(;
ST[2]
RU[Japanese]
KM[6.50]
TM[3600]
OT[3x30 byo-yomi]
PW[Albert Yen]
PB[Anibal Gomez de la Fuente]
WR[7d]
BR[1d]
DT[2019-06-02]
EV[WAGC]
RO[1]
WT[USA]
BT[Argentina]
RE[W+Resign]
C[World Amateur Go Championship
White: Albert Yen, 7D
Black: Anibal Gomez de la Fuente, 1D
June 2, 2019, in Matsue, Shimane Prefecture, Japan
Comments by Albert Yen, 7D
Game editors:  Kiren Polara, Myron Souris

Albert Yen's commentary is from his 1st round win against Argentina's Anibal Gomez de la Fuente.  Although the game is effectively over by move 60, Albert covers instructive mistakes by both sides.  For the game moves, Albert also includes LeelaZero's (AI) winrates.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.  To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.];
B[cp]
C[46.6% (0.2%)
1.0k playouts

Note:  LeelaZero's winrate percentage above is the winning estimation for the player who just moved.  The parenthesized percentage is how much the winning estimation increased (or decreased) as a result of the given move.  The playout count (in this case 1000) indicates the number of Monte Carlo runs in the game tree search - very roughly speaking, the more playouts the better the estimation.

Be warned that the winrates in this game may not be completely accurate, because WAGC uses Japanese rules, which has a 6.5 point komi rather than LeelaZero's 7.5 point komi.  In a normal game this would barely make a difference, but because the margin of lead in this game is very small throughout one point can make a big impact.  In other words, Black's position is always better than what the winrate indicates.];
W[pd]
C[53.6% (0.2%)
1.0k playouts];
B[dd]
C[46.6% (0.2%)
1.0k playouts];
W[pq]
C[53.6% (0.2%)
1.0k playouts];
B[fp]
C[46.8% (0.3%)
1.0k playouts];
W[qn]
C[53.2% (-0.0%)
1.0k playouts];
B[nc]
C[46.9% (0.1%)
1.0k playouts];
W[qf]
C[52.8% (-0.3%)
1.0k playouts];
B[jd]
C[45.9% (-1.2%)
1.0k playouts];
W[cc]
C[54.2% (0.1%)
1.0k playouts];
B[dc]
C[45.9% (0.1%)
1.0k playouts];
W[cd]
C[54.1% (-0.0%)
1.0k playouts];
B[ce]
LB[cf:A]
C[45.7% (-0.2%)
1.0k playouts

In this age of AI most people will play at A.];
W[be]
C[54.3% (-0.0%)
1.1k playouts];
B[cf]
C[46.2% (0.5%)
1.0k playouts];
W[bf]
C[53.8% (0.0%)
1.1k playouts];
B[cg]
C[46.2% (0.0%)
1.1k playouts];
W[bg]
C[54.0% (0.2%)
1.0k playouts];
B[ch]
C[46.1% (0.1%)
1.0k playouts];
W[lc]
C[54.3% (0.4%)
1.0k playouts];
B[ld]
C[46.1% (0.5%)
1.0k playouts];
W[kd]
C[53.9% (0.1%)
1.0k playouts];
B[ke]
C[46.7% (0.6%)
1.0k playouts];
W[kc]
C[53.3% (0.0%)
1.1k playouts]
(;
B[jc]
LB[md:A]
C[40.4% (-6.3%)
1.0k playouts

This is a mistake.  A is correct.];
W[md]
C[59.7% (0.0%)
1.1k playouts];
B[le]
C[40.3% (0.0%)
1.1k playouts];
W[mc]
C[59.6% (-0.0%)
1.2k playouts]
(;
B[me]
C[30.1% (-10.2%)
1.0k playouts

Big mistake.];
W[nd]
C[69.9% (-0.0%)
1.0k playouts];
B[kq]
C[17.4% (-12.7%)
1.0k playouts];
W[je]
C[82.6% (0.0%)
1.1k playouts];
B[hd]
C[18.3% (0.9%)
1.0k playouts]
(;
W[jf]
LB[kq:A]
C[81.8% (0.1%)
1.0k playouts

I extended here because I thought the other extension may not be sente.  I picked the safer move because I thought the game was very good for White.

According to LeelaZero White has a 81% winrate right now, mostly because of A.];
B[lh]
C[18.2% (0.0%)
1.0k playouts];
W[jh]
C[81.5% (-0.3%)
1.0k playouts];
B[ki]
C[18.3% (-0.2%)
1.0k playouts]
(;
W[ji]
C[80.2% (-1.5%)
1.0k playouts];
B[kj]
C[18.0% (-1.7%)
1.0k playouts];
W[jj]
C[81.1% (-0.9%)
1.0k playouts]
(;
B[kk]
C[16.9% (-2.0%)
1.0k playouts

This move is a bit slack.  Black complicates the game more with the hane.];
W[il]
C[83.4% (0.3%)
1.0k playouts

With this White is comfortably ahead as black has no real territory.];
B[hj]
C[15.2% (-1.4%)
1.0k playouts]
(;
W[ij]
LB[he:A]
C[81.2% (-3.6%)
1.0k playouts

However, this is also a slack move.  I should've taken this opportunity to get sente here and play at A.]
(;
B[pj]
LB[pg:A]
C[18.8% (-0.0%)
1.0k playouts

This move was a bit slow.  Black can use the corner's aji to play at A.];
W[eq]
LB[hk:B][jm:A]
C[79.7% (-1.5%)
1.0k playouts

Defending at A or B is sufficient for White, but in the game I wanted to take more points from Black.];
B[ep]
C[20.2% (-0.1%)
1.0k playouts];
W[cq]
C[80.4% (0.6%)
1.0k playouts];
B[dp]
C[20.0% (0.4%)
1.0k playouts];
W[dq]
C[79.9% (-0.2%)
1.0k playouts];
B[fq]
C[20.3% (0.1%)
1.0k playouts];
W[bp]
C[80.4% (0.7%)
1.0k playouts];
B[bo]
C[19.6% (-0.0%)
1.1k playouts];
W[bq]
C[80.5% (0.1%)
1.1k playouts];
B[er]
C[20.0% (0.5%)
1.0k playouts];
W[dr]
C[80.4% (0.3%)
1.0k playouts];
B[fr]
C[18.7% (-1.0%)
1.0k playouts];
W[bn]
C[81.7% (0.4%)
1.0k playouts];
B[ao]
C[16.8% (-1.6%)
1.0k playouts

This was the last critical mistake.  White takes sente here as A4 is sente for White.  After move 60 Black is shut out of the game because White is far ahead in territory.]
(;
W[hk]
LB[jc:A][je:D][me:B][kq:C]
C[84.1% (0.8%)
1.0k playouts

White is clearly ahead on the board and Black had no chance after this move. 

The game was decided by moves A, B, and C.  Black first played from the wrong direction with A and gave away too many points at B.  C allowed White to cut at D and erase black's moyo.];
B[db]
C[16.4% (0.4%)
1.0k playouts];
W[bh]
C[83.2% (-0.5%)
1.0k playouts];
B[ci]
C[16.2% (-0.6%)
1.0k playouts];
W[cb]
C[82.8% (-1.0%)
1.0k playouts];
B[nq]
C[17.7% (0.5%)
1.0k playouts];
W[po]
C[81.9% (-0.4%)
1.0k playouts];
B[pr]
C[17.7% (-0.4%)
1.0k playouts];
W[or]
C[82.8% (0.6%)
1.0k playouts];
B[oq]
C[17.1% (-0.0%)
1.0k playouts];
W[qr]
C[83.0% (0.1%)
1.0k playouts];
B[pp]
C[16.8% (-0.1%)
1.0k playouts];
W[qq]
C[83.1% (-0.1%)
1.1k playouts];
B[op]
C[13.4% (-3.5%)
1.0k playouts];
W[qp]
C[86.6% (0.1%)
1.1k playouts];
B[nr]
C[12.3% (-1.1%)
1.0k playouts];
W[he]
C[88.8% (1.0%)
1.0k playouts];
B[gd]
C[11.8% (0.6%)
1.0k playouts];
W[ph]
C[86.6% (-1.6%)
1.0k playouts];
B[ni]
C[11.4% (-2.0%)
1.0k playouts];
W[gj]
C[88.0% (-0.6%)
1.0k playouts];
B[jn]
C[9.0% (-3.1%)
1.0k playouts];
W[hn]
C[88.6% (-2.4%)
1.0k playouts];
B[cn]
C[7.9% (-3.5%)
1.0k playouts];
W[bs]
C[92.2% (0.1%)
1.0k playouts];
B[ho]
C[4.1% (-3.7%)
1.0k playouts];
W[go]
C[94.5% (-1.4%)
1.0k playouts];
B[hp]
C[3.1% (-2.4%)
1.0k playouts];
W[in]
C[96.8% (-0.1%)
1.0k playouts];
B[jo]
C[2.3% (-0.9%)
1.0k playouts];
W[nn]
C[96.3% (-1.4%)
1.0k playouts];
B[pc]
C[2.3% (-1.4%)
1.0k playouts];
W[oc]
C[97.7% (0.0%)
1.0k playouts];
B[qd]
C[2.4% (0.1%)
1.0k playouts];
W[qe]
C[97.7% (0.1%)
1.0k playouts];
B[qh]
C[0.9% (-1.4%)
1.0k playouts];
W[qg]
C[98.6% (-0.5%)
1.0k playouts];
B[qi]
C[1.4% (-0.1%)
1.0k playouts];
W[ng]
C[97.6% (-1.0%)
1.0k playouts];
B[mg]
C[1.7% (-0.7%)
1.0k playouts];
W[nh]
C[98.1% (-0.2%)
1.0k playouts];
B[mh]
C[1.3% (-0.6%)
1.0k playouts];
W[jb]
C[98.1% (-0.6%)
1.0k playouts];
B[ib]
C[2.0% (0.0%)
1.0k playouts];
W[kb]
C[97.1% (-0.9%)
1.0k playouts];
B[qc]
C[2.6% (-0.3%)
1.0k playouts];
W[re]
C[96.6% (-0.8%)
1.0k playouts];
B[pe]
C[2.2% (-1.2%)
1.0k playouts];
W[od]
LB[id:B][gg:A]
C[97.9% (0.1%)
1.0k playouts];
B[id]
C[1.5% (-0.6%)
1.0k playouts

Slack move.  This is not the biggest endgame.];
W[qk]
C[98.4% (-0.0%)
1.0k playouts];
B[pk]
C[1.5% (-0.0%)
1.0k playouts];
W[ql]
C[98.4% (-0.0%)
1.0k playouts];
B[om]
C[1.2% (-0.4%)
1.0k playouts];
W[nm]
C[98.6% (-0.2%)
1.0k playouts];
B[nl]
C[1.2% (-0.2%)
1.0k playouts];
W[ml]
C[98.4% (-0.4%)
1.0k playouts];
B[mk]
C[1.0% (-0.5%)
1.0k playouts];
W[ol]
C[99.0% (0.0%)
1.0k playouts];
B[nk]
C[1.0% (0.0%)
1.0k playouts];
W[ps]
C[98.7% (-0.3%)
1.0k playouts];
B[gg]
C[0.9% (-0.4%)
1.0k playouts];
W[hh]
C[99.1% (0.0%)
1.0k playouts];
B[gh]
C[0.6% (-0.3%)
1.0k playouts];
W[gi]
C[99.3% (-0.0%)
1.0k playouts];
B[hg]
C[0.5% (-0.1%)
1.0k playouts];
W[ig]
C[99.4% (-0.0%)
1.0k playouts];
B[bi]
C[0.6% (0.0%)
1.0k playouts];
W[da]
C[99.2% (-0.2%)
1.0k playouts];
B[ea]
C[0.7% (-0.1%)
1.0k playouts];
W[ca]
C[99.3% (0.0%)
1.1k playouts];
B[gb]
C[0.7% (0.0%)
1.0k playouts];
W[hf]
C[99.2% (-0.2%)
1.0k playouts];
B[nf]
C[0.5% (-0.3%)
1.0k playouts];
W[of]
C[99.5% (0.0%)
1.0k playouts];
B[og]
C[0.6% (0.1%)
1.0k playouts];
W[oh]
C[99.4% (0.1%)
1.0k playouts];
B[oe]
C[0.6% (0.0%)
1.0k playouts];
W[ne]
C[99.5% (0.1%)
1.0k playouts];
B[mf]
C[0.4% (-0.1%)
1.0k playouts];
W[pg]
C[99.6% (0.0%)
1.0k playouts];
B[ej]
C[0.3% (-0.1%)
1.0k playouts];
W[el]
C[99.7% (-0.0%)
1.0k playouts];
B[dl]
C[0.3% (-0.0%)
1.0k playouts];
W[dm]
C[99.7% (-0.1%)
1.0k playouts];
B[dk]
C[0.3% (-0.0%)
1.0k playouts];
W[cm]
C[99.7% (-0.0%)
1.0k playouts];
B[fn]
C[0.2% (-0.1%)
1.0k playouts];
W[dn]
C[99.7% (-0.1%)
1.0k playouts];
B[co]
C[0.3% (-0.0%)
1.0k playouts];
W[fm]
C[99.7% (-0.0%)
1.0k playouts];
B[gn]
C[0.3% (-0.0%)
1.0k playouts];
W[eb]
C[99.5% (-0.2%)
1.0k playouts];
B[fa]
C[0.3% (-0.2%)
1.0k playouts];
W[ff]
C[99.5% (-0.1%)
1.0k playouts];
B[gm]
C[0.3% (-0.2%)
1.0k playouts];
W[gl]
C[99.7% (0.0%)
1.0k playouts];
B[en]
C[0.3% (0.1%)
1.0k playouts];
W[em]
C[99.7% (0.0%)
1.0k playouts];
B[hm]
C[0.3% (0.0%)
1.0k playouts];
W[eh]
C[99.5% (-0.2%)
1.0k playouts];
B[fe]
C[0.4% (-0.1%)
1.0k playouts];
W[ee]
C[99.4% (-0.1%)
1.0k playouts];
B[ed]
C[0.5% (-0.1%)
1.0k playouts];
W[ge]
C[99.4% (-0.1%)
1.0k playouts];
B[fd]
C[0.5% (-0.1%)
1.0k playouts];
W[ef]
C[99.4% (-0.1%)
1.0k playouts];
B[bl]
C[0.4% (-0.2%)
1.0k playouts];
W[bm]
C[99.5% (-0.1%)
1.0k playouts];
B[de]
C[0.4% (-0.1%)
1.0k playouts];
W[mp]
C[99.4% (-0.1%)
45k playouts

Black resigns.]
)
    (;
    W[ap];B[cn]
    C[With this sente there's no way for Black to kill white.];
    W[hk]
    (;
    B[br];W[ar];B[bs];W[cs]
    C[White lives.]
    )
        (;
        B[ar];W[br];B[cs];W[ds];B[bs]
        C[The most Black can do is a seki.]
        )
    )
    (;
    AE[bn][ao]
    AB[ap]
    LB[ap:1]
    C[Without the exchanges this is a classic dead shape.  Black 1 kills the corner.]
    )
)
    (;
    B[hf]
    C[This move not only increases Black's territory on the top but also reduces White's eye space in the middle.]
    )
)
    (;
    W[jk];B[kl];W[he];B[gd]
    LB[gk:A][in:B]
    C[A and B are both possible here.]
    (;
    W[gk]
    )
        (;
        W[in]
        )
    )
)
    (;
    B[jk];W[ik];B[il];W[hk];B[hl];W[gk];B[gl];W[fk];B[fl];W[ek];B[oo]
    C[Black can develop the bottom.]
    )
)
    (;
    W[he];B[gd];W[ij]
    C[White should make the exchange and jump out.  The game move was too heavy.]
    )
    (;
    W[ij]
    C[This is the correct shape];
    B[ji]
    C[this is not very severe.];
    W[ii];B[ih];W[hh];B[ig];W[he];B[hg];W[gd];B[hc];W[gf];B[gg];W[gc]
    C[White can escape.]
    )
)
    (;
    W[ie];B[jg];W[id];B[ic];W[hc];B[hb];W[gc];B[gb];W[fc];B[fb];W[ge];B[gg]
    C[This is more complicated for White than the game.]
    )
)
    (;
    B[je];W[nd]
    C[This is the correct sequence.];
    B[kq]
    )
)
    (;
    B[md];W[jc];B[id];W[hc];B[hd];W[gc];B[gd];W[fd];B[fc];W[fb];B[ec];W[ic]
    C[This is roughly an even result.]
    )
)

