(;FF[4]
CA[UTF-8]
GM[1]
DT[2021-09-10]
GN[uestc.zack vs. Karthus]
PC[https://online-go.com/review/742428]
PB[uestc.zack]
PW[Karthus]
BR[4k]
WR[3k]
TM[1200]OT[5x30 byo-yomi]
RE[W+R]
SZ[19]
KM[0.5]
RU[Japanese]

;B[pp]
;W[cc]
;B[dp]
;W[qd]
;B[oc]
;W[pc]
;B[od]
;W[qf]
;B[kd]
;W[cq]
;B[dq]
;W[cp]
;B[do]
;W[bn]
;B[nq]
;W[df]
;B[cm]
;W[ic]
;B[cj]TR[bm]C[The thing to understand is that this extension by black is weird, because this side of the board is not the widest open side, and black is trying to make tiny points where even already potentially undercut at triangle.]
;W[je]
;B[iq]
;W[cn]
;B[dn]
(;W[dm]TR[cj]C[So because Black C10 was weird, I don't like this cut at all, because it turns black's C10 stone into a good move. See variation.]
;B[cl]
;W[em]TR[cj]TR[cl]TR[cm]C[At this point, black is happy to have C10, it's a reasonable extension from C8, strengthening black's weakest stones and starting to get a base. Only a 1-point jump, not a 2-point jump, but still good.]
;B[cr]
;W[br]
;B[dr]
;W[bs]
;B[fn]
;W[dk]
;B[ck]
;W[fk]
;B[cg]
;W[cf]
;B[dj]
;W[ek]
;B[bm]
;W[co]
;B[dg]
;W[eg]
;B[bg]
(;W[bf]TR[fh]C[Yes, closing at F12 instead would be fine. Probably good, since it means white doesn't have any weak groups, which will make it easier to invade/reduce the bottom.]
;B[eh]
;W[fh]
;B[fg]
;W[ef]
;B[fi]
;W[gh]
;B[ei]
;W[gi]
;B[gj]
;W[fj]
;B[gk]
;W[gl]
;B[hl]
;W[gm]
;B[hm]
;W[gn]
(;B[go]TR[gj]TR[gk]TR[hl]TR[hm]C[This feels like wrong direction, black's center four stones are the weak stones here, with a cut and very few liberties, and black is squeezing the toothpaste.]
;W[hn]TR[gj]TR[gk]TR[hl]TR[hm]C[Very satisfying for white to come out here.]
;B[ij]
;W[ho]
;B[gp]
;W[hp]
;B[hq]
;W[fm]C[Most obvious big mistake up to this point in the game, by far. This threatens nothing in gote!]
(;B[en]C[And black defends basically nothing in gote! Lucky for white.

End of this review.]
;W[jp]
;B[hi]
;W[hg]
;B[hh]
;W[gg]
;B[ig]
;W[if]
;B[hf]
;W[gf]
;B[jf]
;W[ie]
;B[jg]
;W[ke]
;B[jm]
;W[jn]
;B[km]
;W[jq]
;B[kn]
;W[jo]
;B[qm]
;W[of]
;B[ld]
;W[mf]
;B[jc]
;W[ib]
;B[jb]
;W[pb]
;B[ob]
;W[jr]
;B[gr]
;W[pl]
;B[lq]
;W[lr]
;B[mr]
;W[ls]
;B[kq]
;W[kr]
;B[js]
;W[ir]
;B[is]
;W[hs]
;B[hr]
;W[ks]
;B[is]
;W[fq]
;B[gq]
;W[fp]
;B[fr]
;W[eq]
;B[er]
;W[lp]
;B[kp]
;W[ko]
;B[mq]
;W[ln]
;B[lm]
;W[mn]
;B[mm]
;W[nn]
;B[mp]
;W[lo]
;B[nm]
;W[on]
;B[om]
;W[pm]
;B[pn]
;W[po]
;B[qn]
;W[qo]
;B[qp]
;W[ro]
;B[ql]
;W[op]
;B[oq]
;W[rq]
;B[rp]
;W[sp]
;B[qr]
;W[qq]
;B[pq]
;W[rr]
;B[qs]
;W[rs]
;B[or]
;W[ns]
;B[pk]
)(;B[jm]
(;W[fo]
;B[fp]
;W[en]
;B[eo]C[White gets no eye and barely any points.]
)(;W[en]
;B[eo]
;W[fo]
;B[fp]C[Same thing.]
)))(;B[gp]C[This would already be better, less damaging when white comes out.]
)(;B[hn]C[AI suggests this one, which while also squeezing toothpaste, follows the correct principle of playing from the weakest stones.]
;W[go]
;B[hp]C[And it turns out white is basically just dead here, although the reading is tricky.]
(;W[fp]
;B[fq]
;W[gq]
;B[gp]
)(;W[fq]
;B[gp]
;W[fp]
;B[fo]
)))(;W[fh]
))(;W[bm]
;B[cl]TR[cj]C[At this point, I like this way for white, then take sente. Black's triangled stone is clearly wasted. 

If the triangled stone weren't there already, it would be a reasonable shape, about even for both sides, but obviously black would never then play the triangled stone.
]
;W[ke]
))