(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]
PW[Korea - Song Ye-Seul and Seo Yu-Tae]PB[China - Ling Yan and Lin Long]PC[17th International Amateur Pair Go Champiomnship]RE[W+Resign]
;B[pd]
;W[dp]
;B[pq]
;W[dd]
;B[fq]
(;W[hq]LB[dn:B][hq:A]C[6 stops B playing the Kobayashi opening as in the variation for 5.]
;B[cq]
;W[dq]
;B[cp]
;W[do]
;B[dr]
;W[er]
;B[cr]
;W[eq]
;B[cn]
;W[qo]
;B[op]
(;W[lp]LB[qk:B][lp:A]C[18 is a good move, that makes good balance with 6 and the diagonal move at 17.

See the diagram for a variation at 18.]
;B[pn]
;W[qm]
;B[rp]LB[qp:A]C[21 is strange shape - at A may be slightly better.]
;W[pm]C[22 may be slightly slow, but it's thick.]
;B[qg]
;W[jc]
;B[cf]
;W[fd]
;B[bd]
;W[qc]
;B[pc]
;W[qd]
;B[qb]
(;W[qf]LB[rb:B][qf:A]C[32 is a tesuji. See the diagram for why white doesn't first exchange 34 for 35.]
;B[pg]
;W[rb]
;B[pb]
;W[pf]
;B[of]
;W[rg]
;B[rh]
;W[rf]
;B[og]
;W[ri]
;B[qi]C[43 is prudent - black could descend, but it leads to some tricky fights.]
;W[sh]
;B[qh]
;W[rj]
;B[lc]
;W[cc]
;B[ci]
;W[em]
;B[jq]
;W[jp]
;B[kq]
;W[kp]
;B[fr]
;W[fp]
;B[iq]
;W[ip]
;B[hr]
;W[gq]C[Black had a big choice at 61. The variation is an improvement on the game.]
(;B[gr]LB[lq:B][gr:A]
;W[lq]
;B[es]
;W[kr]
;B[jr]
;W[js]
;B[ir]
;W[je]C[White gets a lot of thickness in the game, and the cut at 75 can be captures.]
;B[on]
;W[qn]
;B[nq]
;W[cm]
;B[bn]
;W[le]C[74 aims at cutting of the black group including 29 later.]
;B[gp]
;W[hp]
;B[go]
;W[fo]C[78 captures black. I'll leave the variations as an exercise for the reader!]
;B[qj]
;W[rk]LB[bc:A]
;B[bc]LB[jb:A]C[It may be better to paly at A with this move, protecting black's big group.]
;W[md]
;B[mc]
;W[oe]
;B[nk]C[85 is small - it's bigger to protect the other group (which includes the stone at 83).]
;W[kb]C[B is in trouble.]
;B[ra]
;W[rc]
;B[ne]
;W[nd]
;B[lb]
;W[od]
;B[hn]
;W[gn]
;B[nb]
;W[oc]
;B[ob]
;W[ma]
;B[jd]
;W[kd]
;B[la]
;W[qa]
;B[kc]
;W[jb]
;B[id]
;W[hc]
;B[ho]
;W[im]C[108 captures black. So it's one solution to the exercise for readers!]
;B[ld]
;W[ke]C[Black is dead on the upper side, so resigns.])
(;B[lq]LB[hc:A][lq:B][gr:B]C[This move makes miai of A and B. If black gets B in, he activates some cuts in white's position.]))
(;W[rb]LB[rb:B][qf:A]
;B[pb]
;W[qf]
;B[pf]
;W[pe]
;B[oe]
;W[qe]
;B[rg]C[This is bad for white. Without the 32-33 exchange in this variation, white could atari their way out.]))
(;W[qk]LB[qk:B][lp:A]
;B[jq]C[19 is painful for white.]
;W[qf]
;B[fp]
;W[fr]
;B[hp]
;W[iq]
;B[ip]
;W[jr]
;B[kr]
;W[ir]
;B[kq]C[This is good for black - white doesn't yet have two eyes. So 18 in the game was wise.]))
(;W[dn]LB[dn:B][hq:A]
;B[jp]
;W[po]
;B[pl]
;W[no]
;B[nq]
;W[lo]
;B[mp]
;W[mo]
;B[pi]C[White 6 lets black make the extension to 7. White then has a difficult choice for his next move. If he plays a high approach, as here, black gets a position on both sides.

Pros think this is good for black, and so now avoid this.

Kobayashi Koicihi, 9 dan, popularised this opening in the 1980s.]))
