(;CA[utf-8]ST[2]RU[Japanese]GM[1]C[Kim Jiseok is a top Korean player. In this game Master starts with a big shimari that I have come to recognize as it's usual style, but then shocks me with an early invasion to the 3-3 point. ]
AP[CGoban:3]SZ[19]FF[4]DT[2016-12-31-13- 9-13]PB[Master]PW[Kim Jiseok]WR[9p]
KM[6.5]RE[B+]MULTIGOGM[1]
;B[pd];W[dd];B[qp];W[dp];B[np]C[In many of it's games Master has played this shimari or the Ogeima shimari from the 3-4 point. In the weeks after Master's appearance, this opening has become widely popular among pros. I have added vars to show some of the most common moves for White.]
(;W[qf]TR[qj]C[Kim played the kakari, which is maybe not as popular as the wariuchi (marked), but is still a fairly common move. ]
;B[ph]C[Kim played a joseki that I do not like (see var). ]
(;W[of]C[The game move. ];B[nd];W[rd];B[qc];W[rh];B[og]C[Black creates potential for a ko (see var). ]
(;W[nf]C[Usually Black plays low (see var). ]
(;B[kd]TR[og]C[Playing 13 (marked) once and then extending on the upper side is the most modern form of this joseki. Black threatens a ko next (see var). ]
(;W[pe]TR[nf]SQ[og][ph]C[White protects at 16, erasing the potential ko. The 13-14 exchange (marked) has become bad for Black, but meanwhile Black has gained sente. I think this is good for Black. ]
(;B[cf];W[fc]C[A kakari to the LL corner is what looks like a normal move (see var). ]
(;B[cq]TR[cf][fc]C[This move is still hard to believe, as I would surely choose a kakari to the LL corner instead. This is not the only game in which Master played an early 3-3 invasion. My first hypothesis is that it might be playing this when the value of both sides (left and lower in this case) are equal. I also wonder if Master already thinks that it has a lead and is trying to simplify the position. Having the marked exchange played first works well for Black, as we shall see in a few moves. ]
;W[dq];B[cp];W[co];B[bo];W[cn];B[bn];W[cm]TR[ce]C[ Having played the 17-18 exchange first allows Black to settle on the left side easily. If Black had played 17 after the moves in the LL corner, White would attack with the diagonal attachment (marked). Black does not finish the LL joseki for a good reason (see var). ]
(;B[cd]C[The game move. ];W[cc];B[bc];W[ce];B[bd];W[de];B[be];W[cb];B[df]
(;W[ic];B[gd];W[gc];B[bm];W[cl]TR[bm]LB[dr:A]C[By crawling once at 39 (marked) Black avoids playing the hanetsugi at A. ]
;B[dc];W[db];B[cj]C[Just how thick is White's wall, and how should White play on the lower side? (See var). ]
(;W[jp]C[This extension turned out to be too wide. ];B[hp]
(;W[lq];B[eo];W[do];B[hn]C[Since White's wall on the left has no eye shape yet, it is not good when Black moves out into the center like this. White has made a basic mistake in the use of this wall. ]
;W[nr];B[lp];W[kp];B[lo];W[oq];B[po];W[qj];B[iq];W[jq];B[em]C[Black 59 strengthens the Black group and makes White's wall an eyeless group. ]
;W[el];B[fl];W[ek];B[fk];W[ej];B[fj];W[ei];B[ch];W[fi];B[pr]C[Black has chased White's eyeless group, taking territory on all sides. Black's early invasion to the 3-3 point has been a success in this game. ]
;W[qm];B[jn];W[ir];B[hr];W[kr];B[pl];W[ql];B[pj];W[qi];B[jc];W[md];B[mc];W[od];B[oc]
;W[ne];B[oe];W[cr];B[br];W[od];B[is];W[jr];B[oe];W[pi];B[gi]C[Chasing White's weak group again, Black finally starts to surround the center. Black already has enough territory on the sides, and the upcoming profit in the center will be the difference. End of commentary. ]
;W[gq];B[gp];W[en];B[fm];W[gh];B[hi];W[od];B[nc];W[mj];B[ib];W[fg];B[hc];W[fe];B[nl]
;W[oj];B[lk];W[lj];B[kj];W[ki];B[jj];W[qd];B[pc];W[on];B[mk];W[oo];B[op];W[pq];B[qq]
;W[pp];B[mr];W[qo];B[or];W[nq];B[mq];W[ns];B[fq];W[ms];B[ls];W[pn];B[lr];W[rr];B[mn])
(;W[in];B[eo];W[do];B[hn];W[hm];B[gn];W[im];B[fl]C[White cannot successfully attack Black. ]))
(;W[ip];B[kq];W[ko]C[White 1 is the correct extension. White is weak in territory, and probably felt that this would not be good enough. However,  since some of Black's territories are thin, this is still a difficult game. ]))
(;W[ip];B[hc]C[Black 2 is a big move, putting some pressure on the White corner group. ]))
(;B[dr];W[er];B[cr];W[fq]LB[lq:A][iq:B]C[Master did not play this joseki sequence. In this case when the lower side is still wide open, I agree that it is better not to play this, as White's extra thickness with 4 gives White control of the side when White next plays at A. So why is this called a joseki? Usually Black invades the corner when White has already played an extension to the side, say at B. In such a case, the White stone at B and White's thickness would create an overconcentrated shape, and it would be good for Black to play the hanetsugi.   ])
(;B[bd]C[Master never plays this move. ]))
(;B[fq];W[cn]
(;B[bd]C[Master never plays this keima on the second line. ];W[cc];B[ci]C[A common joseki ( for human players). ])
(;B[dj];W[dr];B[jq]C[This looks like a normal sequence. ])))
(;B[ri]
(;W[qi];B[qh];W[rj];B[rg];W[si];B[rf];W[qg];B[re];W[qe];B[qd]C[An example of the fight that might start when White counters strongly with 2. ])
(;W[qh];B[qi];W[pi];B[qk];W[oh];B[pj];W[oi];B[oj]C[An example of how Black might play later to surround the right side. ])))
(;W[fq];B[qg];W[rg];B[pf];W[pe];B[qe];W[pg];B[ep]
(;W[qh];B[eq]C[Black needs only one valid ko threat to make this ko work. The trade to 10 is good for Black. ])
(;W[eq];B[pf];W[pq];B[rf]C[Good for Black.])))
(;B[kc]C[This makes a solid territory on the upper side. ]))
(;W[pg]C[If White plays to avoid the ko, Black will be able to close off the center. ]
;B[qh];W[rg];B[nf]
(;W[ng];B[oh];W[ne];B[mf];W[oe];B[me];W[od];B[oc];W[nc];B[md];W[ob];B[pc];W[mc]
;B[qe]C[Good for Black. ])
(;W[oh];B[ng];W[oi];B[fc];W[cf];B[qj]C[Good for Black. ])))
(;W[qc];B[qd];W[pc];B[od];W[rd];B[re];W[rc];B[qe];W[nc];B[fq];W[cn];B[fo];W[qj]
;B[ql];W[rf];B[pf];W[qh];B[pi];W[qi];B[ok];W[se];B[dm];W[dn];B[em];W[bl];B[im]TR[pp]
[mq]C[I suggest that simply jumping in at 1 is better for White. White has room to later invade at 13. A similar opening was played by Takemiya 9P and Yamashiro 9P on March 30th, with the difference being that the two Black stones in the LR corner were at the marked points. With White, Yamashiro won that game by 1/2 point. ]))
(;W[fq]C[This shimari was played against Master twice in the 60 games, by Gu Zihao and Ke Jie. ]
(;B[fc];W[cf];B[jd];W[qj]C[Master did not actually play this fuseki, but I have the feeling that it would give Black's kakari in the upper left a high score. ])
(;B[gp]
(;W[fp];B[gn];W[qi];B[qk];W[qf];B[qe];W[pf];B[nd];W[oj];B[oh]C[Master launched a strong attack in this game against Gu Zihao. I will give a more detailed commentary on this game in a separate video.])
(;W[gq];B[pj];W[nc];B[pf];W[qc];B[pc];W[pb];B[ip];W[rb];B[hq]C[In this game against Ke Jie Master created a huge moyo.])))
(;W[qj]))
