(;GM[1]FF[4]SZ[19]AP[SmartGo:3.0.1]CA[utf-8]
GN[RR15_master36_Gu_Zihao_01_final]
PW[Gu Zihao]WR[9p]
PB[Master]BR[9p]
DT[2017-01-02]
PC[The KGS Go Server at http://www.gokgs.com/]
KM[6.5]
RE[B+Resign]
RU[Japanese]ST[2]
TM[60.0]TT[30]
C[Commentary by Michael Redmond 9P
Gu Zihao was born in 1998, and won the Limin Cup (youth) Intl tournament in 2015. He is moving up in the rankings, and now is in the top 30 players in the world. Master plays it's distinctive style in all parts of the board, with the most shocking move being an early invasion to the 3-3 point. ]
MU[1];B[pd];W[pp];B[dc]
C[Master's game plan will change depending on how White plays in the LL corner (see var). ]
(;W[dp];B[df]LB[cn:A]
C[Master usually chooses this shimari when White has a star point in the LL corner. I think that Master plans to approach at A next, and judges that the big shimari at 5 will work well with that (see var). ]
(;W[cn]TR[dr]
C[When the opponent plays low, Master plays high, so...];B[dm]TR[cn]
C[...the shoulder hit seems to be Master's default reaction to White 6 (marked). ]
;W[dn];B[fm]
C[Where to play on the upper side? (see var)]
(;W[kc]
C[It is correct for White to play away from Black's strong position on the left side. ]
;B[ic];W[nc];B[oc];W[nd]
C[In modern Go, Black usually plays on the third line now (see var). ]
(;B[pf]
C[Black plays high to emphasize the potential to attack White's group. Black 5, 9, and 15 are all moves that will work well with an attack on the upper side, so White should try to play solidly here (see var). ]
(;W[je]
C[After White protects the group with 16, most pros would start to surround territory on the upper and right sides (see var). ]
(;B[le]
C[To attack so strongly when White has just protected at 16 is counterintuitive. However, Black 17 hits a vital point in White's shape, and it is difficult for White to refute. ]
;W[hd];B[lc]
C[Black continues to fight strongly, cutting off White's two stones on the right. ]
;W[lb];B[kd];W[jc];B[jd];W[id];B[mb];W[kb];B[nb];W[hc]
C[This seems to be an even trade locally. Black has gained territory in the UR corner area, and White has erased Black's potential on the upper side, with some White territory. It is important that Black has sente. Master places a high value in keeping sente and thus controlling the game. ]
(;B[qq]TR[pf][fm]
C[Black 29 was a shocking move, even though Master had already played an early 3-3 invasion in the game against Kim Jiseok (dated 2016-12-31). Why would Master invade when both sides are wide open? How can Master play this nonconventional move and go ahead to take the lead? I was taught not to do this, so what can I say? Maybe Master calculates a high potential to win and is trying to simplify the game. Maybe Master knows that the marked stones will help to reduce the effect of any White thickness. It will take me time to digest this move, and meanwhile I can only guess. ]
(;W[pq]
C[In the game White covered on this side.];B[qp];W[qn];B[rn];W[qm];B[qo]
;W[po];B[rm];W[ql];B[iq]
C[Strangely, White's wall doesn't seem to have enough room to be used as thickness. ]
;W[kq];B[kp]TR[fm]
C[With the marked stone, Black can play this attachment (see var). ]
(;W[lp];B[jp];W[lq];B[dr]
C[This already looks good for Black. I must admit that Black 29 worked out fairly well for Black, and that I would never have dreamed of playing there before seeing this game.  ]
;W[gq];B[fr]
C[Black threatens to connect to the right or cut White (see vars). ]
(;W[eq]
(;B[fq];W[fp];B[gp];W[go];B[hp];W[er];B[fo];W[ep];B[gr];W[es];B[cm]TR[gq]
C[The trade starting with White 46 (marked) was an interesting sequence, but it was bad for White. The corner has some bad aji. ]
;W[ch];B[bf];W[eh];B[lg]TR[nc:nd]
C[Black 63 is a big move, capturing the marked stones and reducing White's potential in the center. ]
;W[fn]
C[By capturing one stone and moving out into the center, White tries to get rid of the bad aji in the corner, and maybe he is even hoping to attack Black on the side. ]
;B[bn];W[bo];B[co]TR[fo][dr]
C[With perfect timing, Black 67 makes use of the two marked stones(see var).  ]
(;W[en];B[bp];W[bm];B[ao];W[bl];B[ck];W[cl];B[cr];W[dl]TR[ck][cm:dm][fm]
C[In this trade Black has gained about 20 pts in the corner while discarding the marked stones that were about to be a problem for Black. White's side territory can be reduced from the center, and Black has secured a lead. ]
;B[fc];W[ng];B[ne];W[pg];B[qg];W[ph];B[kn];W[qf];B[qe];W[rf];B[rg];W[me]
;B[mc];W[of];B[pe];W[rh];B[hm];W[gn];B[hk];W[gm];B[lo]
C[Black's light play from 93 to 97 is worth savoring. White's potential in the center has dissappeared. End of commentary. ]
;W[jm]TR[hr];B[kl];W[ds];B[br];W[jl];B[jk];W[km];B[lm];W[ll];B[kk];W[mm]
;B[ln];W[in];B[jn];W[im];B[io];W[hl];B[bh];W[lk];B[ki];W[dd];B[cd];W[cc]
;B[ed];W[lj];B[ih];W[kj];B[jj];W[kh];B[li];W[lh];B[mi];W[kg];B[gh];W[hg]
;B[gj];W[hh];B[hi];W[gg];B[gl];W[fk];B[il];W[hn];B[fh];W[fg];B[fj];W[ij]
;B[ik];W[fi];B[fl];W[em];B[ek];W[ej];B[dk];W[bg];B[cg];W[ci];B[gi];W[dg]
;B[ag];W[jh];B[ei];W[ji];B[ml];W[mk];B[nl];W[nk];B[ok];W[nm];B[ol];W[nj]
;B[rl];W[qk];B[re];W[qh];B[sf];W[pr];B[rk];W[qj];B[qr];W[db];B[de];W[eb]
;B[cb];W[bc];B[bb];W[fb];B[on];W[om];B[nn];W[pm];B[np];W[nq];B[ps];W[ec]
;B[dd];W[os];B[qs];W[nr];B[ii];W[ba];B[bd];W[ca];B[ac];W[oe];B[od];W[nf]
;B[lf];W[ig];B[kf];W[jg];B[cp])
(;W[do];B[bm]
C[2 vars for White's move]
(;W[cp];B[gm]TR[bm]
C[Playing 2 (marked) with sente was a big profit for Black. ])
(;W[gm];B[cp];W[bp];B[cq];W[bq];B[br];W[cr];B[cs];W[dq];B[cr];W[ar];B[as]
C[The corner becomes a ko. ]))
(;W[bm];B[en];W[do];B[gn]LB[fn:A]
C[Capturing in the center after White has played at A is a success for Black. ]
))
(;B[er];W[gn]LB[gr:A]
C[If Black connects on the 2nd line, White can make shape while threatening to cover at A. ]
))
(;W[gr];B[fq]
C[This fight is bad for White. ])
(;W[dl]
C[Maybe White should have switched to the left side like this. ]))
(;W[jp];B[jq];W[ko];B[lp];W[lq];B[mq];W[mr];B[mp]TR[fm]
C[With the marked stone, this fight looks difficult for White. ]))
(;W[qp];B[pq];W[oq];B[or];W[nq];B[nr];W[mq];B[mr];W[lq];B[qj]TR[fm]LB[rp:A]
C[Black 10 on the right side is the perfect extension to reduce the use of White's wall. Master does not play the hanetsugi at A in a position when it can extend on the side at 10. ]
))
(;B[qn];W[nq];B[pk]
C[I would play this way with Black. ]))
(;B[ie];W[if];B[he];W[jf];B[nb];W[mb];B[qi]
C[Assuming the sequence to 7, this actually looks good for Black, so I would be tempted to play this way. ]
))
(;W[id];B[hd];W[jd];B[hc];W[if]TR[df][pf][dm][fm]
C[Locally, White is losing points by giving Black good shape on the upper side. Overall, Black's high moves (marked) will notwork very well when White creates a strong group on the upper side, so I like this var for White. ]
))
(;B[qf];W[je];B[ie];W[if];B[he];W[jf];B[nb];W[mb];B[qn]LB[qc:A]
C[After surrounding territory on the upper side, Black exchanges 7 for 8 to reduce the danger of White A, and then can play away at 9. This is not bad for Black, but it was refreshing to see Master come up with something completely different. ]
))
(;W[jc];B[lc];W[gc];B[hd];W[hc];B[jd]
C[Black can attack immediately. As White makes life, Black will be able to consolidate the UL and UR areas, and control the center. ]
))
(;W[jc];B[cn];W[fq]
C[Now I expect Master will play a klarge-scale move to make best use of the large shimari in the UL (see var). ]
(;B[en];W[cj];B[ej]
C[This var works well for Black. The big shimari enables Black to attack effectively on the left side. ]
)
(;B[bp];W[cq];B[ck]TR[df]
C[Master would not play this way. The big shimari (marked) is weak in territory and is not ideally placed when Black plays for territory like this. ]
)
(;B[gp]
C[Maybe Master will play this katatsuki. ])))
(;W[cp];B[cf];W[jc];B[eq]
C[When White plays the 3-4 pt in the LL, Master plays the ogeima shimari in the UL, and plays the low kakari. I am calling this Master's 'favorite' Fuseki. ]
))

