(;GM[1]FF[4]SZ[19]AP[SmartGo:2.5.0.0]
GN[2011_03_xxx_anonymous-5kyus_yuanzhou]
C[Yuan Zhou Workshop Game
Anonymous 5 kyus
March 2011
Gaithersburg, MD
Anonymous 5 kyu players
Commentary by Yuan Zhou 7D
SGF file created by Bill Cobb and Chris Garlock
Published in the March 21, 2011 edition of the American Go E-Journal

Both players trade strategic and tactical errors in this game, which is thoroughly analyzed by regular E-Journal contributor Yuan Zhou 7d, one of the strongest players in the US. Yuan Zhou has won many titles; his most recent achievement was placing fifth in the Korea Prime Minister Cup--the highest finish ever for  the USA representative. Zhou is also a popular teacher, lecturer, and author. He lives in Germantown, MD, ]
;B[cp]
C[[Board rotated owing to camera angle.\]];W[dd];B[pq];W[qd]
C[Okay. So far, so good.];B[qo]
C[Fine, a traditional opening.];W[kc]
C[White sets up the Chinese opening pattern. This is fine.];B[cf];W[ch]TR[kc]
C[In the low Chinese opening with the marked stone, White does not normally pincer Black's approach stone. See the variation for Black's next move.  

Black could do this if the marked stone was high. The normal continuation for the low Chinese is White A, Black B, White C. White A works well with the marked stone.]
LB[fd:A][dj:B][pj:C]
(;B[fc]
C[This is another possibility for Black and is even more trouble for White than the 3-3 invasion.]
(;W[ee]
C[This move is a little slow. See the variation.];B[cc];W[dc]
C[This is the correct direction for White to block--White has more potential on this side.]
;B[cd];W[ce]
C[This is wrong. White can't separate Black, so White should seal Black in at A. That way White's stones are connected and form a thickness facing the open center.]
LB[dg:A];B[be];W[de]TR[ee]
C[White must connect, but now the marked stone is useless--a wasted move.]
;B[bf];W[bb]LB[eg:A]
C[White 18 is wrong. White's needs to seal Black in at A. The key thing for White in this situation is to connect his stones and form outside thickness.]
;B[cb];W[db];B[da];W[ea];B[ca];W[eb]
C[This sequence is good for Black, of course.];B[dg]TR[ch]
C[White's marked stone is cut off; the white stones are not working together.]
;W[hd]LB[gd:A][fe:B]
C[White 26 would be better at A. This leaves some aji at B. But this is not too bad.]
;B[cj]
C[This is too close. It should be at A. Black wants White to run the marked stone out. That would give Black chances to build up his bottom area and to reduce White's top area. Black 27 gives White the chance to give the marked stone up because it has become small.]
LB[dk:A]TR[ch];W[fq]
(;B[iq]LB[dq:A][kq:B][hq:C]
C[In this case, Black should take the corner at A with 29. White would extend to 29 and Black cold extend to B--good for Black. Black could play 29 at C. See the variation.]
;W[fn]LB[cq:A]
C[White should attach at A with 30. This helps Black at the top, and because Black's lower right corner is strong, White does not have a good way to attack the marked black stone.]
TR[iq];B[dn];W[kq];B[io]
C[Black 33 is correct. White is weak.];W[ko];B[im];W[np]LB[nq:A][nr:B]
C[If White is going to play here it should be at A to make a base. 36 leaves Black the slide to B.]
;B[dr]LB[dq:A][fp:B]
C[This is the right idea, but Black should make the corner solid with 37 at A. After Black A, Black can aim at B to attack White's weak group.]
;W[ip]
C[White 38 is not correct, but Black gives White a good result.];B[hp];W[jp]
;B[hn]LB[ho:A]
C[Black should connect solidly at A with 41.];W[hq]
C[This cut is good for White in this situation.];B[gq];W[hr];B[gr]LB[gp:A]
C[Oops! Black must connect at A. The situation would still be okay for Black then.]
;W[gp];B[ho]
C[This is a terrible result for Black.];W[fr];B[fo];W[pj]
C[White 50 is necessary--expand the moyo.];B[oc]LB[od:A]
C[Black 51 should be at A.]
(;W[oe]LB[pc:A]
C[No, White 52 is a big mistake. White must attack by removing Black's base. 52 should be at A. White A is almost always the right play in the Chinese opening when Black plays low this way. See the variation.
]
;B[lc]LB[qc:A]
C[Black should go to the corner first with 53 at A.];W[kd];B[ld]
C[Black is inviting White to hane at the head of two stones--not good.];W[le]
C[White 56 is correct.];B[ke]
C[Black 57 is an overplay because White is stronger here. Fighting here is good for White.]
;W[lb];B[mb];W[mc]LB[kb:A]
C[No. White must connect at A. This is a wasted stone and helps Black. White is helping Black get settled. 
]
;B[md];W[me];B[nd];W[kb]
C[White still has to connect but now there is a problem at A.]LB[ne:A];B[ne]
;W[nf]
C[White has a serious cutting point.];B[of]
C[White has made it too easy for Black.];W[od];B[nc];W[ng];B[kf]
C[This is okay.];W[lg];B[if]
C[This is wrong. Black is alive at the top right so he should attack White's weak corner at A. Black does not need to kill White in the corner, but destroying White's potential on the right side is very good for Black. Black 73 is approaching a strong white group.]
LB[qe:A];W[gf]LB[pc:A]
C[White should protect the corner, where he is thin. White A with 74 is sente. White's top group is not in danger.]
;B[fh]TR[ke:kf][if]
C[Black 75 is a mistake--giving up the marked stones (White A).]LB[hh:A]
;W[hg]LB[hh:A]
C[White 76 is slow--A is better.];B[jh]LB[hi:A][qe:B]TR[ke:kf][if]
C[Black could give up the marked stones now with 77 at A. Black's left side is bigger than White's. Also, Black has a follow-up at B.]
;W[hi];B[ih];W[hh];B[jj];W[hk];B[jl]
C[83 is a little slow. Black A is better. Whitem ust play at B, and Black jumps to C.]
LB[mh:A][mg:B][mj:C];W[di]LB[pc:A]
C[White should play at A.];B[fj]
C[Cutting off White is good.];W[dj];B[ck];W[fk];B[ej]LB[gj:A]
C[Playing on the outside with 89 at A is better--a double peep.];W[dk]LB[ek:A][fi:B]
C[White 90 should be at A, threatening the wedge at B.];B[cl];W[gj];B[ek]
(;W[el]LB[fi:A][eh:B]
C[White 94 should be at A or B. See the variation.];B[eh]
C[This is a key move. Now there are cuts at A and B.]LB[dl:A][fl:B];W[fl]
;B[dl]
C[This is a big gain for Black.];W[pc];B[pb];W[qb];B[ob]
C[Black is ahead, but White can try to catch up on the right side.];W[he]
C[White is behind. He doesn't have time for this sort of overly cautious play. White needs to play at A.]
LB[qm:A];B[rj]LB[ql:A]
C[Black A is enough to win, but this is a smart way for Black to play.];W[qj]
C[White 104 is too defensive. The best way is to attach at A. White needs to try to capture the marked black stone or to take advantage in the corner. White A is a good leaning attack.]
LB[qn:A]TR[rj];B[rk];W[ri];B[pl]LB[ql:A][qn:B]
C[Black 107 should be at A. This leaves some aji--White B.];W[ol]
C[This is helping Black. There is very little potential for White toward the center. White needs to try to make some points. White A is big. Also White could start a cross-cut at B to create complications.]
LB[oq:A][qn:B];B[pm];W[pk];B[qk]LB[nr:A];W[mj];B[li]
C[Black 113 is slow and helps White. There are better things for Black to do. The hane at A is very big. There's also a peep at B.]
LB[si:A][mh:B];W[mi];B[lh];W[kg]
C[This is wrong, but ...];B[jg]
C[... Black does not respond correctly--Black A is big. Even Black B is better.]
LB[mh:A][ie:B];W[mh];B[om]LB[nr:A]
C[Black 119 is not as big as the slide to A.];W[go];B[gn];W[fp];B[fm];W[eo]
;B[em];W[qh]
C[If White was winning, this sort of protective play would be good. But when you are losing, this is too slow. White 126 should be at A.]
LB[oq:A];B[nr]
C[This is too big for White to have any further hope.];W[mq];B[oo]LB[mr:A]
C[Pushing at A is better than 129, which is small.];W[mr];B[or];W[ki]
C[This again helps Black.];B[kh];W[ji];B[ii];W[kj];B[mf];W[jk];B[ij];W[lk]
;B[qa]
C[We can stop here. 

Black is clearly winning. At the end Black wins by 9.5 points after giving White 7.5 points in komi.]
)
(;
FG[4353:]PM[2]MN[1];W[fi];B[ei];W[eh];B[gi]LB[el:A]
C[Black 4 has to be at A so White can connect.];W[el];B[fi];W[fg]))
(;
FG[4353:]PM[2]MN[1];W[pc];B[od];W[pf]
C[The aim of the Chinese opening is to make profit by attacking Black. This is the way to do that.]
))
(;
FG[4353:]PM[2]MN[1];B[hq]
C[Black can give up the corner this way.];W[cq];B[dp];W[dq];B[ep];W[fr];B[go]
C[This is good for Black, too.]))
(;
FG[4353:]PM[2]MN[1];W[df]
C[This attachment is the normal move for White.]
(;B[dg]
C[Black should hane with 2 now--going in to the 3-3 point is a mistake in this situation.]
;W[cg];B[dc]
C[This is the proper continuation for Black. 
];W[ce];B[cc]
C[This result is the best for Black. Black wants his wall to be positioned this way.]
)
(;
FG[4353:]PM[2]MN[1];B[cc];W[dc];B[cd];W[de];B[bg];W[eh]TR[fc]
C[After this normal continuation, Black's marked stone is clearly too close to thickness. Black should avoid this.]
)))
(;
FG[4353:]PM[2]MN[1];B[cc]
C[When Black goes into the corner after the pincer, ...];W[dc]
C[... White must block on this side.];B[cd];W[de];B[bf];W[eg]
C[After this normal continuation, ...];B[jd]TR[kc]
C[... it is easy for Black to reduce White's moyo with the shoulder hit at Black 7. If the marked stone is at A, it works better with White's stones to the left.]
LB[kd:A]))

