(;CA[Windows-1252]SZ[19]AP[MultiGo:4.4.4]MULTIGOGM[1] ;B[pd];W[qf];B[qh];W[nc]LB[pf:A][nd:B][oe:C]C[ 'a' is joseki. 'b' is rare. 'c' is not recommended,] (;B[pf]LB[qc:A][pg:B][pc:C]C['a' is joseki. 'b' too but can be difficult. 'c' is disadvantageous.] (;W[qc]LB[qd:A][pc:B]C['a' is joseki. 'b' can be unfavorable.] (;B[qd];W[pc];B[od]LB[rc:A][oc:B][rd:C]C['a' or 'b'. 'c' is a mistake.] (;W[rd]LB[rc:A][re:B] (;B[rc]LB[rb:A][re:B]C['a' or 'b' give the same result.] (;W[rb];B[oc];W[ob];B[pb];W[qb];B[nb];W[pa];B[mc];W[re]C[good for black]) (;W[re];B[oc];W[ob];B[nb];W[pb];B[mc];W[rb])) (;B[re];W[rc]C[Good for White])) (;W[oc]) (;W[rc] (;B[dp];W[rd];B[qg]) (;B[rd]C[* Joseki *];W[dp];B[lc]LB[mc:A][nb:B] (;W[nb]) (;W[mc];B[ld];W[pp];B[sc]C[Later, Black can use the aji.];W[sb]C[White must not answer here.] ;B[oc];W[ob];B[nb])))) (;B[pc]LB[qd:A][pg:B] (;W[qd]LB[pe:A][qe:B]C[Black 7 is especially good with an additional stone on the triangled point. 'a' is usual. 'b' is complicated.] (;B[pe]LB[rf:A][pb:B][qe:C] (;W[rf];B[pb]LB[qb:A][qg:B] (;N[]) (;W[qg];B[pg];W[rh];B[qi];W[ri];B[qj];W[jd]C[Joseki])) (;N[]) (;N[])) (;N[]) (;N[])) (;N[]))) (;W[pg];B[qg]LB[pc:A][qc:B][pe:C] (;W[pe];B[of];W[oe];B[qe];W[qd];B[rf]) (;W[qc];B[pc];W[pe];B[of];W[oe];B[qe];W[qd];B[rf]LB[od:A][re:B]C['a' is enough, 'b' risks a ko.]) (;W[pc] (;B[qe];W[qc]LB[of:A][re:B]C['a' concludes the joseki, but is oftenly omitted for sente. Then White can later followup on 'b'.]) (;B[qc];W[pe];B[of];W[qd];B[od];W[oe];B[ne];W[qe];B[nd];W[nf];B[og];W[oc]LB[mc:A] [ld:B]C['a' and 'b' give the same result.] (;N[]) (;B[ld]LB[lc:A][rc:B] (;W[lc]LB[mc:A][rf:B][rc:C] (;B[mc];W[mb];B[md];W[rc];B[qb];W[rb];B[rf];W[re];B[se];W[rd];B[lb];W[na]LB[kc:A] [ph:B]C[With a position in the top left corner, Black takes on 'a', in the lower right corner, on 'b'.]) (;B[rf];W[rc];B[qb];W[re];B[se];W[rd];B[rb];W[rg];B[mc];W[mb];B[md];W[lb]LB[sg:A] [ng:B]C['a' or 'b'.] (;N[]) (;B[ng];W[rh];B[kc];W[jc];B[kd];W[kb];B[sf];W[qi];B[ph];W[sg];B[ri];W[sd];B[qj] ;W[sf];B[pi])) (;N[]))))) (;N[])) (;N[])) (;B[nd]LB[md:A][qc:B] (;W[md];B[ne]LB[pc:A][oc:B][qc:C]) (;W[qc];B[oc];W[qd];B[mc]LB[re:A]C[The result isn't equal because of the Black aji on 'a'.])) (;B[oe];W[qc];B[qd];W[pc];B[pg]C[Black 3 is overconcentrated now, so Black 5 was wrong.]))