(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]SZ[19]KM[6.50]GN[Cuba vs USA]PW[Santiago Alvares Martin]PB[Kevin Chao]WR[五段]BR[五段]DT[2013-02-17]EV[Cuba VS USA]RO[1]PC[The KGS Go Server at http://www.gokgs.com/]WT[Cuba]BT[USA]WL[1800]BL[1800]OM[0]OP[0.0];B[dp];W[pd]WL[1787.6];B[dc];W[pp]WL[1786.1];B[qn]BL[1798.5];W[nq]WL[1783.2];B[qj]WL[3360]BL[3540];W[qh]WL[3344.6];B[oj]BL[3533.9];W[rp]WL[3247.5];B[ce]WL[3194]BL[3464];W[jc]LB[ob:C][pc:B][qc:A][qf:D];B[qf]BL[3462.9]TR[oj]C[black san-san is also fine because at the end of joseki, marked stone is well placed to reduce white potentiel];W[pf]WL[3193.3];B[pe]BL[3461.2];W[oe]WL[3190.2]C[white has to defend from outside because ladder is good for black];B[qe]BL[3457.9](;W[of]WL[3163.6];B[qd]BL[3454.9](;W[pc]WL[3147.4];B[qc]BL[3453.4]C[having san-san point is very big !! In a situation like this, white should prefer taking corner and sacrifice the single stone.];W[qb]WL[3081.3];B[rb]BL[3423.2];W[pb]WL[3078.6];B[qg]BL[3419.9];W[ph]WL[3049.5];B[dn]WL[3042]BL[3192];W[iq]WL[2870]BL[3184];B[hd]BL[3106.3]LB[hc:A][je:B][cj:C]C[exchange A to C for black is really interesting](;W[dj]WL[2829.8](;B[ch]BL[3078]C[black should have pushed from other side];W[ql]WL[2819.5]C[locally it is not bad but, white single stone is floating];B[pl]BL[3036.6];W[dr]WL[2767.2];B[fj]BL[2967.1];W[dh]WL[2706]BL[2818];B[cg]BL[2720];W[dl]WL[2695.1];B[ek]WL[2680]BL[2681];W[cm]WL[2607.8](;B[em]BL[2632.8];W[el]WL[2596.6];B[fl]BL[2629.3](;W[fm]WL[2562.3];B[cn]BL[2594.5];W[gl]WL[2546.6];B[fk]WL[2480]BL[2592];W[fi]WL[2421.1];B[hk]BL[2562.3];W[gi]WL[2405.7];B[fn]BL[2533.6];W[gm]WL[2392.6];B[gn]BL[2499.8];W[im]WL[2311.2];B[hj]BL[2287.9];W[hi]WL[2297.6](;B[jk]BL[2238.5];W[hn]WL[2280.7];B[gq]BL[2129.8];W[bq]WL[2186.1];B[cq]BL[2090];W[cr]WL[2133.1];B[bp]BL[2078.5];W[fr]WL[2128.2];B[gr]BL[2056.3];W[dq]WL[2099.2];B[cp]BL[2054.5];W[ar];B[eq]BL[2053.5];W[fq]WL[2008]BL[2047];B[fp]BL[1956.1];W[er]WL[1995.9];B[hp]BL[1738];W[ip]WL[1979.6];B[ho]BL[1711.9];W[io]WL[1968.3];B[ji]BL[1668.3];W[ec]WL[1951.3]C[wring time to play here];B[ed]BL[1619.9];W[fc]WL[1928.5];B[fd]BL[1595.7];W[eo]WL[1888.8];B[ep]BL[1560.8];W[db]WL[1801.8];B[cc]BL[1556.5];W[gc]WL[1765.2];B[gd]BL[1548.5];W[jh]WL[1734.2]LB[ib:A]C[white can connect with A but the whole center group would be dead];B[hc]BL[1537.8]C[black should have hane first on the center and then kill white group];W[ki]WL[1715.2];B[jj]BL[1532.2];W[ih]WL[1660.6];B[pg]BL[1453.6];W[og]WL[1640.5];B[ib]BL[1423.3];W[lk]WL[1628.9];B[di]BL[1399.7];W[ei]WL[1612.5];B[ci];W[ej]WL[1611.8];B[dk]BL[1398.9];W[cj]WL[1596];B[ck]BL[1373.5];W[qm]WL[1556.8];B[oh]BL[1325.7];W[ri]WL[1446]BL[1280];B[rh]WL[1429]BL[1033](;W[nh]WL[1224.2]C[too esay for black];B[qi]BL[1027.2];W[oi]WL[1206.8];B[rj]BL[1024];W[rg]WL[1194];B[si]BL[1021];W[jb]WL[1183.3];B[ja]BL[991.4];W[ka]WL[1148.9];B[ia]BL[989.8];W[lb]WL[1127.4];B[pm]BL[976.9];W[ic]WL[1099.9];B[gb]BL[966.1]C[black can connect. less Ko threats];W[rn]WL[1073]BL[955];B[pk]BL[858.4];W[nn]WL[1049.5];B[bj]BL[765.9];W[ra]WL[1037.4];B[sb]BL[752.5];W[jl]WL[981];B[je]BL[733];W[ie]WL[950.9];B[id]BL[730];W[ke]WL[901.6];B[jd]BL[716];W[kd]WL[860.6];B[jf]BL[700.1];W[kf]WL[857.9];B[on]BL[689.5];W[no]WL[839.6];B[qo]BL[685.5];W[ro]WL[835.3];B[kl]BL[625.7];W[km]WL[808.8];B[js]BL[608.1];W[jr]WL[805.6];B[hs]BL[601.8];W[ks]WL[757.8];B[is]BL[598.5];W[kr]WL[750];B[mm]BL[589.4];W[nm]WL[742];B[ml]BL[582.8];W[nl]WL[730.4];B[mk]BL[578.3];W[mn]WL[712];B[mi]BL[572.8];W[mh]WL[701.6];B[li]BL[556.8];W[kh]WL[668.7];B[oo]BL[531.5];W[op]WL[666.4];B[il]BL[518.4];W[jm]WL[664];B[hg]BL[503.5];W[ff]WL[650.9];B[fg]BL[498.3];W[eg]WL[632];B[gf];W[df]WL[631.2];B[cf]BL[497.7];W[en]WL[625.8];B[dm]BL[490.6];W[hq];B[gp]BL[489.8];W[hl]WL[615]TR[il];B[ik]BL[483.4];W[rk]WL[611.3];B[kj]BL[465.8];W[nj]WL[595.8];B[ll]BL[457];W[lm]WL[595.2];B[nk]BL[429.4];W[ig]WL[581.9];B[if]BL[425.8];W[ni]WL[576.3];B[fe]BL[416.5];W[ef]WL[569.9];B[qk]BL[413.3];W[rl]WL[566.7];B[lh]BL[408.4];W[lg]WL[556.8];B[qp]BL[405.5];W[qq]WL[552.5];B[ap]BL[397.4];W[fs]WL[485.2];B[aq]BL[393.3];W[br]WL[482.5];B[pi]BL[387.2];W[mj]WL[477.5];B[lj]BL[384.8];W[ol]WL[469.5];B[ok]BL[381.8];W[oh]WL[465.8];B[ii]BL[376.4];W[hh]WL[461.6];B[de]BL[367.4];W[fh]WL[453.1];B[gg]BL[365];W[gs]WL[445.4];B[hr]BL[362.8];W[sk]WL[441.7];B[sj]BL[335.3];W[rd]WL[423.6];B[rc]BL[327.6];W[om]WL[401.8];B[pn]BL[324.5];W[qa]WL[393.8];B[sa]BL[307.4];W[kg]WL[380.5];B[dg]BL[303.7];W[eh]WL[380];B[gk]BL[297.8];W[po]WL[374.5];B[gh];W[hm]WL[373.6];B[gj]BL[296.8];W[ir]WL[364.5])(;W[qi];B[rj];W[oi]C[black is separated]))(;B[di];W[ei];B[ci];W[ej];B[dk];W[cj];B[ck]C[white has too many cutting stones wasted]))(;W[bo];B[bp];W[co];B[cp]LB[ci:B][bl:A]C[A makes eyes, B is also possible but white can be attacked. Futhermore, black gets ... nothing]))(;B[cn];W[el];B[fl];W[em];B[gn]))(;B[cl];W[cg];B[bj]C[no base for white]))(;W[cj]LB[ci:A]C[playing at A would be very bad. Black attack from bottom white tobi and black does not need to answer like on variation];B[ch];W[cl];B[cn]LB[bn:B]C[black has to defend or white can live with B];W[dr]))(;W[qc]C[white can't double hane];B[pc];W[od];B[qb];W[rc];B[rb];W[pb];B[oc];W[nc];B[ob];W[nb];B[pa];W[qg];B[rd]LB[nd:B][pg:A]C[black has almost 10 points and there's two cutting points on white wall]))(;W[qd];B[pg];W[of];B[qg];W[md];B[ph]TR[jc][md][pd][oe]SQ[oj][qj]C[black is overconcentrated and white formation is really good. Without two black marked stones, black would have been better]))