(;
GM[1]FF[4]VW[]AP[Many Faces of Go:10.0]
SZ[19]
HA[0]
ST[0]
PB[Joey Hung]
PW[Nam ChiYun]
KM[8.0]
RE[W+3]
GC[Comments by Jie Li 7 Dan]
BR[7D]
WR[2P]

C[B: Joey Hung, 7d
W: Nam ChiYun, 2p
Comments by Jie Li 7d
Edited by Bill Cobb & Chris Garlock
Originally published in the Spring 2002 American Go Journal
This version published in the May 6, 2002 edition of the American
Go E-Journal

This game is between Nam Chiyun professional 2D, who is visiting
the US from Korea, and one of my students, Joey Hung 7D. In this
game, we will see that one move can result in a loss.
];B[pd];W[dp];B[pq];W[dc];B[fq];W[hq];B[cq];W[dq]
;B[cp];W[do];B[dr];W[er];B[cr];W[eq];B[cn];W[po];B[qo];W[qn]
;B[qp];W[pn];B[nq];W[pj]
C[Up till now, both players are playing common joseki. However,
I would prefer being Black as he has more solid territory.
];B[qh];W[nc];B[pl];W[ql];B[qk];W[pk]
;B[rl];W[qm];B[qj];W[pi];B[qi];W[ol]
C[B25 through W34 is a side joseki: Black gains territory, while
White gets thickness.
];B[ph];W[qc]
C[White 36 dives into the corner to maintain a balance in territory
];B[pc];W[qd]
;B[pe]
C[Black 39 is a thoughtless move. Black should play at R18 instead.
];W[pb];B[ob];W[qb];B[oc];W[qe];B[qf];W[rf];B[ce];W[gc]
;B[fd];W[fc];B[cc];W[cb];B[dd];W[ec];B[jc];W[pf];B[of];W[qg]
;B[oi];W[nj];B[ni];W[mi];B[mj]
C[Black 63 is a strong move, but I would choose to play at N12
here, as Black has weak points too.
];W[oj];B[nk];W[pm];B[ok]
C[Black 67 is a very crude move; he should play at 69 directly.
];W[pl]
;B[ml];W[op];B[np]
C[Black 71 is not as good as just responding at P3
];W[no];B[mo];W[mn];B[nn];W[nm];B[oo];W[mm]
;B[lj]
C[Black 79 is a bad move; he should play at O13 because that is
the shape point. Even if he lets White get this atari, the four
black stones would not die.
];W[oh];B[nh];W[og];B[ng];W[pg];B[rg];W[qf];B[rm];W[rn]
;B[sh];W[nf];B[lh];W[mf];B[lg];W[pp];B[qq];W[kn]
C[Black lost a lot in this fighting since his moyo on the upper
side is all gone.
];B[lo];W[kl]
;B[jm];W[km];B[ip];W[hp];B[io];W[jl];B[hl]
C[Black has to attack this White group to gain profit, but it is
not an easy task.
];W[jj];B[ik];W[kj]
;B[jh];W[ij];B[hj];W[ih];B[hi];W[ii];B[ig];W[hh];B[gh];W[hg]
;B[if];W[im];B[ho];W[em];B[mc];W[co]
C[White 124 is a crude move. Playing at C7 without this exchange
is preferable.
];B[bo];W[cm];B[dn];W[en]
;B[bn];W[nb];B[nd];W[oa];B[mb];W[na];B[ma];W[pa];B[md];W[oe]
;B[fo];W[eo];B[fr]
C[As White has played too defensively for the last thirty moves,
Black has really gained a lot in chasing the White group and
ends up with a big lead.
];W[gn];B[go];W[hm];B[fl];W[gm];B[dk];W[fs]
;B[gs];W[es];B[gq];W[jp];B[jq];W[jo];B[cl]
C[Black 155 is unecessary because playing at L3 will guarantee
his win.
];W[oq];B[or];W[pr]
;B[nr];W[kq];B[kp]
C[Black 161 is the losing move; it seems to me that Black suffers
an illusion here. I asked Joey during our review of the game,
and he said he played this move too fast, without thinking a
bit. This careless move costs him 50 points!
];W[iq];B[jr];W[kr];B[ko];W[jn];B[is];W[ir]
C[Now White has killed Black's group here and gained about 50 points
without any loss. Though Black tries very hard in the endgame,
he could not make up the loss, and ended up losing the game by
4 points. His one careless move ruined the game.

(The remaining moves are omitted)

Please send any comments to goking@bigfoot.com
])