(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]HA[3]KM[0.50]TM[1800]OT[5x30 byo-yomi]
PW[John Collins]PB[Peran Truscott]WR[9k]BR[12k]DT[2013-04-08]EV[BGA On-line League]RO[Division 3]PC[The KGS Go Server at http://www.gokgs.com/]WT[St Albans Kyus]BT[UK Youth]AN[Tim Hunt, 2d [& snippets by Martin Harvey, 5k\]]AB[pd][dp][pp]RE[B+75.50]
;W[dd]WL[1795.495]
;B[kc]BL[1786.675]
;W[qn]WL[1775.347]
;B[qk]BL[1776.551]
;W[qq]WL[1772.304]
;B[qp]BL[1766.636]
;W[pq]WL[1760.954]
(;B[oq]BL[1740.631]TR[qn]C[


This is a mistake, and White punishes it. See the variation for the normal move.

(This is the correct move when the marked white stone is not on the board.)]
;W[rq]WL[1742.382]
;B[rp]BL[1728.974]
;W[op]WL[1740.637]C[Now Black has a big problem.]
;B[nq]BL[1706.439]
;W[po]WL[1734.09]
;B[oo]BL[1682.599]
;W[np]WL[1730.089]
;B[sm]BL[1660.199]
;W[ro]WL[1725.471]
;B[so]BL[1657.037]
;W[rl]WL[1643.369]
;B[rm]BL[1608.861]
;W[qm]WL[1588.25]
;B[sp]BL[1538.915]
;W[qo]WL[1560.38]
;B[jq]BL[1512.058]
(;W[cn]WL[1548.886]
(;B[bq]BL[1485.013]LB[cj:B][dj:B][ck:B][dk:B][cl:B][dl:B][dn:D][bo:C][co:C][bp:C][cp:C][fp:A][fq:A][gq:A]TR[cn]C[This is a strange move.

That is a polite way to say it is bad. :-)

There are basically 4 choices to answer White's move.
A. Make the black area stronger. This is the normal answer.
B. Pincer.
C. Defend the corner territory, and make it hard for the white stone to make eyes.
D. Attach on top. Special purpose move.

This move is like C, but the corner is smaller than it needs to be. Any of the C moves would be better.

But, in this case, C is a bad plan. Black is too weak, White can invade near A, and then Black has no territory. Also, White can extend up the side, so White is not weak and taking the corner territory does not attack the white stone. 

In a 9-stone handicap game, when Black is very strong, then C is a good plan.

In this game, I would choose plan A or B.]
;W[dj]WL[1539.985]
;B[rk]BL[1470.101]
;W[sq]WL[1528.8]
;B[mp]BL[1458.791]
;W[no]WL[1523.901]
;B[mo]BL[1444.833]
;W[sn]WL[1517.851]
;B[nn]BL[1441.969]
;W[on]WL[1516.331]
;B[fc]BL[1414.719]C[Good.]
;W[df]WL[1512.02]C[As you can see, White chooses plan A, which I said before was the normal move. This is good.]
(;B[dc]BL[1399.939]C[This is a bit unusual. See the variation.]
;W[cc]WL[1507.768]
;B[db]BL[1395.992]
;W[cb]WL[1506.473]
;B[ed]BL[1352.844]
;W[de]WL[1502.572]C[Compared to starting with the knight's move slide into the corner, White's territory is bigger. If Black wants to play somewhere else, better to leave the option of invading at the 3-3 point.]
;B[dl]BL[1328.739]TR[dk][cl][dm]C[This is probably the wrong invasion. Normally, with this 3-space extension one of the marked points is right. If you look from the side of the board, the good moves form a 'V' shape.

The move on the third line is most common, and it makes it difficult for White to connect.]
;W[cl]WL[1499.372]C[Now, there White is connected, whatever Black does.]
;B[fg]BL[1296.255]C[Good. This expands the huge moyo in the top right area of the board.]
;W[qf]WL[1485.953]
;B[re]BL[1251.313]TR[kc][qk][rk]C[Good!

This is a good time to choose plan C, because the marked stone at the top is quite close, and the marked stones on the right gives Black a chance to attack the white stone.

Black must be careful that the marked stones on the right do not become a weak group.]
;W[rf]WL[1478.216]
(;B[ph]BL[1247.946]
;W[of]WL[1476.246]
;B[pf]BL[1239.4]C[This is bad:

1. It does not work. By the time you have discovered that it does not work, White had become stronger.

2. When your opponent has a weak group without eyes, it is normally bad to cut it in half, even if that works. When you cut the group in half, your opponent can often skillfully sacrifice one half of the group to make the other half live. Better to leave you opponent with one big, connected group with no eyes, and capture the whole lot!]
;W[pe]WL[1472.679]
;B[qe]BL[1196.621]
;W[pg]WL[1469.433]
;B[oe]BL[1194.378]
;W[pf]WL[1464.675]
(;B[qc]BL[1174.982]
;W[ne]WL[1461.535]
;B[od]BL[1172.475]
;W[nd]WL[1460.25]
;B[nf]BL[1166.934]C[Good cut! White's last move was a mistake.]
;W[ng]WL[1458.935]
;B[mf]BL[1164.45]
;W[mg]WL[1455.947]
;B[lg]BL[1150.932]LB[lf:A]C[This is quite brave! Coming out straight at M14 (A) is probably OK, but this is better (if Black doesn't make a mistake).]
;W[lf]WL[1451.064]
;B[me]BL[1148.03]
;W[lh]WL[1448.045]
;B[kg]BL[1145.484]
;W[kh]WL[1446.567]
;B[oh]BL[1132.371]
;W[og]WL[1444.192]
;B[mh]BL[1125.156]
;W[nh]WL[1442.582]
;B[mi]BL[1123.733]
;W[ni]WL[1439.965]
;B[ok]BL[1109.669]LB[jg:B][mj:A]C[This is very dangerous. I think Black should play A or B. The group on the side is going to get captured. Trying to save it will just make the sacrifice bigger.]
;W[pi]WL[1430.469]LB[nk:A]C[Oh. Not good. I think white should play at A. That threatens to capture the two black stones in the middle, or the group on the edge.]
;B[qh]BL[1102.254]
;W[qi]WL[1424.091]
;B[rh]BL[1096.302]
;W[ri]WL[1416.314]
;B[oi]BL[1011.005]
;W[oj]WL[1411.452]
(;B[nj]BL[998.082]C[MH: Wrong side on which to cut.  See variation. ]
;W[pj]WL[1384.271]
;B[mj]BL[988.17]
(;W[sh]WL[1375.989]C[Wrong move by White. See the variation.]
;B[sg]BL[980.244]
;W[sf]WL[1337.476]
;B[si]BL[974.261]
;W[sj]WL[1302.738]
;B[rj]BL[879.622]
;W[sh]WL[1299.394]
;B[ch]BL[852.738]C[Good ko threat.]
;W[rg]WL[1297.214]
;B[dh]BL[841.039]LB[eh:A]C[A might be better shape.]
;W[dk]WL[1284.249]
;B[el]BL[834.858]
;W[fj]WL[1277.574]
;B[ii]BL[800.018]
;W[co]WL[1255.765]
;B[en]BL[788.832]C[Good.]
;W[cp]WL[1253.871]
;B[cq]BL[787.082]
;W[do]WL[1251.148]
;B[eo]BL[783.512]
;W[hk]WL[1236.324]
;B[gk]BL[774.533]
;W[gj]WL[1232.542]
;B[hj]BL[773.81]C[Good cut. It is a bit risky, but Black ends up with the whole bottom area as territory.]
;W[gh]WL[1208.703]
;B[ig]BL[693.615]
;W[eg]WL[1190.452]
;B[fh]BL[650.095]
;W[eh]WL[1186.148]
;B[gi]BL[648.744]C[Good decision. Black sacrifices two stones so that he can keep all the central territory, and the black territory is bigger.]
;W[fi]WL[1183.977]
;B[hi]BL[636.512]
(;W[di]WL[1180.009]C[This is no good for White. He must try something more ambitious, like the variation.]
;B[bf]BL[616.876]C[There is no hope for the black stones. He shold save moves like this as ko threats.]
;W[bd]WL[1170.374]
;B[bj]BL[608.281]
;W[bk]WL[1165.816]
;B[ci]BL[595.435]
;W[bh]WL[1153.383]
;B[cg]BL[542.564]
;W[bi]WL[1137.653]
;B[an]BL[519.854]LB[ff:A]C[This is quite a big move, but A is much bigger.]
;W[bn]WL[1115.275]
;B[ao]BL[510.964]
;W[bm]WL[1110.942]
;B[nm]BL[456.442]LB[ff:A]C[A is still bigger.]
;W[pk]WL[1072.584]
;B[pl]BL[423.918]
;W[ql]WL[1051.379]
;B[om]BL[409.024]LB[ff:A]C[A is still bigger.]
;W[gq]WL[1031.521]C[This move does not work. White can probably see that he is behind, and so needs to try something to catch up.]
;B[eq]BL[378.368]C[Good.]
;W[fk]WL[1025.959]
;B[gl]BL[361.392]
;W[fl]WL[1024.022]
;B[fm]BL[354.448]
;W[ff]WL[999.925]C[At last!]
;B[gg]BL[335.15]
;W[gf]WL[995.597]
;B[hg]BL[332.835]
;W[hd]WL[991.079]
;B[he]BL[316.828]
(;W[ge]WL[982.18]
;B[gd]BL[314.713]C[Good cut! (But see the variation. I think Black was lucky.)]
;W[hf]WL[980.086]
;B[ie]BL[313.671]
;W[if]WL[977.551]
;B[jf]BL[311.695]
;W[id]WL[954.599]
;B[je]BL[309.163]
(;W[jd]WL[938.01]C[Not the best move for White; see variation.]
;B[kd]BL[301.157]
;W[gc]WL[934.103]
;B[fd]BL[297.352]
;W[gb]WL[928.244]
;B[jc]BL[275.101]
;W[hc]WL[916.535]
;B[fb]BL[270.998]C[Black 4 liberties, White 3 liberties; now Black is safe.]
;W[ib]WL[911.302]
;B[ic]BL[263.626]
;W[da]WL[893.665]
;B[ga]BL[236.894]
;W[lq]WL[880.757]C[White is now clearly losing, and must try to trick Black to win.

I am really impressed by how well Black defends here. It would be very easy to make a mistake and let White get something.]
;B[mq]BL[218.288]
;W[kp]WL[876.546]
;B[jp]BL[213.565]
;W[ko]WL[874.46]
;B[ln]BL[206.827]
;W[hl]WL[870.271]
;B[gm]BL[204.288]
;W[in]WL[863.688]
;B[jo]BL[179.881]
;W[jn]WL[854.093]
;B[kn]BL[173.332]
;W[hm]WL[838.129]
;B[ho]BL[156.912]
;W[io]WL[834.301]
;B[ip]BL[154.348]
;W[hp]WL[831.458]
;B[kq]BL[138.822]
;W[go]WL[824.089]
;B[gn]BL[135.903]
;W[hn]WL[822.455]
;B[fo]BL[134.326]
;W[iq]WL[813.775]
;B[ir]BL[129.271]
;W[hr]WL[810.862]
;B[jr]BL[72.707]
;W[fp]WL[799.873]
;B[fq]BL[64.557]
;W[fr]WL[791.679]
;B[er]BL[49.588]
;W[gs]WL[788.335]LB[im:B][gr:A]C[Now, White has one eye at A if he wins the ko, and possibly one eye at B if he plays there first. That is not enough; White should die.]
;B[hq]BL[42.504]
;W[em]WL[723.452]
;B[dm]BL[35.674]
;W[iq]WL[720.418]
;B[fe]BL[0.418]
;W[hq]WL[713.122]LB[kl:A]C[Still not two eyes, as Black is about to show.

White should play at A to make one eye there, and continue to fight the ko.

Actually, even A may not make an eye in the middle.]
(;B[jl]BL[30]OB[5]C[Good. Now White is clearly dead.]
;W[jk]WL[688.076]
;B[il]BL[30]OB[5]LB[kl:A]C[A bit risky. A is probably safer.]
;W[ik]WL[682.718]
;B[kl]BL[30]OB[5]
;W[nk]WL[626.353]
;B[mk]BL[30]OB[5]C[Good. No need to take risks.]
;W[ol]WL[622.022]
;B[ef]BL[30]OB[5]
;W[ml]WL[608.941]
;B[nl]BL[30]OB[5]
;W[ok]WL[576.245]
;B[ll]BL[30]OB[5]
;W[or]WL[463.615]
;B[nr]BL[30]OB[5]
;W[pr]WL[461.891]
;B[ea]BL[30]OB[5]
;W[ca]WL[457.712]
;B[dg]BL[30]OB[5]C[This does not work, but no harm in trying (other than it wastes ko threats).]
;W[ei]WL[451.073]
;B[ce]BL[30]OB[5]
;W[cd]WL[444.592]
;B[ae]BL[30]OB[5]
;W[be]WL[432.938]
;B[ai]BL[30]OB[5]
;W[cj]WL[425.298]
;B[am]BL[30]OB[5]
;W[al]WL[419.508]
;B[pm]BL[30]OB[5]LB[bp:A]C[Oops! Black must play A.]
;W[ap]WL[414.829]C[Good.]
;B[bp]BL[30]OB[5]
;W[bo]WL[413.632]
;B[aq]BL[30]OB[5]
;W[dn]WL[392.347]
;B[ep]BL[30]OB[5]
;W[se]WL[354.24]
;B[rd]BL[30]OB[5]
;W[nc]WL[334.766]
;B[ob]BL[30]OB[5]C[White is trying more rubbish. Black still defends accurately.]
;W[oc]WL[325.869]
;B[pc]BL[30]OB[5]
;W[rb]WL[318.495]
;B[rc]BL[30]OB[5]
;W[nb]WL[308.127]
;B[qb]BL[30]OB[5]
;W[oa]WL[293.745]
;B[pb]BL[30]OB[5]
;W[md]WL[286.275]
;B[le]BL[30]OB[5]
;W[ld]WL[256.75]
;B[ke]BL[30]OB[5]
;W[lc]WL[255.019]
;B[lb]BL[30]OB[5]
;W[mb]WL[243.818]
;B[ka]BL[30]OB[5]
;W[sb]WL[160.8]
;B[pa]BL[30]OB[5]
;W[ra]WL[126.403]
;B[sd]BL[30]OB[5]
;W[ns]WL[7.775]
;B[ms]BL[30]OB[5]
;W[os]WL[6.526]
;B[pn]BL[30]OB[5]
;W[oo]WL[0.925]
;B[ee]BL[30]OB[5]
;W[cf]WL[30]OW[5]
;B[]BL[30]OB[5]
;W[]WL[30]OW[5]TR[gd][he][hj][gk]TW[aa][ba][ab][bb][ac][bc][ad][ae][ce][af][bf][ag][bg][cg][dg][qg][sg][ah][ch][dh][oh][ph][qh][rh][ai][ci][oi][si][aj][bj][qj][rj][ak][ck][qk][rk][sk][bl][sl][am][rm][sm][an][rn][so][pp][qp][rp][sp][qr][rr][sr][ps][qs][rs][ss]TB[fa][ha][ia][ja][la][ma][na][oa][qa][ra][sa][eb][gb][hb][ib][jb][kb][mb][nb][rb][sb][ec][gc][hc][lc][mc][nc][oc][sc][hd][id][jd][ld][md][nd][qd][ge][ne][ff][gf][hf][if][kf][lf][jg][gh][hh][ih][jh][kh][lh][ji][ki][li][ij][jj][kj][lj][hk][ik][jk][kk][lk][hl][ml][hm][im][jm][km][lm][mm][fn][hn][in][jn][mn][go][ho][io][ko][lo][fp][gp][hp][kp][lp][dq][gq][hq][iq][lq][ar][br][cr][dr][fr][gr][hr][kr][lr][mr][as][bs][cs][ds][es][fs][gs][hs][is][js][ks][ls]C[
Let me try to summarise the key points:

1. When you have a stone on the 4-4 point, and your opponent approaches, you need to choose one of the 4 plans:

A. Solidify yourself on the other side.
B. Play a pincer.
C. Defend the corner territory in order to attack the approach stone.
D. Attach on top of the approach stone.

Which choice is best depends on the surrounding position. Sometimes one choice is definitely the best.  In other positions, several choices are equally good, and you can play the one that matches your natural style of Go-playing. Sometimes it is really hard to choose the right move, even for dan players.

In this game, there are four different examples of an approach to a 4-4 stone, one in each corner, 
so this game is a good one to use to study this question.

2. Try not to make joseki mistakes, like in the bottom right corner. However, this game shows that even if you make a mistake in one corner, you can still win the game if you don't panic.

3. When you are ahead, your opponent will try all sorts of crazy things to catch up, 
and you have to defend really carefully. I was very impressed by how Black defended against all the tricky moves that White tried.

4. I was also impressed by the two cutting sequences (marked) that Back played to stop White getting into his territories (even if the one at the top was a bit too dangerous!)])
(;B[ef]C[What if Black is greedy?

(Black is already winning, so being greedy would be bad strategy. It would just give White a chance he does not deserve, but this is an interesting position to study.)]
(;W[jl]C[This does not work.]
;B[jm]
;W[im]
;B[km]
(;W[ik]
;B[jk])
(;W[jk]
;B[ik]
;W[jj]
;B[ij]
;W[nk]
(;B[ol]
;W[mk]
;B[lj]
;W[lk]C[Oops!])
(;B[mk]C[Give up the unimportant stone.])))
(;W[kl]C[This move is harder to answer, but I think it still does not make an eye.]
;B[jl]
(;W[jk]
;B[il]
;W[jm]
;B[kk]
;W[ik]
;B[km]
;W[ll]
;B[lk]
;W[nk]
;B[ml])
(;W[kk]
;B[jm]
;W[km]
;B[jk]
;W[jj]
;B[kj]
;W[lj]
;B[ij]
;W[ki]
;B[ik]
;W[nk]
;B[mk]))))
(;W[gc]
;B[fd]
;W[gb]
;B[fb]
;W[hc]C[This looks like a complex fight. About four liberties each, with Black to play next, so he might be OK, but there are many difficult variations to read out.]))
(;W[gd]
;B[ge]
;W[fe]
;B[fd]
;W[ie]
;B[hf]
;W[gb]C[Black needs to worry about what happens if White plays like this.]
;B[gc]
;W[hc]
;B[fb]
;W[hb]
;B[ga]
;W[ha]
;B[fa]
;W[id]C[It looks like White has 6 liberties, and Black has 4. Oops!]))
(;W[ff]
;B[gg]
;W[gf]
;B[hg]
;W[gd]
;B[gc]
;W[hd]
;B[hc]
;W[jd]C[White should use forcing moves to get into Black's territory.]))
(;W[sg]C[This is the vital point, and it works here. I will let the reader analyse the variations.]))
(;B[pj]
;W[nj]
;B[si]C[Since the move in the game does not work (if white plays correctly) this would be better.]))
(;B[od]C[I think you can defend like this. It makes the territory at the top stronger.

If White tries to cut ...]
;W[qd]
;B[rd]
;W[qc]
;B[rc]
;W[qb]
;B[rb]
;W[ob]
;B[oc]
;W[pb]
;B[nb]C[It does not work. White has 4 liberties and Black has 5.]))
(;B[qe]
;W[pf]
;B[qh]C[I think I would attack like this.]))
(;B[db]
;W[cc]
;B[hd]C[This is more normal. Black builds a nice shape.])
(;B[pf]LB[db:B][cc:A]TR[kc]C[It is also possible to leave the top corner, since Black already has the marked stone. Later he can choose A or B.]))
(;B[mp]
;W[no]
;B[mo]
;W[nn]
;B[fp]C[Plan A looks nice for Black. (Playing the ataris first is probably best.)]))
(;W[mp]C[White should think about playing here. It is very big. (Threatens to capture two more stones.)]))
(;B[op]C[With the pincer stone in place, Black must come out with a straight strong wall.]
;W[rp]
;B[ro]
;W[rq]
;B[qo]
;W[nq]
;B[pn]C[This is the normal joseki. Black's wall is working well to make a big moyo on the right.]))
