(;GM[1]FF[4]SZ[19]AP[SmartGo:0.6.7.1]CA[utf-8]
GN[RR23_2017.07.11_Redmond_Matsumoto]
PW[Michael Redmond]WR[9P]
PB[Matsumoto Takeshi]BR[7P]
EV[Oza B Section]RO[Final]
DT[2017-07-06]
KM[6.5]
RE[B+1.5]
RU[AGA (Area)]CH[1]
C[Oza B Section
White:  Michael Redmond 9P
Black:  Matsumoto Takeshi 7P
Commentary:  Michael Redmond 9P

This game is the final round of the Oza B section, and my opponent is Matsumoto Takeshi 7P.  I had a good position in the middle game, but failed to fully make use of some aji in Black's right side territory and fell behind in the final stages of the game.]
;B[pd];W[dd];B[qp];W[dp];B[np];W[fq];B[qg];W[fc];B[dj];W[cl];B[gd];W[fd]
;B[gf]
C[Black is trying to play the style of the Master version of AlphaGo in this opening.]
;W[lq];B[gp]
(;W[lo]
C[I do not want to answer too much on the lower side.  See the variation.]
;B[mq];W[qo]
C[This move is meant as a kikashi, before White plays a hane on the second line.  See the variation to Black's next move.]
(;B[po];W[pn];B[qn];W[ro];B[rn];W[pm];B[ql];W[ok];B[oo];W[nn];B[lr];W[kq]
;B[kr];W[iq];B[ko]
C[A vital point in White's shape.]
(;W[rp]
C[See the variation.];B[qq];W[mr]
C[A tesuji to fix White's shape.]
(;B[ln]
C[See the variation, where Black answers White's previous move.];W[nr];B[lp]
;W[jq]
C[White gains more than 20 points on the lower side.  Black gains potential to attack in the center, making this result an even trade.]
;B[pl]
C[Black tries to give White heavy shape.]
(;W[mk]
C[See the variation.];B[ol];W[nl];B[nj];W[mj];B[ni];W[mi];B[nh];W[nk];B[lg]
;W[qk]
C[A tesuji to make good shape.];B[pk];W[pj];B[om];W[on];B[rl];W[nm]
(;B[oj]
C[Black should protect the lower side instead.  See the variation.];W[mo]
;B[mp];W[kp];B[jo];W[rq];B[rr];W[pr];B[qr];W[jk]
C[By cutting with the marked play (move 59), Black gains territory on the right side.  But some bad aji remains.  Now White is attacking in the center.]
TR[oj];B[gq];W[fr];B[el];W[gl];B[cp]
C[With this attachment Black will either scoop out the corner or create some forcing moves to fix his shape in the center.]
;W[do];B[co]
(;W[cq]
C[Here in the game I choose to take profit on the side.  See the variation.]
;B[dn];W[cn];B[en];W[bn];B[jm]
C[Black threatens to cut.]
(;W[fo]
C[See the variations.];B[gm];W[hm];B[gn];W[im];B[fp];W[ho];B[ip];W[io];B[jr]
;W[ir];B[hr];W[js];B[dq];W[eq];B[ep];W[dr];B[eo];W[dq];B[jp];W[ls];B[hp]
;W[gj]
C[In the sequence from the marked play (move 82), I reinforce White's group in the center and prevent Black from making eyes.]
TR[fo];B[ck]
C[The fight settles down, and now is time to think of how to reduce the right side.

I have an opportunity now, but miss a simple effective move.]
(;W[pc]LB[qj:A][qf:B]
C[While looking at the aji in the lower right corner, I simply did not think of connecting at A or attaching at B.  My failure to make full use of this aji on the right side is the main cause of my defeat in this game.  See the variations.]
;B[qc];W[qd];B[pe];W[qb];B[rc];W[oc];B[rb];W[lc];B[nd];W[nc];B[bd]
C[White lost an opportunity with the marked play (move 106), but the game is still close.]
TR[pc]
(;W[hd];B[cf];W[ge];B[hf]
(;W[od]
C[Instead see the variation -- I still have a chance to make some use of the aji on the right.]
;B[oe];W[md];B[ne]
C[Black is now strong in the center, and the game is difficult for White.]
;W[df];B[dg];W[ce];B[be];W[cg];B[bf];W[ef];B[dh]
C[The game is still close.]
(;W[bk]
C[See the variation.];B[bl]
C[A tesuji.];W[bm];B[bj];W[al];B[jl];W[ik];B[fl]
C[Now White's center becomes weak, and the game is looking good for Black.]
;W[jh];B[kd];W[jc];B[gk];W[hk];B[hl];W[il];B[hi];W[ii];B[kc];W[kb];B[jb]
C[A tesuji.]
(;W[lb]
C[An overplay.  But the game is turning bad for White in any case.];B[ic]
;W[jd];B[id];W[je]
(;B[gc]
C[A mistake.  See the variation.];W[hc];B[ie];W[ib];B[jf];W[ke];B[cc];W[kf]
;B[gi];W[fk];B[gl];W[hj];B[fi];W[dk];B[cj];W[fj];B[ek];W[fg];B[hh];W[aj]
(;B[ff]
C[See the variation.];W[eg];B[ei];W[bi];B[hb];W[gb];B[ia];W[db];B[dc];W[eb]
;B[cb];W[jg];B[fe];W[he];B[if];W[ee];B[ec];W[ed];B[da];W[cd]
(;B[pb]
C[See the variation.];W[ob];B[qa];W[bg];B[ci];W[bh];B[af]
(;W[mf]
C[Black's group in the center is alive, as the variation shows.];B[mh];W[lh]
;B[lf];W[me];B[kh];W[kg];B[li];W[ki];B[lh];W[kl];B[km];W[kk]
(;B[go]
C[Black's group in the center must add a move here to live.];W[og]TR[mf]
C[When I jumped in with the marked play (move 206), I was trying to set up this move.  White has lost some points in the center, but this move reduces Black's right side to get a larger profit.]
(;B[pi];W[qf];B[qe];W[qj]
(;B[qi]
C[Black must answer here on the right side.  See the variation.];W[sn];B[sm]
;W[nf];B[pf];W[qm];B[rm];W[sp];B[so];W[bc];B[bb];W[sn];B[rj];W[pp];B[op]
;W[pq];B[so];W[lj];B[sq];W[dl];B[ej];W[dm];B[gs]TR[mf]
C[White has gained a couple of points in the sequence from the marked play (move 206).]
(;W[mm]
C[I missed the best move here, but was losing by half a point anyway.  See the variation.]
;B[lm];W[ll];B[oh];W[pg];B[ph];W[ca];B[ba];W[oa];B[ag];W[ai];B[fs];W[es]
;B[le];W[ld];B[ps];W[os];B[qs];W[pa];B[qb];W[em];B[fm];W[fa];B[jn];W[ka]
;B[ca];W[ks];B[gr];W[ea];B[gc];W[gd];B[ga];W[ha];B[oq];W[or];B[ga];W[fb]
;B[ha]
C[Black wins by 1.5 points.])
(;W[ph];B[qh];W[ca];B[ba];W[mm];B[lm];W[ll];B[fs];W[es];B[ag];W[ai];B[le]
;W[ld];B[ps];W[os];B[qs];W[oa];B[ea];W[fb];B[pa];W[em];B[fm];W[jn];B[pg]
;W[oh];B[oi];W[ka];B[ac];W[ak];B[ca];W[in];B[kn];W[or];B[qo];W[ks];B[gr]
;W[ja];B[ib]
C[Black wins by half a point.]))
(;B[qm];W[qh]
C[Now White can break into the side with this clamp.]
(;B[ph];W[pg];B[rg];W[rf];B[rh];W[re];B[rd];W[pf];B[nf];W[ng];B[mg];W[qi]
LB[nf:A]
C[White wins the semeai.  Black A was an overplay, but this variation is a win for White in any case.]
)
(;B[pg];W[ph];B[oh];W[rg];B[pf];W[ri];B[rk];W[sh];B[rj];W[qi];B[sj];W[si]
;B[sf];W[rf];B[re];W[ng];B[se];W[lj];B[sg];W[oi]
C[This result is a 1 move step ko -- a success for White.])
(;B[qi];W[rg];B[ri];W[re];B[rd];W[nf]
C[White is connected.])))
(;B[ph];W[oh];B[oi];W[pf];B[qf];W[qe];B[re]
C[This result is slightly better for Black, compared to the actual game.]
))
(;B[nf];W[ej];B[dl];W[go];B[fn];W[ai];B[ch];W[eh]
C[Black is dead.]))
(;W[ej];B[dl];W[go];B[ll];W[fn];B[fm];W[dm];B[ai];W[ah];B[ch];W[ak];B[eh]
(;W[jn];B[kn];W[kl];B[in];W[hn];B[kk];W[lk];B[kj];W[ki];B[jj];W[ij];B[km]
;W[mm];B[ji]
C[White is going to die in the center.])
(;W[kl];B[km];W[mm];B[kk];W[lk];B[kj]
C[White's group in the center dies.])))
(;B[bh]
C[The biggest move is here on the left side.];W[ci];B[ch];W[pb];B[ra]
C[Black is winning by about 10 points before komi.]))
(;B[ai]
C[Covering on the left side is dangerous for Black.];W[bi];B[ah];W[bh];B[ag]
;W[ei];B[eh];W[ej]LB[fh:A][di:B]
C[A and B are miai.]))
(;B[ie];W[ke];B[gc];W[gb];B[hc];W[cc];B[hb]
C[Black is alive on the upper side.  This result is an easy win for Black.]
))
(;W[ib];B[jd];W[ic];B[cc]LB[lb:A]
C[Black can later cut at A for some extra forcing moves from the right.]
))
(;W[jl]
C[A thick move, giving White a living shape in the center.]))
(;W[mh];B[mg];W[ng]
(;B[nf];W[qj];B[og];W[sn];B[rm];W[pp];B[op];W[sr];B[oq];W[or];B[pq];W[rk]
C[This result is similar to the earlier variations of White's 106, in which White has a ko on the right side.]
)
(;B[og];W[nf];B[oh];W[md]TR[nf:ng][og:oh]
C[The marked exchange gives White some potential to attack in the center.]
)))
(;W[cf];B[bf];W[ce];B[be];W[cc];B[cg];W[mh];B[mg];W[ng];B[og];W[nf];B[oh]
;W[md]LB[cf:A][mh:B][qj:C]
C[White presses at A, forcing Black into a low position on the left.  When White pushes through at B, White has the forcing move at C (see the earlier variation for move 106), so Black must answer from inside.  White has a small lead in this variation.]
))
(;W[sn]
C[I thought of this hane, but ultimately it is not successful.  Black has 3 ways to answer locally.]
(;B[rk]LB[sn:A]
C[The correct response to A.  Now the question is, how much aji does White have in the corner?]
;W[pp]
C[White tries to reduce Black's liberties with this cut.]
(;B[pq]
C[Pushing through here is a mistake.];W[oq];B[op];W[sr];B[ps];W[or];B[sq]
;W[sp];B[sm];W[no];B[rs];W[nq];B[pp];W[os]LB[pq:A]
C[White is just one step away from a direct ko, so this result is good for White.  Black's mistake was the normal looking move at A.]
)
(;B[op]
C[Playing atari from above is correct.]
(;W[sr];B[oq]
C[Black makes an eye with this move.]
(;W[rs];B[or];W[qs];B[pq];W[os]LB[ps:A][sq:B][sp:C][sm:D][ns:E][hs:F]
C[This is not a direct ko, in that even if White fills at A, Black can get a second ko with B, White C, Black D.  Also, Black has local ko threats at B and E.  And finally after Black wins the ko, Black can then kill White's group on the side with a play at F.  This ko is not a good result for White.]
)
(;W[or];B[pq];W[rs];B[qs]
C[This result will be a double ko or an approach move ko.]
(;W[sm];B[sq];W[sp];B[ss]LB[ps:A][no:B][nq:C][sn:D][rk:E]
C[White must fill A, B, and C to make this a ko, so it is too distant to be effective for White in most cases.  I would say that White's hane at D has been refuted by Black's reply at E, this being the reason that White D does not work.]
)
(;W[ps];B[sq];W[sp];B[sm]
C[Black wins with a double ko.])))
(;W[pq];B[sq]
C[White has not gained anything on the right side, and this squeeze is not good enough for White.]
)))
(;B[sm]LB[qj:A][sp:B]
C[When Black answers White's hane here, White has a forcing move at A to make potential on the right side, and also can force with B to squeeze in the corner, so this will end in a good result for White.]
;W[pc];B[qc];W[qd];B[pe];W[qb];B[rc];W[oc];B[rb];W[qm];B[rm];W[mh];B[mg]
;W[ng]
(;B[og];W[nf];B[oh];W[ld];B[me];W[md];B[ne];W[sp];B[rk];W[pp];B[op];W[pq]
;B[sr];W[ic]LB[sn:A][sm:B][qj:C]
C[In this variation, White's original hane at A, exchanged with Black B, has created potential to force with C, as well as creating the squeeze from the corner shown here.

To summarize, Black has been forced to play too many moves to protect the right side and this is good for White, so Black B was not the correct response.]
)
(;B[nf];W[qj]
C[Two variations follow, both of which are good for White.]
(;B[og];W[sp]LB[sn:A][sm:B][qj:C]
C[When White exchanged A for Black B, White was setting up this ko, making C a forcing move.  This is bad for Black.]
)
(;B[so];W[og]
C[Black collapses.])))
(;B[sq]
C[Black's 3rd way to reply.  But the result will be bad, because White has forcing moves on the right side.]
;W[pg]
C[White attaches to make most use of the various forcing moves on the side.]
(;B[pf];W[pi]
(;B[ph];W[rm];B[qm];W[sl];B[rk];W[rj];B[qj];W[sk]
C[White gets a ko.])
(;B[rk];W[og]
C[I'm not sure about this fight, but I was ready to try it at the time.]
))
(;B[pi];W[qj]LB[rm:A][qm:B][sl:C]
C[White threatens a ko with A, Black B, White C.];B[rm];W[qf];B[qh];W[qc]
C[White will get a solid territory in the corner.  This is good for White.]
)
(;B[qf];W[pi]LB[rm:A][qm:B][sl:C]
C[White 2 threatens the ko with White A, Black B, White C.];B[rk];W[mh];B[mg]
;W[ng];B[og];W[nf];B[oh];W[od];B[pc];W[pe];B[qe];W[pf];B[ph];W[qh];B[qi]
;W[rh];B[qj];W[oc]
C[White is getting good shape on the outside.]
(;B[le];W[qd];B[qc];W[rd];B[re];W[rc];B[rb];W[qb];B[pb];W[ra]
C[The corner becomes a ko.]
(;B[qa];W[sb]
C[Good for White.])
(;B[sb];W[pa];B[ob];W[nb]
C[Good for White.]))
(;B[ob];W[nb];B[pb];W[ld]
C[Good for White.]))))
(;W[qj]
C[I did not even think of this simple move, which is actually effective.  White makes miai of the right side and the lower right corner, as the following variations show.]
(;B[og];W[sn]
(;B[rm];W[pp]
(;B[op];W[sr];B[oq];W[or];B[pq];W[rk]LB[op:A][oq:B]
C[Playing A and then B is the tesuji to make an eye, and works for Black in almost all the variations.  But in this case, Black's right side group becomes a ko, so this result is good for White.]
)
(;B[pq];W[oq];B[op];W[sr];B[ps];W[or];B[sq];W[sp];B[sm];W[no];B[rs];W[nq]
;B[pp];W[os]
C[White is only one step away from a direct ko.  And also, Black's group on the right side is in danger, so this result is good for White.]
))
(;B[sm];W[qm];B[rm];W[sp]
C[White gets a ko.])
(;B[sq];W[rm];B[qm];W[sl]
C[Ko is good for White.]))
(;B[so];W[qf]
C[The tesuji to reduce Black's side.]
(;B[pg];W[rg];B[pf];W[qe];B[pe];W[rc];B[rh];W[qb]
C[White lives in the corner.])
(;B[qe];W[pf];B[rf];W[rg];B[rh];W[pg];B[qh];W[od]LB[mh:A][re:B]
C[White has aji at A and B, and should be able to make good shape in this fight.]
)
(;B[pf];W[qe];B[pe];W[rg];B[qh];W[rc];B[rh];W[pb]
C[White scoops out the corner.])
(;B[rf];W[qe];B[pg];W[re];B[rg];W[qc]
C[Taking the corner here is better for White than the game sequence.]))))
(;W[gn];B[hm];W[gm];B[ik];W[il];B[jl];W[ij];B[hk];W[hl];B[kk];W[jj];B[kj]
;W[ki];B[ji]
C[This fight is dangerous for White.])
(;W[gj];B[fp];W[ep];B[eq]
C[This cut is a tesuji.];W[dq];B[gr];W[er];B[gm];W[hm];B[gn]
C[Black has a living shape now.]))
(;W[dn];B[cq];W[fm];B[dq];W[fp]TR[ln][jo:ko][gp:gq]LB[hk:A]
C[White can probably capture the fivw marked stones, but a lot of bad aji remains.  At the least, Black can force from the center with moves such as A.  This result is not good for White.]
))
(;B[mo];W[oj];B[ph]
C[Black continues to attack in the center.]))
(;W[ol];B[mk]
C[Black attacks from the center.  This result is good for Black.]))
(;B[nr];W[mp];B[nq];W[ln];B[jq];W[jp];B[jr];W[io]
C[White has good shape.]))
(;W[kn];B[jo];W[lp];B[jn];W[km];B[gq];W[fp];B[go];W[jr];B[il]LB[lp:A][jr:B]
C[By forcing White to connect at A and B, Black can make good shape on the outside.]
))
(;B[pp];W[mr];B[nr];W[mp];B[nq];W[mn]
C[Good for White.]))
(;W[gq];B[lp];W[kp];B[kq];W[mr];B[mq];W[lr];B[nr];W[oq];B[nq];W[lo];B[mp]
;W[jq];B[ko];W[jp];B[ln]
C[White is overconcentrated on the lower side.]))

