A few ideas:
(;CA[utf-8]RU[Japanese]OT[5x30 byo-yomi]GM[1]FF[4]AP[CGoban:3]SZ[19]ST[2]DT[2010-12-21] PC[KGS]PB[Koroviev]BR[13k]PW[Rastafa]WR[9k]KM[6.5]TM[1800]RE[W+41.5]MULTIGOGM[0] ;B[pd]BL[1782.66];W[dp]WL[1795.82];B[pp]BL[1774.84];W[dc]WL[1790.23];B[fq]BL[1770.42] ;W[cn]WL[1788.01];B[jp]BL[1765.75];W[nc]WL[1785.78];B[nd]BL[1763.04];W[md]WL[1781.4] ;B[ne]BL[1761.09];W[oc]WL[1779.92];B[pc]BL[1758.48];W[kc]WL[1779.01];B[pg]BL[1755.77] ;W[cj]WL[1776.19];B[de]BL[1752.18];W[ce]WL[1774.12];B[cf]BL[1750.62];W[cd]WL[1773.16] (;B[ee]BL[1748.2]LB[dg:b][cj:c]C[Koroviev. Should have played (b), then perhaps extended to lean on (c)? Ed. No, and no. This is wrong shape. See vars.] ;W[fc]WL[1771.99];B[dg]BL[1742.19];W[qn]WL[1769.67];B[pn]BL[1739.71];W[pm]WL[1767.86] ;B[on]BL[1735.55];W[qo]WL[1766.6];B[qp]BL[1734.07];W[qk]WL[1765.03];B[qi]BL[1732.15] LB[mp:a]C[Koroviev. Premature? I wanted to make white uncomfortable on the side, but this allowed W (a). Ed. This is OK.] (;W[mp]WL[1757.64]C[See var.] (;B[mq]BL[1725.37]LB[kq:b][lo:c][mn:d]C[Koroviev. Not sure about this: too submissive? Ed. Attaching underneath is wrong tactic here. Other ideas -- (b) to remove W base and chase W out, (c) close W, (d) cap W. See vars.] ;W[lp]WL[1743.98];B[lq]BL[1723.21];W[np]WL[1740.96];B[nq]BL[1720.84] (;W[mn]WL[1740]C[See var.];B[om]BL[1712.02];W[pl]WL[1738.51];B[pj]BL[1709.12] (;W[rp]WL[1734.96]C[See var.];B[rq]BL[1706.78] (;W[ro]WL[1733.42]C[See var.];B[qr]BL[1703.07];W[dq]WL[1728.68] (;B[eo]BL[1698.71]C[Gote. See var.] (;W[do]WL[1726.53]C[See var.];B[en]BL[1697.02];W[dl]WL[1724.22];B[ci]BL[1691.42] ;W[dj]WL[1718.56];B[di]BL[1689.79];W[hd]WL[1713.4];B[ej]BL[1684.85];W[gp]WL[1698.23] (;B[gq]BL[1677.43]C[See var.];W[fp]WL[1696.72];B[ep]BL[1675.8];W[hp]WL[1695.87] ;B[hq]BL[1673.79]LB[eq:b][eo:c][gp:d]C[Koroviev. Should have connected at (b) I think. Ed. Not yet. W (d) is running, too. Your problem is later, not now.] ;W[ip]WL[1693.69];B[iq]BL[1672.07];W[hl]WL[1693] (;B[dm]BL[1668.03]C[See vars.];W[cm]WL[1689.21] (;B[dk]BL[1664.88]C[See var.];W[ck]WL[1686.91];B[ek]BL[1663.47];W[el]WL[1686.05] (;B[bj]BL[1659.19]C[See var.];W[bk]WL[1684] (;B[ai]BL[1657.33]C[Too small. See var.];W[eq]WL[1679.18];B[fl]BL[1654.33];W[fm] WL[1672];B[em]BL[1632.27];W[cl]WL[1670.6];B[gm]BL[1630.8];W[fn]WL[1669.5];B[gl] BL[1617.07];W[fo]WL[1667.96];B[cb]BL[1606.89];W[cc]WL[1663.41];B[be]BL[1605.03] ;W[bd]WL[1662.14];B[af]BL[1603.78];W[fe]WL[1655.48];B[fi]BL[1601.61];W[fg]WL[1653.41] ;B[eh]BL[1590.26];W[od]WL[1645.36];B[oe]BL[1586.03];W[me]WL[1644.54];B[jd]BL[1583.2] ;W[jf]WL[1639.47];B[jc]BL[1580.95];W[kd]WL[1637.61];B[hb]BL[1577.79];W[gb]WL[1635.09] ;B[kb]BL[1575.82];W[lb]WL[1632.82];B[ke]BL[1570.42];W[jb]WL[1631.06];B[ib]BL[1567.98] ;W[ka]WL[1629.24];B[je]BL[1562.57];W[ic]WL[1627.88];B[kf]BL[1559.7];W[if]WL[1626.4] ;B[mf]BL[1557.87];W[ok]WL[1622.73];B[bb]BL[1539.44];W[db]WL[1617.1];B[ob]BL[1535.23] ;W[nb]WL[1615.5];B[pk]BL[1531.86];W[ol]WL[1613.69];B[rk]BL[1528.46];W[rl]WL[1608.99] ;B[qj]BL[1526.25];W[ql]WL[1608.24];B[sj]BL[1524.65];W[ml]WL[1604.45];B[oj]BL[1522.11] ;W[pb]WL[1598.24];B[qb]BL[1520.17];W[oa]WL[1596.18];B[lf]BL[1517.27];W[nf]WL[1586.6] ;B[ng]BL[1507.84];W[pe]WL[1583.72];B[of]BL[1503.95];W[qc]WL[1580.93];B[qd]BL[1502.11] ;W[rc]WL[1580.09];B[qe]BL[1500.24];W[rb]WL[1578.62];B[rd]BL[1498.2];W[kp]WL[1564.18] ;B[ad]BL[1491.8];W[ac]WL[1561.94];B[kq]BL[1488.18];W[jo]WL[1558.06];B[er]BL[1484.41] ;W[dr]WL[1556.07];B[es]BL[1480.83];W[ds]WL[1554.72];B[fr]BL[1479.04];W[jq]WL[1551.04] ;B[jr]BL[1478.07];W[hk]WL[1539.81];B[gk]BL[1467.01];W[hi]WL[1537.44];B[gj]BL[1464.25] ;W[hm]WL[1532.52];B[hj]BL[1461.51];W[ij]WL[1531.3];B[mj]BL[1459.92];W[lk]WL[1526.57] ;B[ki]BL[1458.38];W[lj]WL[1522.73];B[mi]BL[1453.32];W[li]WL[1521.33];B[lh]BL[1451.72] ;W[kj]WL[1513.15];B[ji]BL[1448.95];W[jj]WL[1509.27];B[ih]BL[1444.27];W[ii]WL[1505.92] ;B[jh]BL[1441.57];W[jg]WL[1504.11];B[kg]BL[1437.68];W[ie]WL[1502.2];B[op]BL[1432.31] ;W[nm]WL[1499.41];B[nk]BL[1426.45];W[mk]WL[1497.18];B[nj]BL[1423.69];W[hg]WL[1491.45] ;B[nl]BL[1421.04];W[rm]WL[1481.01];B[jp]BL[1397.53];W[ak]WL[1471.78];B[gh]BL[1388.81] ;W[gg]WL[1469.67];B[hh]BL[1386.78];W[aj]WL[1465.27];B[bi]BL[1385.09];W[gn]WL[1460.23] ;B[ae]BL[1381.51];W[bc]WL[1458.02];B[ed]BL[1362.2];W[fd]WL[1453.66];B[ec]BL[1360.55] ;W[eb]WL[1452.37];B[hc]BL[1350.55];W[id]WL[1450.09];B[gc]BL[1349.21];W[gd]WL[1445.68] ;B[ga]BL[1346.58];W[fb]WL[1443.29];B[ld]BL[1339.46];W[lc]WL[1440.14];B[le]BL[1337.71] ;W[mc]WL[1438.41];B[sc]BL[1334.6];W[sb]WL[1436.92];B[sd]BL[1332.63];W[sq]WL[1433.03] ;B[sr]BL[1329.07];W[sp]WL[1430.21];B[nn]BL[1324.92];W[mm]WL[1428.27];B[no]BL[1322.86] ;W[po]WL[1426.94];B[oo]BL[1320.31];W[mo]WL[1424.82];B[oq]BL[1316.11];W[sl]WL[1421.12] ;B[jq]BL[1312.12];W[sk]WL[1418.71];B[rj]BL[1310.5];W[ef]WL[1415.13];B[df]BL[1305.47] ;W[eg]WL[1413.75];B[fh]BL[1302.28];W[]WL[1395.17];B[]BL[1259.8]TB[rf][lr][pe][re] [se][bf][nf][pf][qf][sf][ag][bg][cg][lg][mg][og][qg][rg][sg][ah][bh][ch][dh][kh] [mh][nh][oh][ph][qh][rh][sh][ei][ni][oi][pi][ri][si][fj][fk][pq][qq][gr][hr][ir] [kr][mr][nr][or][pr][rr][fs][gs][hs][is][js][ks][ls][ms][ns][os][ps][qs][rs][ss] TW[bo][co][eo][go][ho][io][ko][lo][so][ap][ab][cp][ep][aq][bq][cq][ar][br][cr][as] [bs][cs][aa][ba][ca][da][ea][fa][ga][bp][ha][ia][ja][la][ma][na][pa][qa][ra][sa] [bb][cb][hb][ib][kb][mb][ob][qb][gc][hc][ge][he][ff][gf][hf][ik][jk][kk][al][bl] [il][jl][kl][ll][am][bm][en][dm][em][im][jm][km][lm][qm][sm][an][bn][dn][hn][in] [jn][kn][ln][rn][sn][ao]) (;B[eq])) (;B[fl];W[em];B[fm];W[dn];B[gn])) (;B[el])) (;B[el]) (;B[jo];W[hn];B[el])) (;B[fp]C[B is stronger than W here. Fight back.])) (;W[op];B[oq];W[po];B[oo];W[nl])) (;B[op])) (;W[so]C[Better eyeshape.])) (;W[op];B[oq];W[po];B[oo];W[nl])) (;W[op]C[W can cut B off in sente.];B[oq];W[po];B[oo];W[om])) (;B[kq];W[mn];B[om];W[pl]LB[qk:a]C[Difficult to say what is the profit for B this way. Maybe if B can kill W (a)...]) (;B[lo]C[Lots of reading.]) (;B[mn]C[Lots of reading.])) (;W[nq]C[Standard.])) (;B[dg];W[fc] (;B[ci]C[See also var.];W[dj]LB[ci:a]C[Ed. (a) is not a lean. (a) is hitting yourself against a wall, and this helps W.]) (;B[dj];W[ci];B[di];W[dk];B[ek];W[dl]C[This way you help W to take a lot of territory.])) (;B[df]C[If B just connects...];W[fc]LB[dh:a][ch:b][cj:c]C[Now because of W (c), B can only jump to (a) or (b), neither satisfactory. See var.]) (;B[ff]LB[cj:a]C[Since W already has a stone at (a), B can consider playing lightly, like this.]))
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