(;GM[1]
FF[4]
SZ[19]
RU[japanese]
ST[2]
C[Copyright British Go Association 1986, 1999

]
SO[BGJ 67, April 1986, Page 27]
RE[B+Resign]
KM[6]
PW[Ronald Schlemper]
PB[Yong-Su Yoo]
;B[pd]
;W[dc]
;B[pp]
;W[co]
;B[de]
;W[ce]
;B[dd]
;W[cd]
;B[ec]
;W[cf]
C[White 10 starts the"Large Avalanche", a very complicated
joseki. White 10' at 11(A) leads to the "Small Avalanche".
]
LB[df:A];B[df]
;W[dg]
;B[cc]
;W[db]
;B[bc]
;W[bb]
(;B[cg]
C[Black 17: If at 34(A), white turns at 33(B). If black then captures 16,
white gives atari at C and black gets a tiny corner and a
weak centre group.
]
LB[cb:A][eb:B][bb:16][fc:C];W[bd]
;B[ch]
;W[dh]
C[White 20 is an old move, either 34(A) or 33(B) are more common nowadays.
]
LB[cb:A][eb:B](;B[ci]
C[Black 21: If at 22(A), White plays one point above 26(B), and black
cannot defend against both 24(C) and 21.
]
LB[di:A][fg:B][fe:C];W[di]
;B[dj]
;W[fe]
C[White 24: The vital point, forcing black to make an empty triangle
(connecting would be far too passive). This stone becomes a sacrifice to
surround black.
]
;B[ef]
;W[fh]
;B[ff]
;W[gf]
;B[ge]
;W[hf]
;B[gd]
;W[id]
(;B[eb]
C[Black 33: A mistake, better is 1 in the variation.
]
LB[hc:A];W[cb]
;B[ck]
C[Black 35: Before 33, A was black's sente, and if white cuts at 37(B),
black captures him by playing 35. After 34 black must defend the cut,
but better is to play 5 and 7 from the variation to move 33.
]
LB[bf:A][cj:B];W[bj]
C[White 36 attacks black's eye space. If black descends to 42(A),
white's hane at B would be sente.

]
LB[bk:A][ej:B];B[cj]
;W[cm]
;B[fj]
;W[hh]
;B[pj]
C[Black 41 & 43: Black coolly leaves his group for white to
attack. The game will depend on how well White exploits it.
]
;W[bk]
;B[jp]
;W[hj]
;B[em]
;W[eo]
;B[cl]
;W[bl]
;B[dm]
(;W[cn]
C[White 50: An oversight. Better to play at C.
White wants to keep black's group weak. But after 50, black 1(A) in the variation makes an eye.

]
LB[bn:C][bf:A](;B[fd]
C[Black 51: A mistake. Black is not worried
about his group, which is alive anyway (check it yourself), but is
aiming at 1 in the variation. However this move is too
slow. Better is 58(E) or D.

]
LB[nc:E][fq:D];W[gp]
;B[nq]
C[Black 53: Again slow. Better is to probe at E. It seems unlikely
white can hope to kill the intruder. After 54 and 56 white encloses a
very large corner.
]
LB[eq:E];W[iq]
;B[jq]
;W[ip]
;B[jo]
;W[nc]
;B[pf]
;W[hc]
;B[gc]
;W[gb]
;B[fb]
;W[pb]
;B[qc]
;W[ne]
C[White 66: Makes miai of 67 and 68. At this stage White was
confident of winning.
]
TR[ng][ro];B[ng]
;W[ro]
;B[qp]
;W[ql]
;B[rk]
;W[qk]
;B[qj]
;W[rl]
;B[rj]
;W[ol]
;B[rp]
;W[nk]
;B[lk]
;W[ni]
(;B[mj]
C[Black 81-83: Too direct. Black has no strong attack on white's
group. A better idea is to peep at F, white connects, then black 88.
]
LB[md:F];W[nj]
;B[lh]
;W[oh]
;B[pg]
;W[mh]
;B[mg]
;W[lg]
;B[nf]
(;W[kg]
C[White 90: Simpler to play at 107(A), when the top becomes white
territory.
]
LB[lf:A];B[mi]
;W[nh]
;B[kh]
;W[ll]
;B[kl]
(;W[lm]
C[White 96: If white cuts at 1(A) in the variation, black seems 
to be in trouble.
]
LB[kk:A];B[jk]
;W[mk]
;B[lj]
;W[on]
(;B[le]
C[Black 101-103 builds thickness. But first Black should play at 114(A).
If white blocks, black connects in sente, otherwise the bad cutting aji
enables black to live in white's corner. (How? - the details are left as
a problem for kyu players.)
]
LB[ir:A];W[lc]
;B[jg]
;W[jf]
;B[kf]
;W[ig]
;B[lf]
;W[fi]
;B[gj]
;W[gi]
;B[hk]
;W[jr]
C[White 112 and 114 are enormous (count just
how much) and put white into the lead.
]
;B[kr]
;W[ir]
;B[mn]
;W[mm]
;B[nn]
;W[nm]
;B[je]
;W[ib]
;B[qb]
;W[ph]
;B[qh]
;W[oo]
;B[kc]
;W[kd]
;B[ld]
;W[kb]
;B[mc]
;W[lb]
;B[nb]
;W[mb]
;B[ob]
;W[oc]
;B[pc]
;W[na]
;B[pa]
;W[md]
;B[lq]
;W[op]
;B[oq]
;W[sp]
;B[sq]
;W[so]
;B[rq]
;W[ij]
;B[if]
;W[ik]
;B[hl]
;W[il]
;B[hm]
;W[fn]
;B[ho]
;W[go]
;B[qo]
;W[rn]
;B[qn]
;W[qm]
;B[ga]
;W[fm]
;B[fl]
;W[lo]
C[White 162: A losing blunder when ahead by 4 or 5 points. Black 163
becomes sente, and enables him to start a ko that white dare not lose.
As a result black lives in white's corner and takes a large lead.
]
;B[kn]
;W[ln]
;B[he]
;W[im]
C[White resigns after 233.
]
;B[in]
;W[km]
;B[jm]
;W[jl]
;B[kk]
;W[jn]
;B[eq]
;W[cq]
;B[jm]
;W[fg]
;B[ih]
;W[jn]
;B[cr]
;W[ko]
;B[gq]
;W[fr]
;B[fq]
;W[io]
;B[bq]
;W[dq]
;B[dr]
;W[bp]
;B[aq]
;W[gr]
;B[bs]
;W[er]
;B[hg]
;W[ds]
;B[ar]
;W[gm]
;B[gl]
;W[es]
;B[cs]
;W[bg]
;B[hn]
;W[lp]
;B[kq]
;W[hp]
;B[ej]
;W[gg]
;B[bh]
;W[bf]
;B[ii]
;W[hi]
;B[jj]
;W[mp]
;B[mq]
;W[jd]
;B[hb]
;W[pi]
;B[qi]
;W[od]
;B[oe]
;W[me]
;B[np]
;W[no]
;B[ap]
;W[ao]
;B[aj]
;W[ai]
;B[bi]
;W[ak]
;B[an]
;W[bo]
;B[bm]
;W[bn]
;B[dp]
)(;B[ir]
C[[This sequence was not in BGJ]
]
;W[hr]
;B[jr]
;W[gq]
;B[le]
))(;W[kk]
;B[kj]
;W[jk]
;B[ml]
;W[lm]
;B[mk]
;W[mm]
))(;W[lf]
))(;B[md]
;W[nd]
;B[lg]
))(;B[fd]
;W[ss]
C[
]
(;B[eh]
)(;B[eh]
;W[eg]
;B[fg]
;W[ei]
;B[gh]
LB[eg:2][fg:3][ei:4][gh:5][fd:1][ss:2][pd:1][dc:2][pp:3][co:4][de:5][ce:6][dd:7][cd:8][ec:9][cf:10][df:11][dg:12][cc:13][db:14][bc:15][bb:16][cg:17][bd:18][ch:19][dh:20][ci:21][di:22][dj:23][fe:24][ef:25][fh:26][ff:27][gf:28][ge:29][hf:30][gd:31][id:32][eb:33][cb:34][ck:35][bj:36][cj:37][cm:38][fj:39][hh:40][pj:41][bk:42][jp:43][hj:44][em:45][eo:46][cl:47][bl:48][dm:49][cn:50]TR[fd]LB[eh:A][eh:1])))(;W[cn]
(;B[bf]
C[Sub variation to make move nukbers the same as the BGJ article
]
)(;B[bf]
;W[ag]
;B[ah]
;W[bh]
;B[bi]
;W[ai]
;B[aj]
;W[ak]
;B[bg]
C[If white 2, black exploits the cutting point at A with the throw ins at 3 & 7.
]
LB[bf:1][ag:2][bh:4][bi:5][ai:6][ak:8][bg:9][cn:1][pd:1][dc:2][pp:3][co:4][de:5][ce:6][dd:7][cd:8][ec:9][cf:10][df:11][dg:12][cc:13][db:14][bc:15][bb:16][cg:17][bd:18][ch:19][dh:20][ci:21][di:22][dj:23][fe:24][ef:25][fh:26][ff:27][gf:28][ge:29][hf:30][gd:31][id:32][eb:33][cb:34][ck:35][bj:36][cj:37][cm:38][fj:39][hh:40][pj:41][bk:42][jp:43][hj:44][em:45][eo:46][cl:47][bl:48][dm:49][bm:A][ah:3][aj:7])))(;B[hc]
;W[ic]
;B[eb]
;W[cb]
;B[ej]
;W[fg]
;B[cl]
C[The exchange of 1 for 2 is useful, then 5 and 7 make good
shape. (5 threatens to wedge in at A, forcing white 6).
]
LB[eh:A][hc:1][ic:2][eb:3][cb:4][ej:5][fg:6][cl:7][pd:1][dc:2][pp:3][co:4][de:5][ce:6][dd:7][cd:8][ec:9][cf:10][df:11][dg:12][cc:13][db:14][bc:15][bb:16][cg:17][bd:18][ch:19][dh:20][ci:21][di:22][dj:23][fe:24][ef:25][fh:26][ff:27][gf:28][ge:29][hf:30][gd:31][id:32]))(;B[di]
;W[fg]
TR[fe][ci]))(;B[cb]
;W[eb]
;B[ab]
;W[fc]
;B[ba]
;W[ed]
))