(;
GM[1]FF[4]VW[]AP[Many Faces of Go:10.0]
SZ[19]
HA[0]
ST[0]
PB[Joey Hung ]
PW[Yuan Zhou ]
DT[2002-08-07]
PC[US Go Congress, Chicago, IL]
KM[8.0]
TM[90 min + 5 of 1 min]
RU[Ing]
RE[B+11]
AN[Comments are by Yuan Zhou]
US[Yuan Zhou created this SGF]
EV[Ing Cup 2002]
GN[N.A. ING CUP ROUND 4]
CP[American Go Association]
GC[With Ing komi, Black wins ties]
BR[7 dan]
WR[7 dan]
RO[Round 4]

C[Ing Cup 2002
Round 4
US Go Congress, Chicago, IL
w: Yuan Zhou, 7D
B: Joey Hung, 7D

Commentary by Yuan Zhou; published in the 12/2/02 edition of
the American Go E-Journal

Edited by Bill Cobb & Chris Garlock
]goWriteVersion[1.4p,Unregistered version]goWriteeXtension[DefPic=001];B[fq]
C[This game is for third place in the 2002 North American Ing Cup.
Black starts with a interesting move.
];W[dp];B[cn];W[eo];B[cq];W[pp];B[pd];W[dd]
;B[dq];W[nc];B[qf];W[pb];B[cf];W[fc];B[qc];W[ld];B[dj];W[df]
;B[dg];W[ef];B[cd];W[ce];B[be];W[de];B[bg];W[cc];B[bd];W[eg]
;B[dh];W[fi]
C[W30 is a important move. It expands White's top framework and
reduces Black's framework on the left side at the same time.
];B[jc]
C[B31 is a very aggressive move, trying to destroy all of the White's
top framework. The normal move should be around K15.
];W[kc];B[jd];W[kf]
C[W34 is a severe attack by White. Black is in a very dangerous
and difficult position. Black has to save the two stones, but
White doesn't need to kill them to gain the lead.
];B[gc];W[gb];B[jf];W[jg]
;B[kb];W[lb];B[ig];W[jh];B[ke];W[le];B[gg];W[if];B[hf];W[je]
;B[ie];W[jf];B[ge];W[hh];B[hc];W[fb];B[fd];W[id];B[hd]
C[At B57, Black's group has to live by winning the ko. White has
already gained thickness in center and will have two extra moves
from the ko fight. Therefore White is ahead in the game.
];W[he]
;B[eh];W[fh];B[ie];W[qg];B[ic];W[pf];B[qe];W[pg];B[qb];W[pm]
C[At W68, we can see that although Black has detroyed White's framework
at the top, White's right to center framework is even bigger.
]
;B[jp];W[oq];B[mq];W[jn]
C[At W72, Black has to do something about White's right to center
framework, if it becomes territory, White is winning for sure.
];B[qk];W[qm];B[qi];W[rj]
C[W76 means W has decided to kill both B73 (at R9) and B75 (at
R11). But it makes the game complicated and unnecessarily risky
for White. Now Black will run into the center, and if Black survives,
Black can destroy White's right and center territory. White should
play Q10 to seal Black in on the right side. That way even Black
lives on the right side, White will still have the center as
territory and keep the lead.
];B[ri];W[rg]
;B[rm];W[rn];B[oj];W[rk];B[qj];W[ql];B[ol];W[nk];B[ok];W[nl]
;B[nj];W[om];B[lj];W[kk]
C[At W92, White has sealed Black in, so now the question is can
Black live?
];B[ng];W[oh];B[nh];W[oe];B[lk];W[ll]
;B[kj];W[jk];B[jj];W[ij];B[ii];W[ik];B[ji];W[hi];B[ih];W[hg]
;B[kh]
C[B109 is a very good move and it is the critical move for Black
to live.
];W[lg];B[mf];W[lf];B[od];W[ne];B[mk];W[ml];B[lh];W[mi]
;B[mg]
C[At B119, Black has saved the group and now is taking the lead
on the board with more territory. White now has to use his center
thickness to get the game back.
];W[gq]
C[White strikes with W120, intending to attack B69 (at K4) and
B71 (at N3), and at the same time destroy Black's bottom territory.
];B[gp]
C[White is happy with B121, since Black is fighting directly with
W120 (at G3). White's thickness in center will be a big help.
];W[hp];B[hq];W[iq];B[gr];W[hr];B[ip];W[gq]
C[At W128, Black can't win this ko fight, because White has lots
of ko threats against Black's center group and Black simply can't
find good ko threats.
]
;B[ho]
C[Therefore Black has to give up the ko by playing B129 at H5.
];W[hq];B[jq];W[fr];B[fp];W[jr];B[in];W[go]
C[At W136, because of White's thickness in center, White is in
a better positon to fight than Black is. The game now becomes
very complicated again, and the outcome of this game will be
decided here.
];B[gn];W[fo]
;B[er];W[gs];B[eq];W[kq]
C[At W142 we can see that White has cut off Black's stone at N3
and made huge profits at the bottom.
];B[kp];W[lp];B[lq];W[kr];B[lo];W[mp]
;B[mo];W[np];B[jm];W[fm]
C[W152 is a mistake and it is the losing move. White should play
at E7 to save the four white stones in the lower left. White
thought that giving up the four stones and taking some profit
in the center could still win the game, but that was not the
case.
];B[fn];W[en];B[em];W[gm];B[hn];W[kn]
;B[km];W[el];B[dm];W[ln];B[im];W[io];B[lm];W[mn];B[jo];W[ko]
;B[nd]
C[B169 is a very big move, it squeezes White's big group and takes
profit at the same time.
];W[me];B[mc];W[mb];B[nb];W[jb];B[ib];W[ka];B[ma];W[kd]
;B[ia];W[ja];B[ed];W[ec];B[bb]
C[B183 is also a very big and nice move. It threatens to cut off
White's group at F13 and makes White's center thickness become
thin.
];W[fg];B[cb];W[se];B[rd];W[la]
;B[md];W[lc];B[ob];W[oa]
C[W192 is also a mistake, it is too small at this point.
];B[db];W[dc];B[hl];W[io]
C[W196, capturing Black's five stones becomes the final losing
move for White. White should play around G9 to save White's three
stones in the center, which is simply bigger than capuring Black's
five stones.
];B[gk]
C[After B197, White has lost the game.

Remaining moves, omitted.
])
