(;SZ[19]EV[14th Samsung Cup final sixteen round]DT[2009-10-13]KM[6.5]PC[Korea]PB[Wang Yao]BR[6p]PW[Park YuongHoon]WR[9p]RE[W+0.5]C[Commentary by Won SeongJin 9p,
Copyright by gogameworld.com and weiqi.tom.com.];B[pd]C[Wang Yao 6p takes Black.];W[dp];B[qp];W[dc];B[de]
;W[ce];B[cf];W[cd];B[fq];W[cn];B[op]C[The simple jump of B11 is not often seen nowadays.];W[jp];B[lq];W[qq]LB[pq:a][qo:b]C[W14: For Black to block at 'a' is White's wish, White will happily clamp at 'b'.];B[rp]
;W[qi];B[qk];W[qf];B[qe];W[pf];B[nd];W[dr]C[W22: Park YuongHoon directly defends the lower left corner, in fact he can also reinforce the right side, but Park YuongHoon's style is always alert to territory.];B[oj];W[rk];B[rj];W[qj];B[ri];W[rh]
;B[rl];W[pk];B[ql];W[pj];B[oi]C[B33: The opening proceeds very fast due to two hours of regular time in this tournament.];W[pl];B[nl]LB[sk:a][sl:b][qm:c][pm:d][rm:e][sj:f][pn:g][om:h][qn:i][sm:j][sn:k][rg:l][qh:m][sh:n][rf:o][on:p][nk:q]C[B35: Black caps with momentum. White perhaps can initiate a capturing race at 'a', but currently its timing is not ripe, if W 'a' through B 'p', White is not good; 

White is not easy to answer and can consider to crosscut at 'q'.]
;W[nk]C[W36 is the strongest move.];B[ok];W[ol];B[nm]C[B39: Black also plays very strongly.];W[qm]LB[pm:a]C[After the hane of W40, Black is a little painful, for Black to cut at 'a' is White's wish.];B[rm];W[sk];B[rg]C[B43: Ah! Black can clamp this way? Park YuongHoon may have overlooked this move.];W[qg];B[sh]
;W[qh];B[rf];W[mk]C[The extension of W48 is momentum, White has no time to capture two black stones on the right side, if White is being sealed off by Black, the aji is not very good.];B[mi];W[nn]LB[ll:a]C[W50 is local tesuji. Next Black can only jump to 'a'.];B[ll];W[om];B[sl]C[After the block of W52, B53 is a must.];W[np];B[oo];W[rn]C[W56: The fight starts from the right side and gradually extends to the center, the situation is still unclear.]
;B[sj];W[on];B[lm];W[no]LB[nq:a][oq:b][nr:c][pq:d][pp:e][rq:f]C[W60: Wang Yao is thinking whether to crossover at 'a' or descend at 'b'? If B 'a', W 'b', through W 'f', Black is difficult to handle.];B[nq]C[The sequence following B61 is basically inevitable.];W[oq];B[pq]
;W[mq];B[or];W[nr];B[oq]C[B67: Black can only connect, Black's burden is too heavy if playing the ko.];W[mp];B[lr];W[mr];B[iq]C[B71: The big white dragon surprisingly still doesn't have one eye, this shape is very interesting.];W[lj];B[kh];W[jj]C[W74: White still elects to first escape two stones, otherwise White is hopeless at this configuration.];B[il]
;W[hj];B[gl]C[B77: Now the center gradually becomes the main battle field. So far, Black is slightly leading in territory.];W[li];B[lh];W[oe]LB[mh:a]C[W80: Black couldn't connect, since Black can cut at 'a'.

After this move, it is time for noon break.];B[mh];W[od];B[oc];W[nc];B[pc];W[md]
;B[ii];W[ji];B[jh];W[jl]LB[fj:a][jk:b]C[W90: White perhaps wants to obtain sente and jump to 'a', next for Black to wedge at 'b' is a good move.];B[jm];W[ik]C[B91: Wang Yao still elects to play simply.];B[kl];W[jk]LB[im:a][kn:b][ko:c][in:d]C[W94: Black is difficult to answer. If B 'a', White can peep at 'b'. However Black can counterattack at 'c'. Black can also hang at 'd'.]
;B[in];W[hh]LB[hg:a];B[hg];W[nb]C[W98: If White simply turns to the upper right corner, it is difficult to say that White takes advantage in the exchange of W96 and B97.];B[gh]LB[gi:a];W[hi];B[gg];W[fj];B[dm];W[dj]
;B[le];W[me];B[dn];W[ig];B[if];W[ih];B[jf]C[B111: White is very happy to capture one stone in the center.];W[co];B[bg];W[kn];B[ko];W[jo];B[jn]
;W[lo]C[W118: Black is still not very safe at bottom.];B[cm]C[B119: Black blocks strongly on the left side, asking White whether his group in the center is alive? So far, it seems Black takes initiative.];W[hp]C[W120: White also plays very strongly, this is crucial moment, the one who gives an inch will lose the game.];B[ln];W[kp];B[ho];W[gp];B[ep];W[go];B[gn];W[eo]C[W128: At bottom Black is being separated, this way if Black couldn't capture White in the middle, the game is over.]
;B[do];W[dq];B[fo];W[fp];B[en];W[eq];B[gi]C[B135: Black starts to kill.];W[gj];B[ej];W[ei];B[ek];W[fi];B[eg]LB[hl:a]C[Through B141, Black's sequence is very good, still can't see how White to make life. For White to play atari at 'a' is most complicated.]
;W[hl];B[hm];W[gk];B[di];W[im];B[cp];W[bp];B[il]C[B149: This ko to Black is worry-free, Black must seek compensation since Black already pays price at bottom.];W[ki];B[kk];W[im];B[cq];W[bq]
;B[il]C[B155: White also has many local ko threats.];W[fg];B[ff];W[im];B[eb];W[ec];B[il];W[eh];B[ci];W[im];B[fb];W[db];B[il]
;W[dg];B[ef];W[im];B[be];W[bd];B[il]LB[bb:a]C[B173: The life-and-death may turn to the upper left corner, the invasion at 'a' becomes the decisive place.];W[jg];B[kf];W[im];B[da];W[ae];B[bf]
;W[ca];B[il];W[ml];B[mm];W[im]C[W184: Now Black also doesn't know how to continue finding ko threats in the upper left corner.];B[bo];W[bn];B[il];W[ko];B[km];W[im];B[bm];W[cr]
;B[il]C[B193: Now they all have damaging ko threats left.];W[nj];B[ni];W[im];B[bb]C[B197: If this ko threat is working, next White wouldn't have any ko threats left.];W[fl]C[W198: Park YuongHoon dares not answer the ko threat.];B[fc];W[cb];B[bc];W[ab];B[ac];W[ba]
;B[aa];W[kg]C[W206: Black needs to answer this ko threat.];B[mf];W[ab];B[nf];W[ne];B[aa];W[lg];B[lf];W[ab];B[gm];W[ad];B[il]
;W[dh]C[W218: This ko threat is good, White adds several more ko threats.];B[df];W[im];B[aa];W[cc];B[il];W[mg];B[ng];W[im];B[jr]C[B227: Black still can find ko threats at bottom, White is very difficult to answer.];W[el];B[dk]
;W[eo];B[fn];W[il];B[is]LB[io:a][fr:b][hn:c][kc:d]C[B233 is a good move, Black makes life at bottom, there is another ko in the center, W 'a', B 'b', W 'c' and B 'd', if White eliminates the ko, White wouldn't have enough territory.];W[qb];B[pa];W[jc];B[fr]C[B237: If there is no loophole in the upper right corner, the invasion of W234 is very damaging. Now Black already lives cleanly at bottom, White must find a loophole in the corner.];W[rd]
;B[re];W[pb];B[ob];W[qc];B[sd];W[sc];B[ra];W[rb]C[B245: Black needs to capture this strongly? Even if White lives, Black is still favorable.];B[qa];W[qn];B[qd];W[se];B[ic]C[B251: Wang Yao still plays very strongly. There seems to have a multi-stage ko in the upper right corner.]
;W[ib];B[kc];W[hc];B[id];W[kb];B[jd];W[jb];B[lc];W[lb]C[W260: The situation is very close, the ko in the upper right corner will decide the game?];B[fk];W[am];B[al];W[an]
;B[bl];W[hd];B[he];W[ch];B[bh];W[gd];B[fd];W[ge]C[W272: The situation is still very close.];B[fh];W[po];B[qr];W[sn];B[oa]
;W[na]C[W278: If Black can't kill, White will win.];B[gb];W[hb]C[W280: Since White has more ko threats, Black is also difficult to fight the ko.];B[sf];W[sd];B[sa]C[W284: Black judges he wins?];W[pe];B[gq]C[B285: It is a pity that White didn't play here earlier.];W[hq];B[hr];W[ld]
;B[kd];W[oh];B[og];W[ph];B[nh];W[io];B[hn];W[jq];B[ls];W[gf];B[hf]C[B299: White perhaps wins by half point?];W[kq];B[kr]
;W[es];B[fs];W[ed];B[fe];W[af];B[er];W[ag];B[ah];W[ds];B[mc];W[mb];B[qo];W[pn]
;B[pp];W[sp];B[sq];W[so];B[ep];W[ip];B[ir];W[eo];B[ha];W[ia];B[ep];W[cj];B[bi]
;W[eo];B[ea];W[ga];B[ep];W[rq];B[rr]C[B233: By Chinese rules, the several eyes on the right side will be counted as points.];W[eo];B[os];W[mn];B[ep];W[gs];B[gr];W[eo]
;B[mj];W[lk];B[ep];W[dl];B[ck];W[eo];B[cp];W[cq];B[ep];W[cl];B[bj];W[eo];B[ao]
;W[cp];B[ep];W[lp];B[eo]C[B357: Wang Yao perhaps makes mistake in the rules? thinking the cutting eyes on the right are points. This is a very difficult game, Park YuongHoon finally wins by half point.];W[ab];B[si];W[ha];B[sg]C[Overall: In the opening, the fight starts on the right side and finally extends to the second half of the game. In terms of tempo, Black clearly takes initiative, but Park YuongHoon wins by his deliciousness; With B215 Black should play at bottom, however B233 is a good move, the situation becomes chaotic. The following variations are complicated, the last questionable moves are B281 and B283, if Black wouldn't make compromise, what would be the result?

Park YuongHoon finally wins by half point and advances to the quarter final.])