(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]
PW[Iyama Yuta]PB[Chen Yaoye]WR[9d]BR[9d]DT[2013-11-11]EV[18th LG Cup quarterfinal]C[This is the quarter finals of the 2013 18th LG Cup.
Iyama Yuta is the the rising star of Japan, he is number one in Japan but he is still looking for his first international win.
At this point all Korean players have been eliminated and so if Iyama Yuta is unable to win, the semi-finals will be only made of Chinese players.
Chen Yaoye has always been a young star of China. He is looking for his second World Champion title after beating Lee Sedol in the Chunlan Cup earlier this year.
]RE[B+Resign]
;B[qd]
;W[dc]
;B[pq]
;W[cp]
(;B[nc]LB[ce:A][po:B][eq:C]C[This has not been a popular opening lately. Normally black plays A.
The four 3-4s positions played by both players shows their confidence in creating a complicated fighting game.
Iyama Yuta is also known a fighting style player, contrary to most Japanese players.
White has a few options, C, B are all viable.]
(;W[eq]LB[de:B][qo:A]C[Black can choose to protect another corner at A or approach B.]
(;B[de]LB[ce:A]C[A is possible for white now.]
(;W[po]C[It seems white is very confident and not playing where expected.]
;B[qm]LB[on:B][qq:A]C[Chen attacks first, B is possible, but A is preferred in this case usually.]
(;W[qq]LB[mq:A]C[At this point A is a very popular choice.]
(;B[qr]
;W[qp]
;B[mq]LB[om:A]C[Many possible choices, A is one of them]
(;W[pm]C[White thinks this will give white a better result.]
;B[pl]
;W[or]
;B[pr]
;W[oq]
;B[op]
;W[pp]
;B[nq]
;W[om]
;B[qn]LB[ql:B][np:A]
;W[np]
;B[oo]
;W[no]
;B[on]
;W[pn]
;B[nn]
;W[ql]
;B[qk]
;W[rl]
(;B[pk]
;W[rk]
;B[rj]
;W[rn]LB[mn:A][rr:B]C[This is a joseki.
Later on white has aji at A and B]
;B[mn]
;W[ce]LB[dd:A][cf:B]C[At this point black will probably focus on the top side instead and play A instead of B.
We can see here that joseki choice can be changed according to the surrounding situation.
]
(;B[dd]
;W[cd]
;B[ec]
;W[cf]
(;B[db]LB[df:A]C[Black is playing simple and believes he is satisfied with this result.
A is also possible if black wants to play the avalanche.]
;W[cc]
;B[fd]LB[jd:B][ci:A]C[Since black didn't extend at B, white will invade for sure at B.
Moves like A are too passive.]
(;W[jd]
;B[gq]LB[jd:A]C[Black is being very patient.
Chen is known to be a territorial player, so he is not looking to attack immediately, but instead just grabbing big moves.
In additon the stone at A is very difficult to attack at this point.
In situations where you don't konw how to attack or play, you can just play big moves and tenuki.]
(;W[gp]LB[dj:A]C[At first look,  I feel this might end up as a helping move for black.
I wouldn't recommend such moves for beginners because it simply gives away free territory, which we like to avoid.
A is a possible choice here for white.]
;B[hp]
;W[go]
;B[fq]
;W[ep]
;B[hd]LB[jf:B][dj:A]C[Black has several aims with this move.
1. Settle his own group
2. Preparing to invade the left side.
3. Attack white.

White can tenuki with A or save jump out with B.]
(;W[jf]
;B[dj]C[Black is isn't in a hurry to attack either.]
;W[ch]
;B[qi]
(;W[fj]LB[cl:A][go:3][ep:5][gp:1][hp:2][fq:4]C[Very aggressive.
Since black gained alot of territory on the bottom,
white needs to use his exchanges to gain some profit at least. 
A would be way too passive.]
;B[dl]
;W[fl]
;B[ci]
;W[dh]
(;B[bh]C[Black is just looking to settle.
If black lives here without losing too much blood then black will be ahead in terms of territory.]
(;W[bj]LB[bg:A]C[Very aggressive. 
A would be very passive and black would be able to settle quite easily.]
;B[bi]
;W[bl]
;B[ei]C[Escaping is the only choice here.]
;W[fg]
;B[fi]
;W[gc]LB[hc:A]SQ[ge][he][gf][hf]C[probing move.
If black responds with A then white will have sente around the marked spots that will help attack black.]
;B[cb]
;W[df]
;B[gd]
;W[fb]
;B[eb]
;W[ic]C[White is fairly aggressive here, black needs to find a way to settle two groups now,]
;B[gh]
;W[gg]
;B[bc]
;W[bd]
;B[ac]C[Black  is alive locally.]
(;W[ne]C[Again, white isn't attacking the left side because there isn;t a great move, so he is simply tenuking.]
;B[ho]
;W[hn]
;B[in]C[Black is just grabbing territory. Basically saying, if you can't kill my group, I will be ahead.]
;W[im]
;B[gn]
;W[hm]
;B[co]LB[do:A]C[tesuji.
A does not work for white.]
(;W[cn]
;B[fp]
;W[fo]
;B[eo]
;W[fn]
;B[do]
;W[hq]
;B[en]
;W[fm]
;B[bp]
;W[fr]C[Big exchange here, but it seems black gained alot more in terms of territory.]
;B[cq]
;W[pc]LB[di:A]TR[gh][ei][fi]C[Black has no more weak groups and is ahead in terms of territory, black is definitely in a good lead at this point. 
Though white can cut black's stones with A later on]
;B[pd]
;W[oc]
;B[od]
;W[nd]
;B[nb]
;W[qc]
;B[rc]
;W[rb]
;B[rd]
;W[ob]
;B[lc]
;W[na]
;B[ma]
;W[mb]
;B[mc]
;W[la]
;B[lb]
;W[le]C[Ko here, but it seems black isn't cared of the ko.]
;B[ma]
;W[bn]
;B[cl]
;W[mb]
;B[rm]
;W[sm]
;B[ma]
;W[em]
;B[dm]
;W[mb]
;B[sk]
;W[qo]
;B[ma]
;W[di]
;B[cj]
;W[mb]
;B[ke]
;W[kd]
;B[ma]C[white is lacking good ko threats.]
;W[bb]
;B[ba]
;W[mb]
;B[me]
;W[mf]
;B[ma]
;W[ad]
;B[ab]
;W[mb]
;B[lf]
;W[ld]
;B[ma]
;W[nr]
;B[mr]
;W[mb]
;B[sb]C[a big reason why black isn't scared of the ko is because black has alot of self ko threats.]
;W[kb]
;B[ma]
;W[dq]
;B[dp]
;W[mb]
;B[dr]
;W[gr]
;B[ma]
;W[dn]C[This is not a good ko threat.]
;B[ka]
;W[bo]
;B[cp]
;W[ap]
;B[br]
;W[ar]
;B[ao]
;W[an]
;B[bm]
;W[cm]
;B[bk]
;W[am]
;B[ak]
;W[al]
;B[aq]
;W[bq]
;B[cr]
;W[er]C[Clearly this ko is good for black.]
;B[aq]
;W[aj]
;B[ai]
;W[bq]
;B[as]
;W[bs]
;B[aq]
;W[qb]
;B[ao]
;W[pa]
;B[jb]
;W[md]
;B[pg]C[Because there is a ko in the corner, black does not need to play there right away.]
;W[kc]
;B[ra]
;W[sc]
;B[sd]C[Again, there is a ko here.]
(;W[ej]
;B[bm]C[Black captured this group, and therefore the top right group is also automatically captured.]
;W[ib]
;B[sc]
(;W[lm]
;B[ie]
;W[if]
;B[lj]
;W[jc]
;B[sa]C[Therefore white resigned at this stage becaues he lacks too much territory.])
(;W[jc]
;B[sa]
;W[ja]
;B[qa]
;W[la]
;B[oa]C[white is captured.
]))
(;W[ib]
;B[sc]
;W[jc]
;B[sa]
;W[ja]
;B[qa]
;W[la]LB[ej:A]C[Though black is captured because white has unlimited ko threats in the bottom left corner, white would still lose in terms of territory if black can connect at A.]
(;B[oa]C[This is an interesting situation like this, tWhite can use th]
;W[ap])
(;B[ej]
;W[mb]
;B[rr]C[Black would win nonetheless.])))
(;W[do]
;B[dn]
(;W[cn]
;B[eo]C[Fell into blacks trap.])
(;W[en]
;B[cn]C[White is captured.])))
(;W[ba]
;B[bb]
;W[aa]
;B[ea]
;W[ca]
;B[gb]C[Black can live with this tesuji.]))
(;W[bg]
;B[cn]LB[bg:2][bh:1][ck:A]C[A no longer works here for white because of the 1-2 exchange.]
;W[ck]
;B[dk]
;W[bi]
;B[bj]C[Does not work for white.]))
(;B[cn]LB[ck:A]C[If black just plays this white can play A]
;W[ck]
;B[dk]
;W[bi]C[painful for black.]))
(;W[cl]
;B[dl]C[Very easy for black to settle.]))
(;W[dj]LB[jd:A]C[This would be very greedy, but it is indeed possible because stone A is fairly light and hard to attack.]))
(;W[dj]
;B[hd]
;W[jf]
;B[go]C[Normal]))
(;W[ci]
;B[mf]C[Black would be ahead.]))
(;B[df]
;W[dg]
;B[cc]
;W[db]
;B[bc]
;W[cb]
;B[cg]
;W[ch]
;B[bb]
;W[eb]
;B[bg]
;W[bf]
;B[bh]
;W[bd]C[This will lead to very complicated situations.]))
(;B[cf]
;W[cd]
;B[dg]
;W[fc]
;B[ck]
;W[cm]
;B[ek]C[Though this is joeski, clearly playing on the top side is bigger than playing on the left side for black.]))
(;B[rk]
;W[pk]
;B[ol]
;W[nl]
;B[ok]
;W[mn]))
(;W[om]
;B[pm]
;W[ol]
;B[pk]
;W[or]
;B[pr]
;W[oq]
(;B[pp]
;W[op]
;B[qo]
;W[ro]
;B[oo]
(;W[pn]
;B[qn]
;W[on]
;B[rr]
;W[no]
(;B[pj]C[Joseki, but Black is slightly more satified as black has a better formation than white,])
(;B[fd]C[Playing tenuki here is a big mistake.]
;W[pl]
;B[ql]
;W[qk]
(;B[qj]
;W[rk]
;B[rj]
;W[rl]
;B[rp]
;W[rn]
;B[rq]
;W[qp]
;B[qq]
;W[rm]
;B[qp]
;W[pj]
;B[ok]
;W[pi]LB[ri:A][nk:B][ss:C]C[A and B are miai. On top of that black still needs to play at C to make life in the corner.])
(;B[rk]C[Also painful.]
;W[qj]
;B[rj]
;W[qi])))
(;W[qn]C[Not good]
;B[pn]
;W[qo]
;B[rq]))
(;B[op]LB[de:A]C[Black can even play here, as A is a good ladder breaker]
;W[pp]
;B[nq]
;W[np]C[This ladder is good for black]
;B[oo])))
(;B[mq]
(;W[pp]
;B[pr]
(;W[qn]
;B[pm]
;W[qr]
;B[jq]C[Joseki])
(;W[ro]
(;B[qr]
;W[qk]
;B[rq]
;W[pl]C[Also joseki.])
(;B[qj]
;W[qr]
;B[jq]C[Joseki])))
(;W[mp]
;B[lp]
;W[nq]
;B[np]
;W[mo]
;B[nr]
;W[lq]
;B[oq]
;W[mr]
;B[nq]
;W[kp]C[Though this is possible locally, in this situation it doesnt work because the ladder does not work globally.])
(;W[pr]C[Be careful not to play here.]
;B[qp]
;W[pp]
;B[oq]
;W[rp]
;B[qr]
;W[qo]
;B[rr])))
(;W[on]
;B[mq]
;W[pl]
;B[qp]
;W[ql]C[old joseki but usually favoured for black.]))
(;W[ce]
;B[cf]
;W[cd]
(;B[df]
;W[fc]
;B[cj]
;W[po]C[Possible ])
(;B[bp]
;W[bo]
;B[co]
;W[do]
;B[cn]
;W[bn]
;B[cm]
;W[bm]
;B[cl]
(;W[cq]
;B[df]
;W[fc]
;B[cj]C[Possible.])
(;W[cj]
;B[ck]
;W[cq]
;B[dj]
;W[df]
;B[cg]
;W[ef]C[Also possible.]))))
(;B[qo]
;W[ce]C[Possibly will lead to a long game.]))
(;W[po]
;B[qo]
;W[qn]
;B[qp]
;W[pm]
;B[nq]
;W[qi]
;B[qg]
;W[oi]C[normal]))
(;B[ce]
;W[oc]C[This us a recently popular opening and often lead to very complicated games.]))
