Hi Diogo
I always need to clean your files before I can make a commentary. Anyone knows what's the root cause?
Anyway, here it is:
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]TM[1500]OT[5x30 byo-yomi]
PW[WhatLadder]PB[Diogo]WR[5k]BR[5k]DT[2019-04-22]PC[The KGS Go Server at http://www.gokgs.com/]C[In this commentary, I will discuss
- strategy and consistency when executing it
- sente
- endgame]RE[W+17.50]
;B[pd]
;W[dd]
;B[qp]
;W[dp]
;B[fq]
;W[cn]
;B[kq]
;W[nc]
;B[qf]
;W[jd]
;B[cf]
;W[ch]
;B[cc]
;W[dc]
;B[cd]
;W[de]
;B[bf]
;W[eg]C[Until here this is a natural opening]
;B[ne]C[This emphasizes central influence]
;W[ld]TR[nc][jd][ld]SQ[pd][ne][qf]C[giving territory
Comparing the marked stones, White's are more efficient]
;B[lf]C[But here's the first real mistake, in my opinion. Black increases his influence but doesn't threaten anything against White. It's a single purpose move and White has his hands free (sente) to jump into the moyo. Worse, White has 1 obvious place to play.]
;W[qk]LB[qh:A][qn:B]C[creating equivalent options for making a base]
;B[qm]
;W[qh]
;B[pi]
;W[qi]
;B[pk]C[These moves are consistent with your quest for central influence]
;W[rl]
;B[ql]
;W[rj]
;B[jf]C[as is this one
However, the threat against White's territory is not big enough]
;W[op]C[So again, White has his hands free to invade (sente)]
;B[oq]C[Major tactical mistake: attaching to a stone you want to attakck]
;W[nq]
;B[pq]
;W[nn]C[White creates a light structure, hard to kill wholesale]
;B[mp]C[making heavy, ok]
;W[np]
;B[nl]C[attack from a distance, ok]
;W[mo]
;B[lm]C[attack to make central territory
The whole strategy is consistent, but making central territory is in general a bad strategy because it's so easily reduced]
;W[lp]
;B[lq]
;W[mq]
;B[jp]C[good]
;W[ko]
;B[jo]
;W[kn]
;B[jl]C[not bad]
;W[pn]
;B[qn]
;W[jn]
;B[hf]C[Still consistent
Though the wrong strategy IMO, being consistent is better than constantly changing ideas.]
;W[iq]
;B[dq]C[nice leaning!]
;W[cq]
;B[hp]
;W[ip]
;B[io]
;W[ho]
;B[hq]C[good style]
;W[in]
;B[hn]
;W[go]
;B[ir]LB[hn:1][go:2]C[good to come back here, but why make the 1-2 exchange first?]
;W[ep]
;B[id]C[good follow up!!!]
;W[ic]
(;B[jc]
;W[kc]
;B[hc]
;W[jb]
;B[hd]
;W[hl]C[in revenge, White plays on the border of 2 moyos]
;B[ij]C[this move makes a statement: "if we both solidify, I will win"
]
;W[gj]C[White accepts the challenge]
;B[fi]C[and then you change your mind: you play behind enemy lines (consistency)]
;W[gi]
;B[bh]C[and then change your mind again, as you now reduce from the other side
]
;W[ci]LB[bh:3][fi:2][ij:1]SQ[ci][gi][gj]C[as can be clearly seen, the last 3 black moves were inconsistent
compare with White's 3 moves (squared)]
;B[bi]
;W[cj]C[your consistent reduction at the bottom is good in itself though!]
;B[ph]LB[fi:A][hi:B]C[this move is consistent with your earlier plan
Now imagine A had been played at B, then all your stones would have told the same story]
;W[pl]
;B[ok]
;W[pm]
;B[rm]
;W[sm]
(;B[rn]LB[sn:A]C[I know where this move comes from: you saw that A was bad
See var]
;W[pb]C[White takes a very big point]
;B[qc]
;W[qb]
;B[hh]C[consistent move and threatening to unlock the stone behind the lines]
;W[fh]C[This defines all the territories and we could say the real engame has started
I leave this as an exercise
1) How many points does each side have?
2) Where are the big moves?
3) And where are the weaknesses (so that the moves are likely to be sente)?
See my answer in the variation]
(;B[al]C[The monkey jump is (overly) popular in the endgame.]
;W[bm]
;B[bk]
;W[ck]
;B[bj]C[Black ends in gote, which is usually a bad thing for a first endgame sequence. You should be able to execute some endgame in sente
Black gained about 10 points here]
;W[qg]C[White takes sente and secures his group]
;B[pg]
;W[rf]
;B[fp]C[you take sente, good!]
;W[fo]
;B[qe]C[but then gote again]
;W[eq]C[and White takes the biggest point]
;B[fr]
;W[er]
;B[es]C[the hane connect is usually sente ...]
;W[ds]
;B[fs]C[but not this time!]
;W[nr]C[and White has seen it
He now takes sente to threaten your weakest group]
;B[or]
;W[lr]
;B[db]C[you take the last big endgame, but you are already behind now
Go to 150]
;W[eb]
;B[cb]
;W[hb]
;B[df]
;W[ef]
;B[re]
;W[rg]
;B[hk]
;W[gk]
;B[bl]
;W[cl]
;B[dg]
;W[dh]
;B[am]
;W[an]
;B[rb]
;W[ra]
;B[rc]
;W[sn]
;B[so]
;W[sl]
;B[rp]
;W[kr]
;B[jq]
;W[gp]
;B[mc]
;W[md]
;B[pc]
;W[oc]
;B[il]
;W[hm]
;B[sf]
;W[sg]
;B[ce]
;W[gc]C[This is a big turn
Black has an interesting move now; see var
THen go to end of game]
(;B[gd]
;W[fd]
;B[fc]
;W[gb]
;B[fe]
;W[ed]
;B[je]
;W[cg]
;B[bg]
;W[se]
;B[sd]
;W[hj]
;B[ik]
;W[gq]
;B[gr]
;W[me]
;B[mf]
;W[od]
;B[oe]
;W[gf]
;B[ge]
;W[gg]
;B[hg]
;W[hi]
;B[ii]
;W[mm]
;B[ml]
;W[km]
;B[kl]
;W[ln]
;B[ll]
;W[qo]
;B[ro]
;W[po]
;B[pp]
;W[os]
;B[ps]
;W[ns]
;B[qr]
;W[ke]
;B[kf]
;W[jr]
;B[js]
;W[ks]
;B[is]
;W[da]
;B[ca]
;W[ea]
;B[sb]
;W[nm]
;B[ol]
;W[om]
;B[sa]
;W[ob]
;B[qa]
;W[pa]
;B[le]
;W[kd]
;B[nd]
;W[mb]
;B[ff]
;W[ee]
;B[pj]
;W[qj]
;B[ra]
;W[sf]
;B[gh]
;W[fg]
;B[gl]
;W[fl]
;B[im]
;W[gm]LB[db:D][hb:F][rb:E][ec:6][lc:5][qg:C][ei:3][li:1][bj:B][gn:2][eq:A][dr:4]SQ[fc][mc][fi][hn][dq]C[The marked stones all show sacrificed stones, without gain. Sacrificing stones can be good, if you take something at the other side
You focused on the creation of a centre (1) , which is a doubtful strategy (big centres should develop "naturally" as a side effect of attacks)
But the real problem lied in allowing White to grow his territories by
2 uncalled for atari
3 inconsistent strategy
4 thinking the hane connect is always sente
5 no particular reason
6 there was a better move
Of the 6 big endgame moves you took 3 (B, D, E). That's not bad, but it could have been better, since you were in charge at move 95])
(;B[fd]
;W[gd]
;B[ge]
;W[fe]
;B[fb]
(;W[ea]
;B[ec]LB[gb:A][ee:B])
(;W[fc]C[White must play here]
;B[ea]
;W[ec])
(;W[ec]
;B[fc]
;W[gb]
;B[ea]
;W[ee])))
(;B[]LB[db:D][hb:F][rb:E][df:1][qg:C][bj:B][eq:A]C[Black
- centre: 30
- top left: 10
- bottom:12
- bottom right: 10
total 62
Black's major weakness is the bottom right, where the lump of stones and the open box in the corner present corner aji
White:
- top: 13
- centre left 30
- lower left corner: 10
- right: 5
- high right bottom: 4
- komi: 6,5
total 58,5
White's major weakness is the small group on the right side;
and there's potential danger in the cut at 1
The biggest move on the board is surely A, which adds/removes points to either territory
B is a big move too, doing something about both territories
C is not so big but may be sente as it threatens White's weakest group.
D enlarges Black's territory
So does E
and F keeps White's top disconnected
]))
(;B[ro]C[the shape move is here]
;W[so]
;B[sp]
;W[sn]
;B[rq]))
(;B[hc]
;W[hd]
;B[ie]
;W[gc]
;B[hb]LB[jc:A][gd:B]))
Alias, suspeito que o Diogo seja Portugues -
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DiogoBarbosa
is a mistake, she prefers S7 (puts pressure on the S10 group and builds a large corner) or something around N4. Apparently you let White settle too easily, you should have attacked the O6 group in order to make profit. After 
, LZ suggests to kill the S10 group with S13.