(;
GM[1]FF[4]VW[]AP[Many Faces of Go:11.0]
SZ[19]
HA[0]
ST[0]
PB[Alexander Dinerchtein]
PW[Cho Chikun]
DT[2006-04-08]
PC[Japan, Nihon Kiin]
KM[6.5]
RE[W+14.5]
AN[Cho Hanseung, Ko Geuntae, Alexander Dinerchtein]
EV[19th Fujitsu World Go Championship]
CP["Goama", International Go Newsletter]
BR[1p]
WR[9p]
RO[1st round];B[pd]
C[This is the game I played as Black during the 19th Fujitsu World \
Go Championship. My opponent is Cho Chikun, 9-dan, one of the \
strongest Japanese masters]
;W[cq]
C[Nowadays Cho Chikun, 9-dan is the only player, using san-san \
regularly]
;B[qp];W[oq];B[dd];W[qf];B[nc]
(;W[qm]
C[White can also think about an extension at X -]
MA[ql]
;B[po];W[pj];B[pq]
C[The most solid answer. Black can also try the pincer at A or \
B, but I was trying to keep the game as simple as possible]
LB[kq:A][lq:B]
;W[op];B[pr]
C[An urgent place]

(;W[kq]
C[White can sacrifice these stones as well, by playing the kakari \
at X -]
MA[cf]
;B[ck];W[fc]
(;B[cf]
C[This move is little bit passive -]
;W[db]
(;B[cc]
C[Another solid answer -]
;W[ic];B[kc]
C[Iken tobi at X is probably better here]
MA[rd]
;W[qd];B[qc];W[rc]
C[A good move, defending the weakness at X]
MA[qh]
;B[pc];W[re]
(;B[hb]
C[A tesuji, which was recently invented in Korea -]

(;W[ib]
C[White has a choice -]
;B[ec]
(;W[mc]
C[The plan is interesting. Cho Chikun, 9-dan spend 45 minutes to \
read it -]
;B[mb];W[lb];B[lc];W[md];B[kb];W[eb];B[gc]
(;W[fd]
C[A brave move -]
;B[gd];W[gb];B[ga]
(;W[fb]
C[White can also think about the ko fight -]
;B[hc];W[ge];B[he]
C[The correct shape]
;W[hf];B[ie];W[ff]
C[According to Cho Hanseung, 9-dan, it is better to push at X first]
MA[if]

(;B[jf]
C[The wrong decision. I was trying to keep the attack for future, \
but it is not easy for Black to start it -]
;W[nb];B[la];W[nd]
C[Atari is painful for Black]

(;B[pf]
C[An overplay -]
;W[oc];B[pe]
C[It is probably better to extend at X]
MA[pg]
;W[qg]
(;B[pg]
C[The only move -]
;W[ke]
C[A clever probe]
;B[mf]
C[Another overplay. Black can only defend at X]
MA[je]
;W[nf];B[ng];W[mg]
C[I missed this tesuji]
;B[lg];W[jd]
C[Now Black is in trouble]

(;B[mh]
C[The only move -]
;W[kf];B[jg];W[me];B[kg]
C[Too slow. It is better to peep at X first]
MA[gg]

(;W[qh]
C[The most solid answer -]

(;B[cb]
C[Black can save the marked group, but ...]
TR[lc][kc][kb][mb][la]
;W[ja]
C[A nice tesuji!]
;B[ha];W[fh];B[di]
C[Black is behind on territory, so it is better to play actively \
at X]
MA[fj]
;W[dg];B[cg];W[dh];B[ch]
;W[ei]
C[White's group is almost alive. Now he has a clear lead on territory]
;B[pb];W[na];B[iq];W[or];B[er];W[dp];B[fq];W[cm]
C[It is probably better to extend at X, avoiding the invasion]
MA[cn]
;B[dj]
(;W[hg]
C[The most solid answer -]
;B[co]
C[This is the last chance]

(;W[fp]
C[The best answer -]
;B[kr];W[jr];B[jq];W[lr];B[kp];W[lq];B[ir];W[gq]
;B[gr];W[eq];B[fr];W[dn];B[cr];W[br];B[dr]
(;W[do]
C[An urgent move -]
;B[bl];W[bm];B[js];W[lp];B[lf];W[kd];B[rn];W[rm]
;B[qn];W[pm];B[sm];W[sl];B[sn];W[rk]
C[Now White is 5-7 points ahead. I decided to play extra-aggressively, \
but made the difference even bigger. This is the last note.]
;B[gi];W[ej];B[gk];W[ek]
;B[oo];W[no];B[mm];W[ps];B[qs];W[os];B[qr];W[ko];B[km];W[ih]
;B[mo];W[nn];B[lo];W[jp];B[mp];W[ij];B[ik];W[jj];B[fo];W[go]
;B[bq];W[bp];B[dq];W[cp];B[ep];W[gp];B[gn];W[hn];B[hm];W[fn]
;B[gm];W[io];B[bs];W[im];B[il];W[jm];B[kk];W[hj];B[kj];W[kn]
;B[kl];W[rb];B[gj];W[fm];B[gh];W[gg];B[hk];W[mk];B[ml];W[oh]
;B[ph];W[oi];B[pi];W[qj];B[ne];W[oe];B[od];W[ob];B[of];W[ne]
;B[og];W[ka];B[qi];W[ri];B[oj];W[nj];B[ok];W[ol];B[pk];W[qk]
;B[ni];W[nk];B[nh];W[oi];B[oh];W[pl];B[ji];W[jh];B[oi];W[nl]
;B[ki];W[kh];B[lh];W[hh];B[gl];W[dk];B[ar];W[cl];B[bj];W[de]
;B[df];W[ee];B[ce];W[ef];B[ls];W[ms];B[mq];W[mr];B[al];W[ca]
;B[ba];W[da];B[eo];W[bb];B[ab];W[aa];B[qe];W[rd];B[ba];W[en]
;B[eq];W[aa];B[rh];W[rg];B[ba];W[am];B[ci];W[aa];B[rf];W[sh]
;B[ba];W[mj];B[li];W[aa];B[sg];W[sf];B[ba];W[ln];B[mn];W[aa]
;B[id];W[jc];B[ba];W[lm];B[ll];W[aa];B[je];W[ld];B[ba];W[ip]
;B[hq];W[aa];B[le];W[jb];B[ba];W[bk];B[ak];W[aa];B[hp];W[ho]
;B[ba];W[aj];B[ai];W[aa];B[eg];W[bd];B[cd];W[eh];B[bc];W[ac]
;B[fl];W[el];B[be];W[ks];B[jr];W[ap];B[qa];W[ra];B[nq];W[nr]
;B[aq];W[fa];B[ls];W[ba];B[ad];W[ab];B[ks])
(;W[ks];B[do];W[eo];B[cp];W[dq];B[bq]
C[White would be in trouble]
))
(;W[do];B[cn];W[dm];B[dn];W[en];B[bm];W[bl];B[bo];W[am]
;B[an];W[bn];B[ee];W[fe];B[bm]
C[The ko fight would be risky for White]
))
(;W[dr];B[hg]
C[White was afraid of this attack ( the block at X is sente against \
the marked group )]
TR[kf][ke][jd][ic][ib][ja][me][md][mc][nd][nf][oc][nb][na]
MA[if]
))
(;B[ja];W[ia]
(;B[jb];W[ha]
C[... the result would be comfortable for White]
)
(;B[ha];W[id];B[hd];W[je];B[if];W[jb];B[hg]
C[This is probably the best way for Black (suggested by Cho Hanseung, \
8-dan)]
))
(;B[dp];W[dq];B[ep];W[bo];B[ia];W[ja];B[jb];W[ha];B[cp]
;W[bp];B[ia];W[fa]
C[It is not easy for Black to win this ko]
))
(;W[cb];B[qi];W[pi];B[qj];W[qk];B[rk]
C[This was my plan]
))
(;B[ld];W[me];B[mh];W[le]
C[Black cannot fight like this]
)
(;B[le];W[kf]
(;B[ld];W[jg]
C[The trade would be favorable for White]
)
(;B[jg];W[kg];B[jh];W[mh]
C[The adji would be really bad]
)))
(;B[mf];W[nf];B[ng];W[mg];B[lf];W[og];B[ne];W[nh];B[me]
;W[cb]
C[The result would be promising for White]
))
(;B[oc];W[pe]
C[It seems, that Black has no other way]
))
(;B[if];W[hg];B[ig];W[hh];B[ee];W[fe];B[di];W[nb];B[la]
;W[nd];B[oc];W[pe];B[co]
C[This is the proper way. The opening would be equal]
))
(;W[fa];B[fb];W[nb];B[la];W[gb];B[dp];W[ha];B[cp];W[dq]
;B[eq];W[er];B[fq];W[fr];B[gq];W[bp];B[bo];W[bq];B[cn]
C[The trade would be equal]
))
(;W[gd];B[fd];W[fb];B[hd];W[hc];B[ge];W[gb];B[pe];W[pf]
;B[do]
C[The opening would be promising for Black]
))
(;W[eb];B[gc];W[gd];B[fd];W[fb];B[hd];W[hc];B[ge];W[gb]
;B[do];W[ep];B[eo];W[fp];B[cp];W[bq];B[fo];W[gp];B[hn]
C[White can connect the stones, but the moyo would be really deep]
)
(;W[fb];B[hc];W[hd];B[id];W[gc];B[he];W[gd];B[jc];W[ie]
;B[jd];W[jb];B[kb];W[ha];B[ja];W[gb];B[hf]
C[The result would be terrible for White]
)
(;W[fd];B[eb];W[ie]
C[This is the standard way to defend, but the corner would be large]
))
(;W[ed];B[hc];W[de];B[ce];W[dc];B[cd];W[hd];B[ib];W[gc]
C[This is the most simple way to defend]
)
(;W[hc];B[ib];W[gb];B[jc]
C[The peep at X would be painful for White]
MA[gd]
))
(;B[gc]
(;W[gb];B[fb];W[gd];B[ec];W[hc];B[eb]
C[This is the old way to attack the group. The result considered \
to be slightly favorable for White, because of sente]
)
(;W[hc];B[ec];W[eb];B[fd];W[fb];B[gd];W[gb];B[jb]
C[It is usually bad for White to connect like this]
)))
(;B[gc];W[gb];B[fb];W[hc];B[gd];W[eb];B[hb];W[fa]
C[It is not easy for Black to use the attachment (my favorite move) \
because the ladder is unfavorable]
))
(;B[eb];W[ic];B[kc];W[fb];B[ec];W[fe];B[cf]
C[According to Ko Geuntae, 5-dan this plan is slightly better]
))
(;W[cf];B[fc];W[dj];B[kp];W[iq];B[mp];W[ep]
C[The opening would be well-balanced]
))
(;W[ql]
(;B[po];W[pi];B[pq];W[op];B[pr];W[kq]
C[We can often see this pattern in Cho Hunhyun's games]
)
(;B[pq];W[op];B[qn];W[om]
C[This is another possibility, which is recently popular in Korea]
)))
