(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]
GN[6 august 2026]PW[Cris Bratu]PB[Choong Hee Han]WR[5k]BR[5k]PC[https://online-go.com/review/1750299]RE[W+Resign]
;B[dq]
;W[qc]
;B[qp]
;W[cc]
;B[qe]
;W[od]
;B[pg]
;W[co]
;B[cp]
;W[do]
;B[fq]
;W[ck]
;B[lc]
;W[mc]
;B[mb]
;W[nc]
;B[le]
;W[oq]
;B[mp]
;W[pp]
;B[qo]
;W[qq]
(;B[qk]
;W[po]
;B[qn]
(;W[gc]
;B[rq]
;W[qr]
;B[nr]
(;W[kb]C[This exchange is not so good (it makes black much stronger)...]
;B[lb]
;W[kd]
;B[ld]
;W[kc]
;B[qd]
;W[rc]
;B[oa]
;W[pb]
;B[nm]
;W[rr]
;B[go]
;W[de]
(;B[ch]LB[nm:A][go:B]C[In my opinion this is an unnecessary invasion - it's hard for black to make a good base on the left.
And black just gives white a group to attack.
Because there is a weak group to attack, it will be much more difficult for black to get many points in the center (which black aimed for by playing at A and B).]
(;W[ek]
;B[be]
(;W[qh]C[This invasion seems unnecessary, because black wouldn't have there many points anyway (if black took the points on the right, white would be able to play the monkey jump at J14 in the endgame, so there wouldn't be many points left for black).

A bigger invasion would be on the bottom...]
;B[qg]
;W[pi]
;B[ni]
;W[rg]
;B[rf]
;W[ri]
;B[sg]
;W[sh]
;B[rh]C[It's very risky to make a ko shape without checking ko threats in advance.]
;W[oj]
;B[si]
;W[qj]
(;B[ph]C[Slow move (it's a move from a strong group).

Better to add moves next to groups, which are weaker, e.g. ...]
;W[rk]
;B[qi]C[Another slow move.

White can counter attack now...]
(;W[rj]
;B[ql]
;W[nj]
;B[oi]
;W[pj]
;B[lj]
;W[mj]
;B[lk]
;W[mi]
;B[kh]
;W[pm]
;B[ol]
;W[qm]
;B[pn]
;W[om]
;B[on]
;W[rm]
(;B[rp]C[Unnecessary exchange and waste of the potential ko weakness at T2...]
;W[or]
;B[sr]
;W[np]
;B[no]
;W[nq]
;B[ok]
;W[mg]
;B[nh]
;W[mh]
;B[ne]
;W[ng]
;B[kf]
;W[oh]
(;B[fm]C[This move doesn't really threaten white's group on the left.

So, a move to protect the bottom side is much bigger now...]
;W[mq]
;B[lp]
(;W[em]
;B[en]
;W[dm]
;B[gk]
;W[jr]
;B[kq]
;W[kr]
;B[iq]
;W[jq]
;B[jp]
;W[lq]
;B[kp]
;W[oe]
(;B[bp]LB[bm:C][bn:B][bo:A]TR[be][ch]C[Locally:
If after A-B, the move at C works, then it's usually better to start with hane...

Globally:
Two black stones marked with triangles are weaker than the white group on the bottom-left. And those stones also have the potential for getting endgame points in sente...]
;W[rd]
;B[pf]
;W[bo]
;B[cd]
;W[dd]
;B[bc]
;W[cb]
;B[gf]
(;W[ke]C[Order of moves...]
;B[lg]
;W[if]
;B[ig]
;W[hf]
;B[hg]
;W[jf]
;B[jg]
;W[ge]
;B[bb]
;W[ba]
;B[fe]
(;W[gd]
;B[fg]
;W[bf]LB[dc:A]C[There is a cut at A (it's safe for black anyway).]
;B[bg]
;W[cf]
;B[af]
;W[dh]
;B[bj]
;W[bk]
;B[di]
;W[eh]
;B[ce]
;W[ef]
;B[cg]
;W[df]
;B[ff]
;W[ad]
;B[ae]
;W[bi]
;B[ci]
;W[cj]
;B[ei]
;W[fh]
;B[fi]
;W[gh]
;B[gg]
;W[gi]
;B[ec]LB[dc:A]C[Blunder (black could have cut at A instead).]
;W[dc]
;B[ed]
;W[eb]
;B[fj]
;W[hj]
;B[hk]
;W[ij]
;B[ir]
;W[ik]
;B[il]
;W[jk]
;B[jl]
;W[mf]
;B[lf]
;W[li]
;B[ki]
;W[kj]
;B[of]
;W[kk]
;B[ll]
;W[kl]
;B[ni]
;W[rl]
;B[sj]
;W[nl])
(;W[ff]C[It's important to make this exchange...]
;B[gg]
;W[gd]
;B[ef]LB[dc:A]C[Cutting at A doesn't work now.]))
(;W[jg]
(;B[kg]C[If...]
;W[ke]
;B[mf]
;W[jf]C[Destroying more.])
(;B[jf]C[If...]
;W[kg]
;B[lg]
;W[lh]
;B[lf]
;W[ki]
;B[jh]
;W[ig]
;B[if]
;W[hg]C[Black's group on the top is still under pressure.])))
(;B[bo]
;W[bn]
;B[bp]TR[bm]C[Less points for white.])
(;B[bc]
;W[cd]
;B[bd]
;W[bb]C[This is the minimum.

But...]
;B[df]
;W[ef]
;B[ce]
;W[ee]
;B[dg]LB[fd:A]C[Even if black losses sente, black's group in the top-left would be safe, and there would be a potential for creating some problems in the white's shape at A.]))
(;W[kq]C[Keep going - it's huge.]
;B[dl]
;W[cl]C[There are no problems on the left.]))
(;B[mq]))
(;B[no]
;W[rp]
;B[ro]
;W[sq]
;B[ok]LB[so:A]TR[np][nq][or]C[This way there would be a weakness at A (so that white could try to connect in ko).
However, it's a very bad ko for white (if black wins it, black can also kill the corner group).

And white doesn't have now his stones in the marked places, so black still keeps the control over the territory on the bottom.]))
(;W[ql]
;B[pk]
;W[pl]
;B[ok]
;W[om]))
(;B[pk]))
(;W[io]LB[gm:A][iq:B]C[This is a 'dilemma' move - it might be difficult for black to decide whether to attack this stone (at A) or to take points (at B).
])
(;W[kp]C[Invasions closer to the right side might be more dangerous, because after black's defense, the white corner stops to be unconditionally alive...]
;B[no]
;W[jn]LB[lr:A]C[Besides the possibility of creating ko at T2, moves like A would be sente for black now...]))
(;W[jf]TR[ig][ch][ih][ii][hj][hk]C[I think white can simply ignore black's invasion on the left and start to get some stones in the center.

For black it will be very difficult to defend the remainings of the center, because if white gets additional stones somewhere around the triangles, the black's invasion on the left will simply be taken over by white...]
;B[be]C[And if black decides to try to make a base anyway...]
;W[og]C[White can start making a lot of inconveniences to black...]
;B[ph]
;W[pf]
;B[qf]
;W[lg]))
(;B[dj]C[In this situation (when there is no space for making a decent base on the side), I would recommend a shoulder hit instead...]
;W[dk]
;B[fj]C[It matches better with the influential previous moves.]))
(;W[dh]
;B[ic]
;W[lb]C[At any time white would be able to play this tesuji anyway.]
;B[kb]
;W[ld]))
(;W[rp]LB[ro:A]C[It's a big move for white to play here (and if black plays at A, white could play tenuki then).]))
(;B[rq]C[S3 is a very big move for black, because it's either sente, or a move with a big follow-up.]
;W[fd]
;B[qr]C[If white plays tenuki, black will be able to attack then all the white's stones in the bottom-right corner.]))
