(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[White]PB[Black]
;B[pd]
;W[qf]
;AW[nc][qi]AB[qk]
;B[nd]
;W[md]
;B[ne]
;W[qc]
;B[oc]
;W[mc]TR[qi]C[Since white has the triangled stone in place, this connection makes sense.]
;B[qd]
;W[rd]LB[mb:D][nb:C][rb:B][re:A]C[The move at A may seem natural, but actually this has never been joseki, not even an obsolete one.  See the variation.

B is what you will see in 19th century games, and is listed in Ishida Joseki dictionary (see variation).   However this move is now obsolete.  It may even be that some of our younger readers may not have seen this move.  Now, you will almost always see black C, which of course if answered at D would make A work for black.  So white will answer at B, and then see the continuation.]
(;B[nb]
;W[rb]
;B[mb]LB[kc:A][kd:B]C[White can think about A and B now.  However, if white plays A  black gets a thick position he will be happy with(see variation).  So B is the normal move.]
(;W[kd]LB[kc:B][qc:C][dd:A]C[The result in this position depends on whether a stone around A is black or white.  If it is black then the result here is not good for white.  The black move at B will work well. In this case the original triangled invasion of the corner at C is not good, the result here would not be considered joseki.  See the continuation after B assuming white owns the upper left corner.]
;B[kc]LB[jc:A]C[A here will be a mstake (see the variation).]
(;W[jd]
;B[jc]
;W[ic]
;B[id]
;W[hc]
;B[ie]
;W[kf]LB[ic:B][dd:A]C[If white has a stone at A this fight looks reasonable for him. If not B will have been an overplay, and if white cannot play B this result is not good for him.])
(;W[jc]
;B[lc]LB[jd:A][ld:B]C[White cannot protect both A & B.]))
(;W[kc]
;B[kd]
;W[jd]
;B[lc]
;W[ld]
;B[ke]
;W[lb]
;B[le]LB[jc:A][me:B]TR[mc][nc][ld][md]C[White needs to protect the cut at A, so black will get very thick with the atari at B, and in sente assuming white rescues the four triangled stones.  This is not good enough for white normally.]))
(;B[re]
;W[rc]
;B[qe]
;W[ob]
;B[pc]
;W[pb]C[White's territory is large, and black only has a floating group, this has never been considerd joseki.])
(;B[rb]
;W[rc]
;B[qb]
;W[me]
;B[nf]
;W[id]LB[ob:A][pc:B]C[White cannot cut with A now as B will threaten the 3 stones.  However as moves like A & B are all sente for white threatening A white's group on the right is very solid, as it the group at the top.  With white having created stable groups on both sides this result is good for him.]))
