(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[5.00]
PW[Diamond]PB[Muller]EV[EGC 1967]RO[2]PC[Cambridge]US[GoGoD95]C[Comments by Jon Diamond, 5 dan]RE[0]
;B[pd]
;W[do]
;B[pp]
;W[dc]
;B[de]
;W[ee]C[The joseki up to 12 is not seen very frequently nowadays.]
;B[ef]
;W[ed]
;B[dg]
;W[ce]
;B[cf]
;W[be]
;B[gf]C[Black's ponnuki is already very strong - this move only provokes white's territorial move 14.]
;W[hd]
;B[pj]
;W[nq]
;B[kp]
;W[no]
;B[pn]
;W[pr]
;B[qq]
;W[kr]
;B[mp]
;W[np]
;B[nm]
;W[nc]
;B[nd]
;W[md]
;B[ne]
;W[qc]
;B[qd]C[This is necessary. To plat at 33 instead would be contrary to the spirit of 15 and 25.]
;W[pc]
;B[oc]
;W[ob]
;B[od]
;W[mb]
;B[me]
;W[ld]
;B[le]
;W[nj]LB[mm:A]C[This invasion is too deep. Had white exchanged 62 for 63, and then played at 'A' the game would have been quite even.]
;B[dq]
;W[cq]
;B[dl]C[This is an excellant move, played on a very large scale. As well as its effect on the corner, it has implications towards the white stone at 40. ]
;W[dp]
;B[lm]C[White is at a loss as to how to extricate his stone, because his escape is blocked by 43.]
;W[pk]
;B[qk]
;W[qj]
;B[ok]
;W[pl]
;B[ql]
;W[pi]
;B[oj]
;W[oi]
;B[qi]
;W[rj]
;B[ri]
;W[qh]
;B[rh]
;W[mh]
;B[ol]
;W[ke]
;B[kf]
;W[kh]C[The sequence up to here sees white trying to reduce some of black's territory while making eye-shape for himself. However, 64 at 67 would give better shape for white.]
;B[li]
;W[mi]
;B[lj]
;W[lh]
;B[ih]C[Black is back on the attack again. If white escapes towards the centre, black will make territory on the left; if towards the upper side, black will destroy a large part of it.]
;W[pg]
;B[qg]
;W[ph]
;B[qf]
;W[jg]
;B[kd]
;W[je]
;B[jf]
;W[ig]
;B[if]
;W[hh]
;B[lc]
;W[mc]
;B[id]
;W[jd]C[Ill advised. Had white played 90, black could have captured two stones, but then white would have sente.]
;B[jc]
;W[kc]
;B[ie]
;W[kd]
;B[ij]C[A curious move. If played at 90, white would be left in real trouble.]
;W[ii]
;B[hi]
;W[jh]
;B[jj]
;W[gi]
;B[hj]
;W[gg]LB[ff:B]C[This move threatens the move at 'B'. With the sequence to 109, black secures central territory. However, his position still has a few defects.]
;B[lr]
;W[lq]
;B[kq]
;W[mr]
;B[jr]
;W[ls]
;B[eq]
;W[cr]
;B[fp]
;W[ir]
;B[jq]
;W[js]
;B[iq]
;W[gj]
;B[gk]
;W[ff]C[This cut is very painful for black as he has to go back and defend at 115, letting white play 116.]
;B[fg]
;W[fe]
;B[lg]
;W[di]
;B[ei]
;W[ej]
;B[dj]
;W[eh]C[A serious error. White at 121 would kill the 5 black stones.]
;B[ci]
;W[fi]
;B[cj]
;W[fn]C[Another oversight - if played at 150 instead there is still a chance to win.]
;B[cn]
;W[bo]
;B[co]
;W[cp]
;B[bn]
;W[ap]C[Necessary for the life of this group.]
;B[qr]C[With this move black establishes a clear lead of 10 to 15 points.]
;W[hr]
;B[gn]
;W[hq]
;B[hp]
;W[gm]
;B[hn]
;W[fo]
;B[gp]
;W[lp]
;B[ko]
;W[hc]
;B[ic]
;W[hl]
;B[gl]C[This move is a mistake, as white 146 shows. He should have played at 147 and then to the right of 144, to keep most of his territory.]
;W[dm]
;B[hm]
;W[bl]
;B[cl]
;W[cm]
;B[bk]
;W[bm]C[Now white is only about five points behind.]
;B[rc]C[160 is the largest ysoe point at this stage of the game.]
;W[rb]
;B[qb]
;W[pb]
;B[sb]
;W[ra]
;B[rd]
;W[or]
;B[hb]
;W[gb]
;B[ib]
;W[ga]
;B[bf]
;W[dd]
;B[af]
;W[ae]
;B[df]
;W[ln]
;B[kn]
;W[eg]
;B[dh]
;W[hf]
;B[he]
;W[ge]
;B[ei]
;W[fh]
;B[lo]C[Better at 180.]
;W[mo]
;B[ek]
;W[fm]C[Although worth five points, a better sequence would have been white 183, black 182, and then hane to the right of 185.]
;B[kb]
;W[lb]
;B[ps]
;W[fl]
;B[fk]
;W[fr]C[White is now only a couple of points behind, but he catches up in the last 60 moves to record a jigo. His better yose saved an almost certain defeat.]
;B[es]
;W[fs]
;B[ds]
;W[ep]
;B[fq]
;W[cs]
;B[mn]
;W[mk]
;B[lk]
;W[ml]
;B[la]
;W[ma]
;B[ka]
;W[ll]
;B[kl]
;W[di]
;B[gq]
;W[gr]
;B[ei]
;W[mf]
;B[lf]
;W[di]
;B[el]
;W[go]
;B[ho]
;W[pf]
;B[of]
;W[mg]
;B[pe]
;W[on]
;B[oo]
;W[op]
;B[po]
;W[nn]
;B[mm]
;W[om]
;B[pm]
;W[os]
;B[qs]
;W[og]
;B[mj]
;W[nk]
;B[em]
;W[en]
;B[ei]
;W[rg]
;B[rf]
;W[di]
;B[cd]
;W[bd]
;B[ei]
;W[fj]
;B[nf]
;W[ki]
;B[al]
;W[am]
;B[ak]
;W[kj]
;B[kk]
;W[ha]
;B[ia]
;W[gc]
;B[ng]
;W[nh]
;B[pq]
;W[ji]
;B[di])
