(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[AGA]SZ[19]KM[0.50]TM[3600]OT[15/300 Canadian]
PW[jlt]PB[opponent]DT[2021-04-11]RE[W+Resign]
;B[pd]
;W[dd]
;B[pp]
;W[dq]
;B[do]
;W[co]
;B[cn]
;W[cp]
;B[dn]
;W[fq]
;B[cj]
;W[qf]LB[qc:A]C[-0.8 point. I did consider the move.]
;B[qh]
;W[qc]
;B[qd]
;W[pc]
;B[od]
;W[rd]
;B[re]
;W[rc]
;B[rf]
;W[nc]
;B[nd]
;W[mc]
;B[fc]
;W[cf]LB[ec:A]C[Katago prefers the kick. The game move loses 0.6 point. Not clear to me why a joseki is better than another.]
;B[db]
;W[cc]LB[qn:A]C[Followitis.

I didn't think about "a" which is 0.5 point better. I tend to forget that josekis don't need to be finished immediately but may be interrupted and resumed later, unless it is really urgent to finish them.]
;B[ic]
;W[qp]
;B[qo]
;W[qq]
;B[pq]
;W[ro]
;B[rn]
;W[qn]
;B[po]
;W[rm]
;B[rp]
;W[sn]
;B[rq]
;W[qr]
;B[rr]
;W[jp]LB[qj:A]TR[qf]C[Failure to look at the opponent's weakness.

Loses 1 point. I thought the ponnuki was reasonably safe and that I should play on the bottom to prevent Black from making an extension but apparently "a" is better. Not only it defends the ponnuki but also it aims at exploiting the aji of R14.]
;B[pn]
;W[pm]
;B[ql]
;W[qm]
;B[om]
;W[pl]LB[qg:A]C[Failure to look at the opponent's weakness and difficulty to read the position.

The game move loses 0.8 point. Katago's suggestion was not on my radar and is difficult to understand for me without deep reading.]
;B[qk]
;W[ol]
;B[nm]
;W[no]LB[pj:A]C[Wishful thinking.

Loses 2.2 points. I did think about "a" (and in fact I played it 2 moves later) but thought I could play O5 in sente first - however it wasn't sente.]
;B[ml]
;W[pj]
;B[qj]
;W[nj]LB[pi:A]C[Shape problem + not reading push and cut.

Loses 0.7 point. I know  that "a" is good shape because it prevents Black from making a tiger's mouth. Didn't realize that "a" is sente because if Black doesn't respond then the push and cut is interesting. However this is difficult to read for me.]
;B[lp]
;W[lo]
;B[kp]
;W[ko]
;B[jq]
;W[iq]LB[mp:A]C[Chickening out.

"a" was 2.3 points better. I thought about it but was afraid to be disconnected but shouldn't forget that Black is also weak so White can fight.]
;B[mp]
;W[io]LB[jr:A]C[Loses 0.9 point. I thought about "a" but I was afraid of the counter-atari K5. It is still not clear to me why "a" is better than the game move.]
;B[jr]
;W[mo]
;B[ir]
;W[on]LB[np:A]C[Failure to consider endgame moves before move 100.

Loses 1.8 point. The central black group is not really in danger, it can escape by starting with an attachment at N10. I didn't play "a" because I thought I had no severe attack against the bottom group. And indeed Katago thinks that Black would just respond at O2 and White would tenuki. So it's just a sente endgame move. Even though we are only at move 70, some endgame moves may already be interesting.]
;B[kl]
;W[hl]LB[np:A]C[Loses 1 point. Katago still wants "a".]
;B[ki]
;W[ph]LB[np:A]C[Loses 1.1 point. Katago still wants "a".]
;B[qg]
;W[pg]LB[np:A]C[Loses 1.6 point. Katago still wants "a".]
;B[cb]
;W[ch]LB[pf:A]C[Loses 0.8 point. Katago wants "a". Of course I thought about it because it threatens the cut at R15 but wasn't sure Black would respond, and I was afraid of Black playing at C12 which could become annoying if Black continues with B16. In addition I thought White C12 threatens C8 next.]
;B[ci]
;W[dh]LB[pf:A]C[Loses 0.7 point. Katago still wants "a".]
;B[bn]
;W[qi]LB[pf:A]C[Loses 2.5 points. Katago still wants "a".]
;B[ri]
;W[pi]
;B[sk]
;W[np]
;B[pr]
;W[mq]LB[lk:A]C[Fundamental flaw in my fighting technique. To attack a group I know I have to surround and attack the opponen't shape, however I don't think enough about the latter.

Loses 1.6 point. Katago wants to spoil Black's shape with a double peep. I know this move but not well enough to play it with confidence, and didn't bother to read variations far enough.]
;B[lr]
;W[lq]LB[hd:A]C[Failure to think about tenuki.

Loses 1.5 point. Didn't think at all about tenuki. Maybe this is a leaning attack against the central black stones.]
;B[kq]
;W[nr]LB[lk:A]C[Loses 1.5 point. Katago still wants "a".]
;B[mr]
;W[nq]LB[hq:A]C[Failure to sacrifice stones I invested in, instead of taking a bigger point elsewhere.

Loses 2 points. Katago thinks that "a" is bigger and White should let Black capture 2 stones.]
;B[gq]
;W[hq]
;B[hr]
;W[gr]
;B[gp]
;W[fr]
;B[ho]
;W[ip]
;B[ks]
;W[hn]LB[in:A]C[Shape.

"a" was 0.9 point better. This is just better shape.]
;B[fo]
;W[jm]
;B[bq]
;W[bp]
;B[cr]
;W[dr]LB[ap:A]C[Lack of life-and-death skill.

Loses 3.5 point. Didn't see that Black has a ko.]
;B[km]
;W[jl]
;B[mi]
;W[mg]LB[mj:A]C[Same as before. Failure to attack the opponent's shape.

Loses 1 point compared to "a". If Black responds with M10 then White K10.]
;B[ng]
;W[nf]LB[jj:A]C[Loses 1.3 point compared to "a".]
;B[ni]
;W[nh]LB[jj:A]C[Loses 2.4 points compared to "a".]
;B[oi]
;W[oj]LB[jj:A]C[Loses 2.4 points compared to "a".]
;B[pf]
;W[og]TR[jg][kg][jh][kh][lh][rh][ji][li][jj][kj][lj][rj]C[Followitis.

Big mistake. I didn't try every move but almost any move in the marked area was about 5 points better. I was focused on Black's last move and gave too much importance on an insignificant stone.]
;B[jj]
;W[hj]
;B[fl]
;W[fk]LB[ii:A]C[Followitis again.

Several moves were better. For instance the game move loses 2.5 points compared to "a". ]
;B[el]
;W[jg]
;B[kg]
;W[kf]
;B[jh]
;W[ig]
;B[ih]
;W[hg]
;B[ii]
;W[hh]
;B[ik]
;W[hk]
;B[jk]
;W[ek]
;B[dk]
;W[gd]
;B[gc]
;W[fd]
;B[hd]
;W[he]
;B[ie]
;W[hf]
;B[fi]
;W[hi]
;B[ej]
;W[fh]
;B[bc]
;W[bd]
;B[dc]
;W[cd]
;B[gk]
;W[ao]
;B[an]
;W[ap]
;B[lb]
;W[mb]
;B[oc]
;W[ob]
;B[lc]
;W[md]
;B[ld]
;W[le]
;B[je]
;W[mj]
;B[lj]
;W[lh]
;B[li]
;W[kh]
;B[bb]
;W[ij]
;B[lk]
;W[lm]
;B[kn]
;W[ln]
;B[jn]
;W[in]
;B[jo]
;W[ll]
;B[kk]
;W[mk])