ];B[mf]C[Black can connect like this.])))(;B[lf]C[If black answers here, ];W[ke];B[le];W[lg]LB[nh:A]TR[ke][kf]C[White can cut black in two like this. Black can't capture white's marked stones, and it's troublesome for black. Observe the role white's reinforcement at A plays in helping white to cut, in contrast to the variations at move 46.]))(;B[id]LB[hd:A][kj:B]C[Now was the right time for black to play here. A and B are miai next.]))(;W[hj]C[If white ataris here, ];B[kj];W[ii];B[ji]TR[nc][nd][ne][nf][of][li][mi][oi]C[Black will play like this. White's marked stones have become weaker. ])(;W[kj]C[If white extends here, ];B[hj];W[il];B[gl]C[Black will play like this. ]))(;W[ke]C[If white peeps here now, ];B[le](;W[lf];B[kf];W[je];B[mf]LB[lf:A]TR[mh][mi]C[Black can capture the stone at A. ])(;W[kf];B[lf];W[lg]C[If white cuts here, ];B[lh];W[mg];B[nh]C[Black will play like this, and it's not a good shape for white. ];W[lb];B[kd];W[ie];B[kb];W[mb];B[ib];W[ob];B[pb]LB[ld:A][nd:B]C[It's a capturing race between the groups at A and B. It's very hard for white to win the race without a ko fight, so white shouldn't play like this.])))(;B[ij]LB[mh:A]C[If black doesn't play at A, ];W[ke]C[White can peep here, and ];B[le];W[lf];B[kf];W[je]TR[jd][ld][le]C[Cut black off like this.]))(;W[hj]C[If white still jumps at A,];B[hf]LB[gf:A][gg:B]C[Black will push here, making miai of A and B. It's no good for white.]))(;W[hf]C[If white answers here, ];B[hg]LB[ig:A]C[Black can cut here to capture the stone at A.];W[jf];B[ie];W[jg]C[If white tries to escape, ];B[kf];W[je];B[id];W[ke];B[le]C[White's stones will be captured.]))(;B[ih]C[If black just connects here, ];W[hj]C[White will jump here. ];B[if]LB[hf:C][hg:B][ig:A]C[If black attaches here now, white can treat A lightly. Extending to B now would be heavy and black C would be difficult to answer afterwards.];W[ie];B[jf]LB[kc:C][lf:B][ig:A]C[The stone at A has served it's purpose, and black's overall shape feels slow and heavy. Later on, white might peep with moves like B or C.]))(;W[ec]C[This is also possible, but the move in the actual game was more active.]))(;B[ji]C[If black plays knight's move here, ];W[he]LB[jh:A]C[White will jump here, and black needs one more move to prevent white from cutting at A. ])(;B[he]C[This is also conceivable, but];W[ec]C[White will be happy to answer here.]))(;B[kg]C[If black just jumps here,];W[pe];B[qe];W[qc](;B[qd];W[ob]C[It's annoying for black when white bullies him like this.])(;B[pc];W[qd]C[A complicated fight will start after this and black wanted to avoid it.])))(;W[ld]C[If white plays from this side,];B[fc]C[Black will be happy to approach here.]))(;W[jd]C[This move is more common, then];B[ci]C[Black will split here. ];W[ck];B[cf];W[ce];B[df];W[fd];B[ei];W[ek]LB[cc:A][hc:B][lc:C]C[Once black's left side group becomes stable, there're many weaknesses at the top (at A to C for example), so white didn't choose this variation.]))(;W[dj]C[Extending here is also possible, but];B[fc];W[df];B[jd]C[Choi didn't want black to develop the upper side like this.]))(;W[oq]C[If white approaches here, ];B[iq]LB[en:C][gp:A][oq:B]C[Black will pincer here, and white will become very busy managing his weak stones.]))(;B[fq]C[If black cuts here, ];W[gq];B[fr];W[gp];B[gr];W[hr];B[er]LB[eq:A]C[Black can capture the stone at A, but];W[op]C[White has sente, and can approach here. Lee didn't seem to like this variation. ]))(;W[ep]C[If white pushes here, ];B[do]C[Black will extend here. White can't seal black in.]))(;B[co]C[Attaching here is also conceivable.];W[dn];B[ep]C[This attachment is a nice haengma. ](;W[fq]C[Extending here is the right response for white. ];B[fp];W[gp];B[dq];W[hq];B[gr];W[gq];B[bo]LB[op:A][oq:B]C[This is another game. White will approach at A or B next. ])(;W[dp]C[This hane doesn't work well in this game.];B[dq];W[fp];B[eo];W[do];B[fq];W[er];B[fr]LB[pd:B][fo:A]C[The ladder starting with A doesn't favor white, because of the stone at B.]))(;B[do]C[This knight's move isn't good now.];W[dn](;B[co];W[eo];B[en];W[fo]C[The position is already better for white. ];B[em];W[cl];B[dl];W[bo];B[bp];W[dp];B[cp];W[bm];B[ao];W[bn];B[br];W[dr];B[aq]C[Even if black can live in the corner, ];W[cj]C[The result up to here is good for white. ])(;B[eo]C[If black extends here, ];W[co]TR[do][eo][cp][cq]SQ[co][eq]C[White strikes at the vital point, and it's painful for black.];B[dq];W[er];B[ep];W[hq]C[Black's still unsettled, and it's good for white.]))(;B[ep]C[This attachment isn't good either. ];W[dp];B[dq];W[er](;B[do]LB[dp:A]C[If black tries to capture the stone at A,];W[cp];B[co];W[bp];B[bo];W[bq]TR[cq][dq]C[White can capture the marked stones. It's good for white.])(;B[bo]C[This is the right move, but ];W[cp];B[bp];W[en];B[fp];W[bq];B[br];W[cr];B[aq];W[dr];B[bq];W[hq]TR[ep][fp]C[It's still better for white. It's hard for black to move the marked stones out.])))(;W[do]C[If white plays here which is the most common continuation,];B[co];W[dn];B[cn];W[dm];B[cm];W[dl];B[oq]C[Black will play like this. Black has two certain corners, and the game looks easy for black.]))(;B[oq]C[If black plays here, ];W[cp]C[White can also enclose the corner. ]))(;W[dp]C[If white plays here, which is fine,];B[fq];W[cn];B[kq]LB[kq:A][lq:B]C[Black may continue like this (or with A at B, which is similar). This is called the Mini Chinese Opening. It's playable for both and is quite popular, but Choi might have felt like trying something different.]))