(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]SZ[19]KM[0.00]DT[2013-01-26]PC[The KGS Go Server at http://www.gokgs.com/];B[pp]BL[1796.51];W[dd]WL[1795.92];B[cf]BL[1792.94];W[ch]WL[1766.04];B[fc]BL[1777.02];W[df]WL[1739.86];B[cc]BL[1773.96];W[cd]WL[1727.13];B[dc]BL[1771.63];W[ed]WL[1717.24];B[bc]BL[1765.03];W[bd]WL[1706.79];B[pd]BL[1752.89];W[co]WL[1681.89];B[ep]BL[1745.93];W[dq]WL[1670.25];B[eq]BL[1719.8];W[dr]WL[1652.64]C[where is black follow up ?](;B[cp]BL[1714.56]C[not the right sequence for black];W[dp]WL[1626.44];B[do]BL[1683.61];W[cn]WL[1580.05];B[dn]BL[1627.31]C[black has to protect his weakness first, so white can keep the corner];W[cm]WL[1562.15];B[dm]BL[1617.85];W[cl]WL[1528.72];B[mp]BL[1555.6];W[qj]WL[1317.07];B[qh]BL[1504.42];W[qm]WL[1295.79];B[qo]BL[1490.08];W[oj]WL[1292.23];B[pk]BL[1487.57];W[qk]WL[1248.45];B[er]BL[1476.73];W[cq]WL[1244.61];B[om]BL[1468.51];W[kq]WL[1213.14];B[lq]BL[1451.24];W[kp]WL[1173.69];B[iq]BL[1403.44];W[ip]WL[1157.42];B[hq]BL[1380.53];W[jm]WL[1153.85];B[pj]BL[1370.21]LB[jk:A][qk:B][jm:C]C[not good for black. A is better because black can attack B and C weak groups ];W[pi]WL[1127.88];B[qi]BL[1315.76];W[pl]WL[1116.47];B[ok]BL[1313.92];W[ol]WL[1113.64];B[nk]BL[1312.98];W[nl]WL[1110.97];B[mk]BL[1300.05];W[ml]WL[1102.32]C[now, white weak groups are connected];B[jd]BL[1282.19]C[black should continue to push because white hane is sente];W[nc]WL[834.318];B[ob]BL[1267.39];W[oc]WL[788.58];B[pc]BL[1260.73];W[nb]WL[785.957];B[lc]BL[1255.13];W[pb]WL[778.284];B[qb]BL[1253.21];W[oa]WL[776.033];B[ne]BL[1250.39];W[qa]WL[709.617];B[rb]BL[1198.3];W[lb]WL[688.316];B[kb]BL[1168.84];W[mb]WL[681.119];B[lk]BL[1157.81];W[ll]WL[646.555];B[jj]BL[1095.37];W[me]WL[635.04];B[le]BL[1027.53];W[md]WL[512.238];B[mf]BL[946.38];W[dl]WL[505.42];B[kl]BL[938.617];W[km]WL[486.183];B[dg]BL[878.533];W[cg]WL[478.572];B[ef]BL[865.268];W[de]WL[470.485];B[gj]BL[850.773];W[hh]WL[233.998];B[fh]BL[781.281];W[gi]WL[179.98];B[hi]BL[729.453];W[gh]WL[111.137];B[fi]BL[655.367];W[fg]WL[73.145];B[ii]BL[616.698];W[gf]WL[35.988];B[kf]BL[545.584];W[fj]WL[30.68];B[ek]BL[537.88];W[ej]WL[16.319];B[fk]BL[511.472];W[gk]WL[30]OW[1];B[hj]BL[462.777];W[em]WL[30]OW[1];B[gl]BL[447.506];W[dk]WL[30]OW[1];B[fn]BL[428.803];W[ih]WL[30]OW[1];B[jh]BL[348.705];W[hc]WL[30]OW[1];B[gd]BL[320.794];W[hd]WL[30]OW[1];B[he]BL[262.006];W[ge]WL[30]OW[1];B[ie]BL[211.509];W[eb]WL[30]OW[1];B[ec]BL[206.107];W[fb]WL[30]OW[1];B[gc]BL[199.872];W[gb]WL[30]OW[1];B[ib]BL[195.945];W[hb]WL[30]OW[1];B[db]BL[188.295]C[how can white kills the corner ?](;W[bb]WL[30]OW[1]C[this move is not right];B[ab]BL[178.382];W[ba]WL[30]OW[1];B[ea]BL[171.43]C[if black descends, he has a big eye (5 form) and has more liberties than white];W[ad]WL[30]OW[1];B[ac]BL[132.837](;W[fa]WL[30]OW[1]C[white should throw in first];B[da]BL[123.455];W[fd]WL[30]OW[1];B[ha]BL[105.839];W[qg]WL[30]OW[1]C[the corner is black now])(;W[da];B[ca];W[fa];B[id];W[fd]C[bad Ko for black]))(;W[ab];B[bb](;W[ac];B[ca];W[ea];B[ic];W[da];B[id];W[ba])(;W[ca];B[ac];W[da];B[ea];W[ba];B[aa];W[fa];B[ha];W[ad];B[id];W[fd];B[ic]C[Ko fight])))(;B[en](;W[do]C[this peep is not good because white would want peep from outside];B[eo];W[er];B[gq])(;W[nc]C[if white does not peep];B[cp];W[dp];B[do](;W[bp];B[cn];W[bo]C[nice for black])(;W[cn];B[cq];W[cr];B[br];W[er];B[fr];W[fq];B[gr];W[bs];B[ar];W[bp];B[bq];W[bo]C[white can play the Ko but the corner was white so if black looses the Ko, that's not a big deal];B[es]))))