Quick review for Aphelion's game (focuses mostly on Aphelion's moves, since he helped me out for something else):
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[AGA]SZ[19]KM[7.50]TM[2400]OT[10/300 Canadian]
PW[LiKao]PB[Aphelion02]WR[6k]BR[6k]DT[2010-06-04]PC[The KGS Go Server at <!-- m --><a class="postlink" href="http://www.gokgs.com/">http://www.gokgs.com/</a><!-- m -->]
;B[qd]BL[2393.901]
;W[dd]WL[2361.095]
;B[pq]BL[2391.392]
;W[dp]WL[2358.027]
;B[oc]BL[2389.763]
;W[pj]WL[2351.16]C[This move is highly skeptical. See variation.]
(;B[qn]BL[2356.983]C[Also works.]
;W[jq]WL[2337.801]
;B[cn]BL[2348.491]
;W[dl]WL[2331.548]
;B[cq]BL[2343.862]
;W[dq]WL[2328.176]
;B[cp]BL[2342.347]
;W[do]WL[2326.959]
;B[co]BL[2316.57]
;W[dn]WL[2321.322]
;B[cm]BL[2303.745]
;W[np]WL[2313.842]
;B[qh]BL[2290.997]LB[gc:1][hc:2][ic:3][jc:4][kc:5][lc:6][mc:7][nc:8]TR[fc]C[This move is big but I think F17 is even bigger. A general rule of thumb for the early game is just looking at the number of spaces between the move you play and the nearest stone.]
;W[pm]WL[2310.335]
;B[pn]BL[2288.998]C[This move is excellent because it not only breaks out and prevents White from sealing Black, but also takes care of some weaknesses in the large shimari that you played (you'd be surprised by how fragile a large shimari can be).]
;W[on]WL[2308.645]
;B[om]BL[2285.595]
;W[nn]WL[2300.44]
(;B[ol]BL[2282.516]
(;W[nj]WL[2297.254]
;B[ml]BL[2277.994]
;W[pl]WL[2295.711]
;B[ok]BL[2259.685]
;W[pk]WL[2290.483]
(;B[oh]BL[2230.986]
;W[oj]WL[2285.893]LB[oh:1][oj:2]TR[ok][ol][om]C[This is a bad exchange because now you have to end up investing an extra move to protect the 3 stones.]
;B[mm]BL[2226.016]
;W[jc]WL[2277.054]
;B[mh]BL[2220.177]
;W[lj]WL[2275.243]LB[mh:1][lj:2]C[Another bad exchange, notice how much more in danger the P9 group is now.]
;B[kl]BL[2218.182]
;W[km]WL[2269.894]
;B[ki]BL[2189.83]C[This move is a bit of an overplay; see variation. The simple move is best here; to just extend out to K8. You can't be on the offensive against this W group when your own group at N8 is weak. To strike, you must first close your first...or something like that.]
(;W[kk]WL[2263.133]C[Not good; W should have just pushed out to L10; see variation one move behind.]
;B[jl]BL[2178.063]
;W[ll]WL[2256.731]
;B[lm]BL[2175.905]
;W[lk]WL[2255.28]
;B[kn]BL[2140.694]
;W[jk]WL[2245.946]
;B[jm]BL[2138.223]
;W[jn]WL[2237.998]C[Overambitious by W.]
;B[jo]BL[2132.554]
;W[in]WL[2236.59]LB[in:2][jo:1]
;B[io]BL[2128.031]
;W[hn]WL[2231.36]
;B[lp]BL[2106.987]
;W[lq]WL[2226.252]
(;B[kq]BL[1806.37]
;W[kr]WL[2167.153]
(;B[mq]BL[1802.3]
;W[kp]WL[2164.822]
;B[mp]BL[1800.316]
;W[ko]WL[2162.982]
;B[lo]BL[1798.419]
;W[il]WL[2157.915]C[Successful for B, but I think B could have done better; see (rather long, but most of the sequence is a one-way street) variation.]
;B[cf]BL[1743.054]
;W[ce]WL[2151.752]
;B[df]BL[1739.851]
;W[ci]WL[2145.266]
(;B[fc]BL[1707.475]
;W[fd]WL[2135.529]
;B[gd]BL[1703.2]
;W[fe]WL[2129.986]
;B[ec]BL[1694.334]
;W[dc]WL[2125.763]
;B[hc]BL[1691.122]
;W[ig]WL[2119.905]
(;B[ch]BL[1681.048]
;W[dh]WL[2117.549]
;B[ie]BL[1612.248]
;W[hf]WL[2108.836]
;B[ke]BL[1585.042]
;W[kg]WL[2105.505]
;B[di]BL[1563.569]
;W[cj]WL[2094.68]
;B[eh]BL[1561.254]
;W[ei]WL[2092.21]
;B[dg]BL[1557.643]
;W[bh]WL[2084.445]
;B[bg]BL[1554.314]
;W[ai]WL[2082.565]
;B[be]BL[1545.061]
;W[bd]WL[2081.512]
(;B[af]BL[1536.705]C[Too passive; see variation one move behind.]
;W[de]WL[2076.796]
;B[dj]BL[1499.38]
;W[dk]WL[2074.502]
;B[ej]BL[1494.367]
;W[bl]WL[2064.938]
;B[cl]BL[1453.294]
;W[ck]WL[2061.377]
;B[dm]BL[1428.052]
;W[em]WL[2059.968]
;B[dr]BL[1426.418]
;W[er]WL[2058.586]
;B[cr]BL[1425.007]C[Easy game for B up to here, remove any possibilities for your opponent, even if it's at the cost of some points (so counting's important); marginal advantage

. Commentary ends here.]
;W[fi]WL[2055.627]
;B[ag]BL[1422.268]
;W[fh]WL[2048.933]
;B[fk]BL[1385.689]
;W[fl]WL[2044.566]
;B[lf]BL[1351.025]
;W[li]WL[2036.397]
;B[gk]BL[1343.337]
;W[hj]WL[2031.732]
;B[fg]BL[1338.944]
;W[ef]WL[2028.15]
;B[eg]BL[1334.976]
;W[gg]WL[2027.085]
;B[lc]BL[1298.879]
;W[ad]WL[2024.347]
;B[ae]BL[1294.649]
;W[db]WL[2022.338]
;B[eb]BL[1249.978]
;W[jf]WL[2015.103]
;B[je]BL[1244.31]
;W[im]WL[2001.972]
;B[da]BL[1229.96]
;W[ca]WL[1999.161]
;B[ea]BL[1228.148]
;W[cb]WL[1997.893]
;B[km]BL[1021.272]
;W[qi]WL[1975.493]
;B[rh]BL[1015.628]
;W[ri]WL[1970.72]
;B[rl]BL[1012.623]
;W[qm]WL[1968.163]
;B[rm]BL[1010.816]
;W[rn]WL[1947.28]
;B[ro]BL[999.295]
;W[po]WL[1943.744]
;B[qo]BL[997.126]
;W[pp]WL[1942.44]
;B[oq]BL[974.384]
;W[qp]WL[1939.411]
;B[rp]BL[972.726]
;W[qq]WL[1936.66]
;B[op]BL[943.572]
;W[nq]WL[1927.39]
;B[nr]BL[918.122]
;W[no]WL[1925.823]
;B[mr]BL[915.791]
;W[pr]WL[1904.107]
;B[or]BL[908.235]
;W[qs]WL[1895.214]
;B[rr]BL[899.352]
;W[mk]WL[1883.751]
;B[bm]BL[876.022]
;W[ak]WL[1880.335]
;B[gl]BL[854.062]
;W[gm]WL[1877.716]
;B[es]BL[852.095]
;W[fr]WL[1876.347]
;B[fs]BL[849.861]
;W[gs]WL[1875.436]
;B[ds]BL[848.458]
;W[gr]WL[1874.832]
;B[lh]BL[822.274]
;W[kh]WL[1873.479]
;B[si]BL[795.852]
;W[ph]WL[1870.021]
;B[pg]BL[793.549]
;W[nh]WL[1864.145]
;B[ng]BL[786.809]
;W[lg]WL[1854.82]
;B[mg]BL[775.732]
;W[ni]WL[1853.528]
;B[pi]BL[773.305]
;W[rj]WL[1848.826]
;B[ff]BL[704.831]
;W[ge]WL[1842.994]
;B[he]BL[701.776]
;W[fj]WL[1839.919]
;B[ek]BL[685.438]
;W[gf]WL[1835.945]
;B[ls]BL[652.363]
;W[lr]WL[1833.242]
;B[ee]BL[616.649]
;W[ed]WL[1829.904]
;B[ks]BL[605.25]
;W[js]WL[1828.183]
;B[ms]BL[603.252]
;W[ip]WL[1818.22]
;B[gj]BL[595.278]
;W[gi]WL[1816.256]
;B[hk]BL[593.124]
;W[ij]WL[1813.906]
;B[ah]BL[535.026]
;W[el]WL[1807.635]
;B[bi]BL[525.668]
;W[bj]WL[1805.928]
;B[aj]BL[523.649]
;W[mn]WL[1793.01]
;B[ln]BL[518.621]
;W[ai]WL[1790.174]
;B[jr]BL[466.954]
;W[ir]WL[1787.878]
;B[aj]BL[465.132]
;W[rk]WL[1776.933]
;B[am]BL[457.101]
;W[ai]WL[1774.362]
;B[is]BL[452.23]
;W[hs]WL[1770.969]
;B[aj]BL[450.306]
;W[sj]WL[1768.601]
;B[sh]BL[447.861]
;W[ai]WL[1765.878]
;B[jp]BL[445.183]
;W[ho]WL[1763.788]
;B[aj]BL[443.261]
;W[ql]WL[1744.054]
;B[qr]BL[417.548]
;W[rq]WL[1736.293]
(;B[ps]BL[410.378]
;W[sn]WL[1729.237]
;B[oo]BL[391.006]
;W[ai]WL[1719.489]
;B[hi]BL[376.675]
;W[gh]WL[1717.005]
;B[aj]BL[374.675]
;W[nl]WL[1714.964]
;B[nm]BL[371.816]
;W[ai]WL[1707.132]
;B[nk]BL[368.899]
;W[bh]WL[1704.52]
;B[mi]BL[364.721]
;W[mj]WL[1689.105]
;B[bi]BL[360.278]
;W[aj]WL[1671.78]
;B[oi]BL[343.475]
;W[al]WL[1668.836]
;B[bh]BL[315.45]
;W[kf]WL[1662.247]
;B[sq]BL[291.561]
;W[sm]WL[1658.982]
;B[so]BL[289.559]
;W[sl]WL[1657.975]
;B[hl]BL[283.86]
;W[hm]WL[1646.003]
;B[ef]BL[277.329]
;W[if]WL[1644.691]
;B[le]BL[271.374]
;W[ik]WL[1637.559]
;B[dh]BL[268.538]
;W[]WL[1637.558]
;B[]BL[268.537]TW[aa][ba][ab][bb][ac][bc][cc][cd][hg][jg][hh][ih][jh][hi][ii][ji][ki][jj][kj][qj][bk][qk][sk][rl][fm][rm][en][fn][gn][eo][fo][go][io][jo][ep][fp][gp][hp][jp][eq][fq][gq][hq][iq][kq][hr][jr][is]TB[fa][ga][ha][ia][ja][ka][la][ma][na][oa][pa][qa][ra][sa][fb][gb][hb][ib][jb][kb][lb][mb][nb][ob][pb][qb][rb][sb][gc][ic][jc][kc][mc][nc][pc][qc][rc][sc][hd][id][jd][kd][ld][md][nd][od][pd][rd][sd][me][ne][oe][pe][qe][re][se][bf][mf][nf][of][pf][qf][rf][sf][cg][og][qg][rg][sg][ph][nl][an][bn][mn][nn][on][ao][bo][mo][no][po][ap][bp][np][pp][qp][sp][aq][bq][nq][qq][rq][ar][br][pr][sr][as][bs][cs][ns][os][qs][rs][ss])
(;B[sn]C[:)]))
(;B[de]
;W[cd]
;B[ed]
;W[ee]C[White can't cut, because...]
(;B[gf]C[While Black can live like this, I don't think this is such a great choice because...]
;W[he]
;B[ge]
;W[id]C[Black's top is ruined. Also, I don't think the corner is cleanly killable.]
;B[cb]
;W[db]
;B[bc]
;W[ae]
;B[bf]
;W[ab]
;B[bb]
;W[ba]C[Ko.])
(;B[ge]
;W[ff]
;B[gf]
;W[fg]
;B[gg]
;W[fh]
;B[fi]
(;W[gi]
;B[ej]
(;W[gh]
;B[gj]
;W[hj]LB[eg:A][dj:B]C[Alive in sente, A and B are miai.])
(;W[fj]
;B[ei]C[Since you have a steady lead, there is no need to be greedy; just fill the ko.]
;W[gh]LB[eg:A]C[Black can live at any time with 'A'.]))
(;W[gh]
;B[dj]
;W[ej]
;B[ek]
;W[fj]
;B[fk]
;W[gj]
;B[dk]
(;W[ck]
;B[cl]C[White dies.]
;W[bl]
;B[bj]
;W[bk]
;B[bm])
(;W[cl]
;B[ck]
;W[bl]
;B[bk]
;W[cr]
;B[br]
;W[dr]
;B[bs]C[Black is still safe.])))))
(;B[ed]C[Why not cut?]
;W[ee]
;B[de]
(;W[be]
;B[gf])
(;W[eg]
;B[bd]
(;W[be]
;B[cd])
(;W[cd]
;B[be]
;W[bc]
;B[db]))))
(;B[ed]
;W[ec]
;B[fc]C[A stronger way to respond.]))
(;B[kp]
;W[mq]
;B[ir]
;W[jr]
;B[iq]
;W[ip]
;B[hp]
;W[jp]
;B[ho]
;W[hq]
;B[gq]
;W[hr]
;B[gr]
;W[is]
;B[gn]SQ[dn][do][dp][dq]C[A gentler way to handle the situation. This way is also very good for Black because, even though White lives on the bottom, your group also ends up very solid. Note how the thickness D6 once was is now very weak with the cut at D7 for White to be wary of now.]
;W[il]C[This move is not as effective as it looks.]
;B[gm]
;W[hl]
;B[dm]
;W[em]
;B[en]
;W[fn]
;B[fm]
;W[eo]
;B[el]
;W[fl]C[Not really a ko fight, because even if you were to never play it...]
;B[ek]
;W[go]
;B[gp]
;W[fo]
;B[gl]
;W[fk]
;B[gk]
;W[fj]
;B[gj]
;W[dk]
;B[ej]
;W[fi]
;B[dj]
;W[gi]
;B[ik]
(;W[im]
;B[km]
;W[hk]
;B[hj]
;W[ij]
;B[hi]C[Disaster for White, both H12 and J11 fail.])
(;W[hk]
;B[im])))
(;B[mq]C[This way is better me thinks.]
;W[mp]
;B[nq]
(;W[kp]
;B[lo]
;W[ko]
;B[lr]
;W[kq]
;B[hl]TR[nn][on][mp][np])
(;W[lo]
;B[kp]C[White can't play at L5.])))
(;W[kj]
;B[jj]
;W[jk]
;B[kk]
;W[jl]
;B[mk]
;W[mj]C[Not enough liberties (for B).]
;B[jm]
;W[ij]
;B[ji]
;W[kn]))
(;B[oj]C[Better to just cut.]
;W[oi]
;B[ni]
(;W[mj]
;B[pi]
;W[oh]
;B[mk]TR[pj][pk][pl][pm])
(;W[pi]
;B[mi]C[White's group is weak while your group is safe and gains some control of the outside. R12 is a thorn to the White group's side.])))
(;W[pl]C[Like this Black is separated.]
;B[ok]
;W[pk]
;B[oj]
;W[pi]))
(;B[pl]C[Simply capturing is better. See variation in next move.]))
(;B[ql]
;W[qg]LB[rj:A]C[Even if W tries to settle with R13, White still has a weak spot at 'A' which, if Black plays, leaves W without a base. This is why the usual move is R10 instead of Q10.]))