(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]SZ[19]KM[6.50]TM[1800]OT[5x30 byo-yomi]DT[2013-01-12]PC[The KGS Go Server at http://www.gokgs.com/];B[dp];W[pd];B[cd];W[pq];B[ec];W[fq];B[dn];W[jc];B[po];W[pl];B[mp];W[oo];B[on];W[no];B[pp];W[nq];B[qq](;W[pr]C[joseki too](;B[nn]C[black first mistake];W[mo];B[qn](;W[cj]C[this is not an urging move (white mistake)](;B[ch]C[black should attack from other side];W[bn](;B[go]LB[ip:A];W[hp]C[exchange 25 to 26 is very good for white !];B[qc]C[approach is better when you can];W[pc];B[qd];W[qe];B[re](;W[qf]C[not interesting joseki for white in this game];B[rf];W[qg];B[pb];W[ob];B[qb];W[nc]TR[jc]C[marked stone is not well placed];B[ei]C[black should kosumi first to keep white on the second line];W[ek]C[white mistake. He should fix his form. Where should black play to punish white ?](;B[cl]C[black mistake];W[cm](;B[dl];W[dm](;B[el]C[big trouble for black !];W[em];B[fl];W[bl]C[it will be very difficult for black to save both groups])(;B[em];W[bl];B[el];W[ck]C[there's still a cutting point]))(;B[dm];W[bl];B[dl];W[ck];B[dk]C[better wall than the next variation]))(;B[cm];W[bm];B[cl];W[bl];B[ck];W[bk];B[dj];W[ci];B[bh]))(;W[rf];B[qf];W[pe];B[rg];W[pf];B[sf];W[qg];B[rf];W[qh](;B[pb];W[ob];B[qb];W[cl]C[white can play elsewhere])(;B[]C[if black tenuki];W[pb]C[white is sente and has a better shape than the game];B[qb])))(;B[cm]LB[ip:A]C[A is also good for black (to keep white groupes separated)];W[bm];B[bl];W[cl];B[ck];W[dl];B[bj];W[dk];B[bk];W[co];B[do]C[both ok in this situation]))(;B[qr];W[ip];B[kp];W[mn];B[kn];W[nm];B[om]C[white has trouble]))(;W[qr]C[urgent move for white !];B[rq];W[ip];B[rl]LB[nn:A][mo:B]TR[rl][mp]C[after playing marked stones, exchange A to B is not good for black]))(;B[qn]C[when white descend, black should prtoect the cut];W[qr];B[rq];W[jq];B[rl]C[this variation is joseki];W[]C[after, black can still escape](;B[kp];W[lr])(;B[mq];W[ko];B[mo];W[nn]C[white has this sente ... if black escape, white would enclose black on the corner. Escaping now is not a good idea])))(;W[oq];B[nn]C[when white connect, black should push one time](;W[mo];B[rp]TR[qr]C[black can also think about the nobi because he has the ladder];W[ip]LB[jp:A][hq:B]C[white is afraid of the invasion at B ? but A is better because it seems that black can escape easially];B[kp];W[mn]C[sente move ?];B[kn];W[nm]C[white can enclose black but white side is separated])(;W[pn]C[what if white cuts ?];B[pm];W[qn];B[qm];W[ro];B[rp];W[rm];B[ql];W[rl];B[qk];W[rk];B[qj];W[ri];B[mo](;W[lr];B[rr]C[the corner is alive])(;W[rr](;B[qr];W[lr]C[hard for black to get two eyes])(;B[mq];W[qr];B[nr];W[or];B[os];W[pr];B[hq]C[black gets much territory than white])))))