(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]HA[2]KM[6.50]TM[1800]OT[5x30 byo-yomi]
PW[petroskyu]PB[TomMeehan]WR[14k]DT[2014-04-22]PC[The KGS Go Server at http://www.gokgs.com/]AB[pd][dp]C[The point that stands out for me in this game is about invading, or rather, not invading. Black has many great opportunities to invade, but never does.

The thing to realise is that not all invasions are the same. If you just leap in to your opponent's area of strength, you will get attacked and that is no fun at all. However, most of the invasion opportunities in this game are of the other sort. By jumping in between your opponent's stones you separate at least one weak group from the rest and then it is a fair fight. You would expect both groups to run away and eventually survive, but in the process your invasion has succeeded and destroyed an area of your opponent's territory. This is the sort of invasion that you should be looking out for, and as I said, Black misses several opportunities in this game.
]RE[W+5.50]
;W[pp]WL[1796.044]
;B[nq]BL[1783.387]C[Playing in the empty corner would be normal.
]
;W[pj]WL[1752.151]LB[pm:C][qm:D][pn:B][qn:A]C[Another odd move for no good reason. White will have to come back to A, B, C or D at some time, after which this last move might not be on exactly the point you want it. Better to play one of A-D first.]
;B[cd]BL[1757.126]C[Good.]
;W[ed]WL[1726.579]
;B[dc]BL[1740.143]LB[ec:E]C[This is not good. It is too small. If you want to take the corner territory, attach at E.]
;W[ec]WL[1721.577]
;B[cg]BL[1728.922]
;W[jd]WL[1718.932]LB[lc:F][hd:G]C[Greedy. The proverb is to extend 3 from a 2-stone wall. If Black now plays F, white needs a move, but doesn't  have a great. one. The invasion at G is also tempting.]
;B[kq]BL[1713.846]LB[pm:C]C[This is a bit slow. Since White omitted a move, I want to play a double-approach. I would probably choose C, but they are all good. A double-approach here would be an example of a good invasion.]
;W[qf]WL[1711.055]
;B[nc]BL[1710.972]C[Good.]
;W[lc]WL[1702.673]
;B[rd]BL[1705.565]C[Good.]
;W[cn]WL[1687.782]
;B[fq]BL[1693.95]TR[kq]C[Because the triangled stone is low, it would be better balance to play this on the 4th line.]
;W[ck]WL[1684.827]LB[hd:G][pm:C]TR[kq]C[This is a really good moment to stop and look at what a good invasion is like.

The invasion at G is now really good, because it threatens to split White into two weak groups. White will be on the defensive, so Black will be in little danger.

Also, because Black now has the marked extension, the double-approach around C is a strong attack on the corner, and once White has defended that, the three-space extension above will be weak and can then be attacked.

So, Black has various good atacking options. In contrast, the move played is rather passive.

Let's look at some variations.]
(;B[em]BL[1680.168]
;W[ip]WL[1660.833]C[With all the other weaknesses on the board, this is very risky.

This is also an example of the kind of invasion you don't want to play. The black groups on both sides are quite strong, so only White will be attacked.]
;B[ko]BL[1657.57]
;W[in]WL[1659.143]
;B[km]BL[1655.235]
;W[il]WL[1657.084]
;B[kk]BL[1625.038]
;W[pn]WL[1654.454]LB[pm:C]C[Because Black has become very strong in the centre (the kind of good result you can get when you are attacking), White feels it is necesary to defend here before Black plays a good invasion at C. However, now is not a good time to play on the right.]
(;B[qq]BL[1606.236]C[So, missed opportunity. Also, this is dangerous. It makes the black group weaker. If Black gets weak, then White's invasion with the three stones becomes a good invasion, cutting off a weak group. By move 29, you can see this risk is realised.]
;W[pq]WL[1650.575]
;B[pr]BL[1604.04]
;W[or]WL[1649.298]
;B[rr]BL[1599.081]
;W[oq]WL[1642.096]C[White should atari before connecting.]
;B[ps]BL[1565.375]LB[rn:J]C[Not best. Can be at J.]
;W[qp]WL[1638.136]
;B[rp]BL[1558.534]
;W[ro]WL[1636.664]
;B[sp]BL[1551.386]
;W[rn]WL[1625.66]
;B[nr]BL[1547.904]
;W[os]WL[1623.7]
;B[qs]BL[1537.942]LB[rs:K]C[K is safer. This move leaves ko possibilties.]
;W[np]WL[1621.829]
;B[mp]BL[1535.363]
;W[ij]WL[1606.231]C[Lucky White!]
;B[qh]BL[1501.272]LB[hd:G]C[This is an example of a good invasion, but quite a small one. It only threatens to cut off one stone. Of course, I still want to play G.]
;W[of]WL[1598.945]
;B[sg]BL[1474.796]
;W[re]WL[1590.563]
;B[se]BL[1473.24]
;W[rg]WL[1586.79]
;B[rh]BL[1465.206]LB[dc:6][ec:7][lc:13][nc:12][cd:4][ed:5][jd:9][rd:14][re:47][se:48][of:45][qf:11][cg:8][rg:49][sg:46][qh:44][rh:50][ij:43][pj:3][ck:17][kk:24][il:23][em:18][km:22][cn:15][in:21][pn:25][rn:37][ko:20][ro:35][ip:19][mp:42][np:41][pp:1][qp:33][rp:34][sp:36][fq:16][kq:10][nq:2][oq:31][pq:27][qq:26][nr:38][or:29][pr:28][rr:30][os:39][ps:32][qs:40]
;W[qd]WL[1583.734]
;B[qc]BL[1452.07]
;W[qe]WL[1581.351]
;B[rc]BL[1444.483]
;W[ph]WL[1571.464]
;B[rk]BL[1415.193]
;W[rj]WL[1562.824]
;B[qj]BL[1403.535]
;W[qi]WL[1560.976]
;B[sj]BL[1400.14]
;W[qk]WL[1558.283]
;B[ri]BL[1391.38]
;W[qj]WL[1554.217]
;B[rl]BL[1370.341]
;W[ql]WL[1551.249]
;B[ir]BL[1319.478]
;W[jq]WL[1517.623]
;B[jr]BL[1316.407]
;W[eo]WL[1514.516]
;B[do]BL[1304.904]
;W[bp]WL[1511.714]
;B[cq]BL[1301.509]
;W[bq]WL[1509.988]
;B[br]BL[1299.5]
;W[cp]WL[1508.534]
;B[dq]BL[1297.677]
;W[en]WL[1504.861]
;B[dn]BL[1295.081]
;W[cm]WL[1500.598]
;B[fn]BL[1263.901]
;W[fo]WL[1483.309]
;B[go]BL[1261.788]
;W[gn]WL[1480.716]
;B[fm]BL[1258.305]
;W[gp]WL[1479.541]
;B[ho]BL[1254.308]
;W[fp]WL[1473.347]
;B[io]BL[1216.933]
;W[jo]WL[1468.852]
;B[iq]BL[1214.394]
;W[jp]WL[1463.846]
;B[hp]BL[1211.959]C[Oops!]
;W[hq]WL[1461.504]
;B[kp]BL[1182.361]
;W[jn]WL[1442.185]
;B[gq]BL[1159.538]
;W[hn]WL[1438.855]
;B[dm]BL[1154.012]
;W[cl]WL[1435.043]
;B[bi]BL[1108.053]
;W[bj]WL[1432.704]
;B[ci]BL[1101.833]
;W[ki]WL[1420.162]
;B[ho]BL[1081.13]C[This is pointless. There is no way this white group will die, so this is worth -1 point.]
;W[hp]WL[1413.805]
;B[im]BL[1034.955]
;W[jm]WL[1409.326]
;B[hm]BL[1033.77]
;W[kl]WL[1407.471]
;B[lm]BL[1014.721]
;W[kn]WL[1403.551]
;B[ln]BL[1012.923]
;W[gm]WL[1402.397]
;B[hl]BL[1009.893]
;W[gl]WL[1400.312]
;B[hk]BL[1005.995]
;W[gk]WL[1398.643]
;B[ik]BL[981.611]
;W[jl]WL[1393.481]
;B[jk]BL[979.552]
;W[ll]WL[1391.251]C[Now Black has a weak group cut off, and it just has to run away while White attacks. This is a typical result from a bad invasion, although here it did not actually start with an invasion as such - still, it is no fun to be in this situation.]
;B[ii]BL[975.619]
;W[jj]WL[1383.206]
;B[hj]BL[973.687]
;W[gj]WL[1374.859]
;B[ji]BL[962.207]
;W[kj]WL[1373.059]
;B[gi]BL[960.968]
;W[fi]WL[1366.664]
;B[gh]BL[956.6]
;W[fh]WL[1364.46]
;B[gg]BL[946.687]
;W[fg]WL[1361.07]
;B[gf]BL[941.322]
;W[ff]WL[1358.994]
;B[jg]BL[937.851]
;W[if]WL[1355.985]
;B[ig]BL[930.918]
;W[ge]WL[1353.236]C[For example, the white group at the top is now safe. White was able to defend it in sente while attacking.]
;B[kh]BL[923.056]
;W[lh]WL[1351.184]
;B[li]BL[886.643]
;W[lj]WL[1349.206]
;B[lg]BL[879.131]
;W[mi]WL[1346.685]
;B[ih]BL[850.603]
;W[md]WL[1327.06]
;B[hi]BL[798.487]
;W[kf]WL[1318.768]
;B[kg]BL[796.651]
;W[hf]WL[1317.306]
;B[hg]BL[794.713]
;W[mb]WL[1310.668]
;B[na]BL[793.354]
;W[ma]WL[1308.817]
;B[nb]BL[791.493]
;W[db]WL[1306.43]
;B[cb]BL[772.675]
;W[eb]WL[1304.416]
;B[hr]BL[704.017]
;W[ns]WL[1297.832]
;B[ms]BL[701.759]
;W[mq]WL[1292.705]
;B[mr]BL[694.338]
;W[mo]WL[1291.182]
;B[lp]BL[686.112]
;W[no]WL[1289.656]
;B[lo]BL[684.119]
;W[ek]WL[1286.863]
;B[nm]BL[635.436]
;W[ml]WL[1280.386]
;B[nn]BL[630.125]
;W[mm]WL[1278.263]
;B[mn]BL[628.941]
;W[ol]WL[1276.405]
;B[nl]BL[613.892]
;W[nk]WL[1273.206]
;B[om]BL[611.297]
;W[pm]WL[1270.697]
;B[mc]BL[551.323]
;W[lb]WL[1263.869]
;B[de]BL[546.965]
;W[on]WL[1259.475]
;B[lq]BL[543.105]
;W[ee]WL[1249.846]
;B[cj]BL[539.312]
;W[ak]WL[1246.933]
;B[jf]BL[532.006]
;W[je]WL[1243.03]
;B[le]BL[517.924]
;W[ld]WL[1235.67]
;B[ke]BL[511.855]
;W[kd]WL[1231.659]
;B[me]BL[507.083]
;W[ne]WL[1228.383]
;B[mg]BL[503.284]
;W[nh]WL[1188.774]
;B[nd]BL[486.377]
;W[ng]WL[1180.688]
;B[oe]BL[467.884]
;W[nf]WL[1177.716]
;B[mf]BL[465.672]
;W[pe]WL[1174.559]
;B[od]BL[463.902]
;W[rm]WL[1171.959]
;B[sk]BL[456.819]
;W[sm]WL[1168.945]
;B[sf]BL[405.102]
;W[sl]WL[1132.388]
;B[si]BL[401.92]
;W[qg]WL[1130.249]
;B[sh]BL[400.591]
;W[rf]WL[1128.785]
;B[sd]BL[399.373]
;W[so]WL[1119.291]
;B[sq]BL[396.051]LB[rs:K]C[Necessary. Would not be necessary if Black had defended the corner with K originally.]
;W[df]WL[1117.925]
;B[cf]BL[392.62]
;W[dg]WL[1116.754]
;B[dh]BL[390.639]
;W[dd]WL[1115.678]
;B[cc]BL[387.941]
;W[ce]WL[1114.327]
;B[be]BL[387.168]
;W[de]WL[1112.084]
;B[bf]BL[385.393]
;W[eh]WL[1110.112]
;B[ei]BL[379.411]
;W[ej]WL[1107.407]
;B[di]BL[378.401]
;W[co]WL[1104.912]
;B[lk]BL[359.148]
;W[mk]WL[1100.652]
;B[ep]BL[303.452]
;W[ar]WL[1097.81]
;B[bs]BL[300.302]
;W[ca]WL[1096.304]
;B[bb]BL[282.173]
;W[ai]WL[1092.064]
;B[ah]BL[273.27]
;W[aj]WL[1084.404]
;B[bh]BL[269.499]
;W[ba]WL[1074.417]
;B[mh]BL[251.006]
;W[li]WL[1054.611]C[Oops! Luckily, this does not lose the game.]
;B[ni]BL[230.491]
(;W[nj]WL[1035.213]TR[mj]C[Connecting at the triangled point would be disastrous - see the variation.]
;B[mj]BL[221.879]
;W[oi]WL[1016.321]
;B[mi]BL[130.915]
;W[ok]WL[1012.707]
;B[ab]BL[105.864]
;W[el]WL[989.899]
;B[fl]BL[91.273]
;W[fk]WL[984.464]
;B[cr]BL[72.681]
;W[dj]WL[982.2]
;B[dl]BL[67.444]
;W[dk]WL[979.243]
;B[as]BL[65.131]
;W[aq]WL[977.515]
;B[aa]BL[52.976]
;W[da]WL[976.029]
;B[]BL[31.33]
;W[bd]WL[973.242]
;B[ad]BL[11.411]
;W[ae]WL[951.872]
;B[af]BL[30]OB[5]
;W[he]WL[925.387]
;B[]BL[30]OB[5]
;W[]WL[925.386]TW[ea][fa][ga][ha][ia][ja][ka][la][fb][gb][hb][ib][jb][kb][fc][gc][hc][ic][jc][kc][fd][gd][hd][id][fe][ie][ef][pf][eg][og][pg][oh][pi][fj][oj][bk][pk][al][bl][pl][am][bm][qm][an][bn][qn][sn][ao][bo][go][ho][io][oo][po][qo][ap][op]TB[oa][pa][qa][ra][sa][ob][pb][qb][rb][sb][ac][bc][oc][pc][sc][bd][ae][kf][lf][ag][bg][ch][hh][jh][lh][ki][li][ij][jj][kj][lj][eq][mq][rq][dr][er][fr][gr][kr][lr][qr][sr][cs][ds][es][fs][gs][hs][is][js][ks][ls][rs][ss]C[White wins by 5.5.])
(;W[mj]
;B[pg]
;W[pf]
;B[oh]
;W[og]
;B[pg]))
(;B[ij]LB[hd:G][bo:H]C[This black move is really wonderful.

White now has to try to survive with his three stones. It does not matter if they live. Black does not need to go all out to kill them. Just play moves that attack a bit, while doing something else like making territory or influence.

If Black gets stronger in the upper centre, the good invasion at G gets even better. If Black gets stronger towards the right, then it may be possible to attack the white stones a bit with a move like H. Again, you don't need to attack to try to kill. Just playing H in sente to secure the corner is a great gain.]))
(;B[hd]
;W[hc]
;B[gc]
;W[gd]
;B[ic]
;W[id]
;B[he]
;W[hb]
;B[gb]
;W[ib]
;B[eb]C[There are many possible variations here. Even if you can't read them all out, it does not matter. Like here, Black will almost certainly get something.])
(;B[gb]C[In fact, in this shape, this is the vital point. If Black stops White connecting, ...]
;W[fb]
;B[gd]
;W[ge]
;B[he]
;W[hc]
;B[gc]
;W[hd]
;B[fe]
;W[gf]
;B[fd]C[Again, many complex variations, but it does not matter. Black will almost certainly get something.])
(;B[pm]
;W[oo]
;B[nm]
;W[pr]
;B[qh]C[Fun for Black.]))
