(;GM[1]FF[4]SZ[19]AP[SmartGo:3.1.4]CA[shift_jis]
GN[Redmond-ChoU2018]
PW[Cho U]WR[Meijin]
PB[Michael Redmond]BR[9P]
EV[Tengen Elimination A section]
DT[2018-11-8]
KM[6.5]
RE[W+R]MU[0];B[pd];W[dp];B[qp];W[dd];B[fq]
C[This opening that was so popular for Black is getting bad scores with the computer programs, and seems to be fading out. That said, there were some variations I wanted to try out, and I had been playing this with some success in 2018. ]
;W[nc]LB[oq:A]
C[White 6 is a relatively new move that is not just a kakari, but it functions as a ladder breaking move for the LL corner. The Japanese program Zen always played at A with White, as still do most Japanese pros, so that was the move that I had done most preparation for. ]
;B[cf];W[oq];B[cn];W[dn];B[dm];W[en];B[cp];W[cm];B[co];W[dl]
C[This is the ladder that White A was making possible. ]LB[nc:A];B[dq];W[em]
C[The joseki variation in the lower left has been around for a long time, but used to be an unusual choice for White. With computer analysis, this has become the mainline when the ladder favors White. After the game Cho U told me that the 'AI' analysis gives White a slight advantage, but he would not tell me the score. White has some aji for a cut at A.]
LB[cq:A];B[fc];W[df];B[dg];W[ef];B[cd];W[cc];B[ce];W[dc]
(;B[ci]
C[Among the accessable programs, Zen is still my favorite, maybe because it is relatively similar to humans in the way it plays. When I input this position, I was suprised to see that Zen wanted Black to extend on the upper side, while the game move at 27 was only third choice (see var). ]
;W[ic]
(;B[qf]
C[In this position it is urgent to continue on the upper side, and my choice to take territory and bide my time was a mistake (see var). ]
;W[po];B[qo];W[pn];B[qn];W[pm];B[pb]
C[Black 35 was another lost opportunity. I had to play at A. ]LB[hd:A];W[qm]
;B[qr];W[dh];B[cg];W[eg];B[ei];W[eh];B[bj];W[ie]
C[White 44 was an important point that gave White a favorable position. ]
;B[fi];W[jp];B[kn]
C[Black 47 hopes to reduce White's potential in the center and lower side, and happens to support the ladder when White pushes through at A. ]
LB[di:A];W[in]
C[White 48 also happens to break the ladder for the push at A, but this is not a serious threat. White's main object is to attack Black on the lower side. ]
LB[di:A];B[kp];W[kq]
(;B[jo]
C[Covering on the third line is not good (see var). ];W[lp];B[io];W[ko];B[hn]
;W[ln];B[im];W[hq]LB[di:A][ck:B][ek:C]
C[The local fight to 57 was about even, with Black giving White some territory but getting a position facing the center.  However, in a game that was already difficult for Black, it simplified the position too much. I overestimated my potential for attack against White's group on the left, which can make eyes with the push at A and peeps at B and C. ]
;B[gf]
C[Black 59 is the correct shape here, in combination with Black's next move. Diving in more deeply would have been too dangerous. ]
;W[gd];B[jc];W[jd];B[kc];W[ib];B[kd]LB[gf:A][jc:B]
C[Though I say it myself, The combination of A and B is a tactical combination that is worthy of note. Black has reduced the White territory and created some potential for Black on the right. ]
;W[ke];B[le];W[ld]LB[fd:A]
C[White has bad aji at A, so White goes after three Black stone to solve that problem. ]
;B[kf];W[je];B[md];W[lc];B[mc];W[lb];B[mb];W[kb];B[mf]LB[gf:A]
C[The fight starting with Black A was a local success for Black. White started with an advantage, and chose to simplify the game while taking a small local loss. White's next move is the final big side move, a fact that helps to compensate. ]
;W[pi];B[ri];W[km];B[or]
C[Black 81 is a very large move when compared to White playing at A. ]LB[pr:A]
;W[pq];B[pr];W[qq];B[rq];W[rr];B[rs];W[hl]
C[White is not going for a kill here, but is attacking to control the game as we enter the endgame. ]
;B[il];W[hk];B[ik];W[hj];B[ek];W[ij];B[kk];W[jj];B[kl];W[jn];B[hm];W[fl]
;B[gp];W[li];B[hp];W[gr];B[iq];W[ir];B[gq];W[hr];B[bc];W[bb];B[bd];W[og]
;B[qh];W[lg];B[lf];W[oe];B[nd];W[cq]
(;B[do]
C[I allow White to live in the corner. While the game is lost anyway, this is better than taking the corner on a small scale (see var). ]
;W[dr];B[ep];W[br];B[er];W[bp];B[ds];W[cr];B[bo];W[aq];B[nq];W[np];B[ab]
;W[cb];B[ao];W[ap];B[gh];W[hg];B[gg];W[nr];B[ns];W[mq];B[fd];W[fe];B[ge]
;W[ee];B[ml];W[ck];B[cj];W[bm];B[qj];W[ni];B[mj];W[lj];B[mk];W[ok];B[ol]
;W[pk];B[fn];W[rm];B[so];W[ip];B[bk];W[ho];B[fk];W[gm];B[gn];W[el];B[bl]
;W[kg];B[ms];W[jf];B[nf];W[of];B[hd];W[gc];B[hc];W[gb];B[hb];W[ha];B[he]
;W[ne];B[me];W[od];B[oc];W[hh];B[rk];W[lr];B[nn];W[pp];B[sr];W[ph];B[mh]
;W[mg];B[mi];W[ng];B[nb];W[qg];B[rg];W[pg];B[qi];W[rn];B[ro];W[qe];B[pe]
;W[rf];B[pf];W[sg];B[rh];W[qd];B[pc];W[rc];B[rb];W[sj];B[rl];W[se]
C[White gets a ko inside Black's territory. I resigned. ])
(;B[dr];W[ep];B[fr];W[bn];B[bo];W[bl];B[bq];W[gh]
C[In this var Black's corner territory gets reduced significantly.]))
(;B[lq];W[lp];B[ko];W[jq];B[mp];W[lo];B[mn];W[mq];B[ln];W[lr]
C[This is not very exciting for Black with most of White's territory intact and all his stones connected. ]
))
(;B[hd];W[id];B[hf];W[ie];B[he];W[eg];B[dh]LB[eg:A][dh:B][eb:C]
C[Black should immediately continue on the upper side, inducing the A-B exchange to give Black good shape on the left. While the Black group on top is weak, Black has some potential counterplay with Black C. Zen gives White a score of 51 (or Black 49), which is the same as White's score at the start of a game, so I would call this even. ]
))
(;B[ic];W[hd];B[hc];W[bh];B[ch];W[bg];B[cg];W[ci];B[di];W[cj];B[fh];W[fd]
LB[ic:A][jd:B]
C[Zen wanted to play an extension at A or B, while I immediately discarded this var with White taking away Black's base on the left and chasing the weak Black group into the center. White has a small advantage, with Zen giving a score of 51. ]
))

