(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]TM[300]
GN[kobs-seqs jubango!]PW[seequ]PB[💖 KoBa 💖]WR[27k]BR[28k]DT[2021-02-14]PC[OGS: https://online-go.com/game/31106210]C[Review by Antti]RE[W+Time]
;B[qd]
;W[dc]
;B[pq]
;W[oc]
;B[cp]
;W[qo]
;B[np]
;W[pe]
;B[qe]
;W[pf]
;B[qf]LB[qg:A]C[Black should usually jump to A immediately, but this is a fairly small mistake.]
;W[pg]
;B[qh]
;W[cf]
;B[fp]
;W[hq]LB[jd:A][dk:B]C[It's hard to call h3 a mistake, too, but white's play up to this point suggests that white should like to build his framework on the upper side with A. After A, white can treat h3 and B as miai.]
;B[jq]
;W[dk]
;B[jd]TR[pe][pf][pg]C[Now it can be hard for white to make good use of his wall to the right, and it's possible that the marked stones just ended up giving free territory for black.]
;W[hc]
;B[mc]
;W[dp]
;B[dq]
;W[eq]
;B[ep]
;W[do]
;B[cq]
;W[fq]
;B[gp]
;W[hp]
;B[fn]
(;W[gq]LB[co:C][ho:B][dp:A]C[If white just ends up giving up the A stones, it was better for him not to play them in the first place – in this case, simply jumping to around B instead of A was better.

White in fact did have a way to save the A stones efficiently – see variation for C.]
;B[dn]LB[di:D][dk:C][do:A][hq:B]C[Now the A stones are cleanly captured, the B stones are not completely strong yet, and white C can also be attacked by a black pincer at around D.]
;W[qq]
;B[qr]
;W[jf]C[This cap would look better if there was something that white could build in the centre. As it is, however, it's likely k14 will simply drive black to strengthen his group without giving white much in exchange.]
(;B[qp]LB[hd:A]C[See variation for black A.]
;W[ie]LB[mc:A]C[White can be happy to get this point, since now the black A stones are actually getting under pressure.]
;B[ph]LB[jb:C][me:A][mg:B]C[Black should play something like A-B-C instead to get his group settled.]
;W[oh]
;B[oi]
;W[nh]
;B[ni]
;W[mh]TR[mc][jd][qo]C[Locally this shape looks natural, but what is actually happening here is that black is exchanging an attack on the one white stone at r5 for the attack on the two black stones on the upper side. What's more, the black two stones appear to be in more trouble than the one whtie stone, since the right side is more difficult for black to quickly consolidate into a big territory.]
;B[mi]
;W[lh]
;B[pb]
;W[ob]
;B[jo]
;W[hn]
;B[fk]LB[jm:A]TR[ph][mi][ni][oi]C[Black's play here is inconsistent with what he did earlier on the right side. Black should be playing from the A direction here and looking to turn the right side into a huge territory.

Compared to A, black f9 suddenly seems to be saying that white's centre potential is bigger after all – but in this case, the black pushes on the right side stop making sense.]
(;W[jm]C[K7 is generally playing in the right direction, but this kind of a cuttable keima will often turn out to be scary or dangerous.

See variation.]
;B[in]LB[im:A][jn:B]C[Since black has the ladder here, the A-j6-B cut was in fact slightly better – it leaves black with better shape in the end.]
;W[im]
;B[hm]
;W[gm]
;B[hl]
;W[gn]
;B[en]LB[gl:A][fm:B]C[Black should have exchanged A-B before this.]
;W[gl]
;B[gk]
;W[hk]
;B[il]
;W[fl]
;B[ho]
;W[li]LB[hj:D][ij:C][hk:F][ik:B][jk:A][el:G][jl:E]C[This turn is too disconnected from the centre fight. White should have done something more direct such as A-B-C-D-E-F-G instead.]
(;B[jl]LB[ik:A]C[Black had a great chance with A here. See variation.]
;W[el]
;B[fi]LB[hj:B][km:A][jr:C]C[Black should most likely go for a trade with something like A-B-C instead.]
;W[hj]
;B[dj]
;W[cj]
;B[di]
;W[ci]
;B[ii]LB[il:A][km:B]C[Given the fact that the black A stones just aren't very strong yet, this black's way of fighting in the centre just cannot work out. This is why reinforcing with B was/is so valuable.]
;W[jk]
;B[kl]
;W[jj]
;B[ch]
;W[dh]
;B[ck]
;W[cl]
;B[bk]LB[dg:A][eh:B]C[According to the AI, black had to play A-B first and then fight like crazy, but anyway there would be nothing obvious that instantly works. To be able to play out a fight like this, you need really solid reading skills and lots of time to think.]
;W[bh]
;B[bi]
;W[cg]C[bugcat: [object Object\]
]
;B[bj]
;W[ch]C[Now it looks like black is just busted.]
;B[bl]
;W[cm]
;B[bm]
;W[cn]
;B[co]
;W[bn]
;B[dl]
(;W[ek]LB[dm:A]C[White could in fact have captured with A. See variation.]
;B[dm]
;W[fj]C[Now the game is a lot closer than it should have been, but white still seems to hold the lead.]
;B[cc]LB[jr:A]C[Black should just go back to kill the lower-side white stones with A instead.]
;W[dd]LB[db:B][cf:A]C[When the white A stones have been reinforced this much, usually the B descent instead is the cleanest way to kill the corner – but d16 does work, too.]
;B[db]
;W[eb]
;B[bb]
;W[bd]
;B[pc]
;W[od]
;B[ea]
;W[fb]
;B[nk]LB[mk:A][ip:B]C[In this area, A instead is clearly better.

However, since white can still play at A to live on the lower side, that should come first after all.]
;W[rq]
;B[rp]C[torusle: oh wot...
]
;W[pp]C[torusle: finland title match?
]
;B[rr]
;W[ip]
;B[io]
;W[jp]
(;B[kp]LB[kq:A]C[If white lives on the lower side, black just cannot have enough territory to win the game. Therefore, black should actually try to go for the kill with A instead here – see variation.]
;W[kq]
;B[lp]
;W[ko]
;B[km]
;W[lq]
;B[jr]LB[mq:A]C[Now black had to play A instead, but white would of course live anyway.]
;W[mp]C[torusle: dafuq lower right corner...
]
;B[lo]
;W[mo]
;B[ln]
;W[nq]
;B[lr]
;W[kr]
;B[ks]
;W[mq]LB[jf:I][li:E][gk:C][hk:D][ik:F][jm:G][ip:H][kp:A][kq:B]C[In a sense we can maybe say that A was the last black losing mistake – most likely white was better anyway, but the life-and-death battle after black B instead of A could have been surprisingly complicated, and might still well have ended up in white accidentally dying.

Still, arguably the most important fight for this game was in the centre at around C and D. There, white E briefly gave a great move for black at F, which could have taken control of the centre fighting. Instead, however, the black C stones ended up getting disconnected from the rest of the black stones, and then black also tried to save them too early when there were too many important open questions remaining, such as the fate of the white G stones and the weakness of H. Black's going for an early living sequence with C let white otherwise reinforce his position in the area, and subsequently made it easier for white to take control of the fighting – we could say that black went for territorial profit (saving the C stones) when influence and group strength should instead have been prioritised.

For white, besides some of the reading-technical details in this game, I'd also like to highlight G and I as a potentially dangerous type of a move. Both G and I are heavily invested in a certain kind of plan, and they both leave obvious weaknesses for the opponent to go for. Therefore, both of these moves should only be played when white is exactly sure of what he wants, and this should be backed up by fairly precise reading.

When the above is not the case, instead of G and I, white should play similar moves in the area, but such that don't leave obvious weak points for the opponent to make use of. In AI terms, this may from time to time cause slightly inefficient moves and shapes, meaning small losses according to KataGo, but the important counterpoint is that then the game stays controllable and understandable from a human view point.

The review ends here!])
(;B[kq]
;W[kp]
;B[lq]
;W[ko]
;B[km]
;W[ir]
;B[er]
;W[fr]
;B[dr]
;W[mo]LB[oq:A]C[Most likely, due to white's forcing moves at around A, there is just no way for this white group to die – but for now there's no clear two eyes either, so probably this is black's best shot at aiming for a white mistake.]))
(;W[dm]
;B[ek]
;W[dl]
;B[go]TR[em][fm][an][bo]C[It may be true that white only has four liberties against black's five on the left side, but...]
;W[an]
;B[bo]
;W[gj]C[...what about the black stones in the centre?]
;B[ei]
;W[fj]
;B[ej]
;W[gh]C[White wins by one liberty.]))
(;B[ik]LB[hj:A][el:B]C[Now A and B are miai for capturing white stones.]
;W[el]LB[fl:A]C[White obviously cannot sacrifice the A stones, but...]
;B[hj]LB[di:A][kk:B][jr:C]C[...when black captures here, he is instantly alive in the centre, and can next look at attacking moves such as A, B, and C. Now it looks like white's position has fallen apart.]))
(;W[im]LB[jm:A]C[White j7 looks slower than A by comparison, but this also has many merits: for one, white can keep his weak group in one piece, and j7 does in fact also create lots of potential eye shape for white.]
;B[km]C[Black will presumably cap here, and...]
;W[rp]C[...I would now proceed to invade the right side, as the lower-side white group cannot really be killed.]
;B[rq]
;W[pp]
;B[qq]
;W[qm]C[This would in general look like a nice position for white to play – black has to find a really severe attack against white on the right side, or he just lost his main territory.]))
(;B[hd]
;W[gd]
;B[he]
;W[ic]
;B[je]
;W[kb]
;B[kc]
;W[lb]
;B[me]LB[jf:A]C[Something like this could follow, with white slightly increasing his territory on the upper side, but with the black group also becoming completely strong and the A stone getting kind of wasted.]
;CR[he]AE[kb][lb][ic][kc][gd][hd][je][me][jf]AW[he]LB[kc:A][me:B][jf:C]C[By comparison, a move such as h15 is easier to play – this improves the white position and pressures the black group without committing to a single particular kind of result – this way, white can more easily change his mind later if necessary, and h15 is anyway a nice move to have.

For example, later white might attack black's eye base directly with A for a territorial line of play, or he could attack black from above with B or C.]
;CR[me]AE[he]AW[me]C[The AI, incidentally, likes this n15 cap. This is because the AI judges that if black gets to play at around n15, the black group is getting strong quickly and at the expense of the upper-right corner white group's well-being. In other words, n15 can be a kind of key point for attack and defence for both players – but, of course, playing it only makes sense if you can agree that black's n15 would be dangerous against the white group.]))
(;W[co]
;B[gq]C[There are two cutting points here, alright, but it's not too easy for black to make use of them.]
;W[gr]
;B[hr]LB[dr:D][er:B][fr:A][fs:C]C[If black cuts at A instead, white captures a stone with B-h2-C and then proceeds to live with D.]
;W[ir]
;B[fr]
;W[hs]
;B[er]LB[dk:B][hr:A]C[Black can link up like this, but he has to sacrifice a stone at A for a white ponnuki, making it easy for white to live on the lower side. Note that now also the white B stone is fairly well positioned.]))
