(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[19]KM[0.00] PW[White]PB[Black]AW[lc][me][oe][qf]AB[ic][nd][od][pd]LB[ic:4][lc:3][nd:2][od:6][me:7][oe:5][qf:1] ;B[ne]CR[ne] ;W[nf]CR[nf] (;B[md]CR[md] ;W[ld]LB[md:A]CR[ld]C[Black A weakens White's shape - how to attack?] ;B[mf]CR[mf] ;W[le]CR[le] ;B[of]CR[of] ;W[ng]CR[ng] (;B[pe]CR[pe] ;W[og]CR[og] ;B[pf]CR[pf] ;W[pg]CR[pg] ;B[qg]CR[qg] ;W[qh]CR[qh] ;B[rg]CR[rg] ;W[rh]CR[rh] ;B[rf]CR[rf]C[After this sequence, White is left with a very powerful wall on the outside]) (;B[og]CR[og] ;W[oh]CR[oh] ;B[nh]CR[nh] ;W[mg]CR[mg] ;B[ph]CR[ph] ;W[oi]CR[oi] ;B[pg]CR[pg] ;W[pi]CR[pi] ;B[qi]CR[qi] ;W[qj]CR[qj] ;B[rh]CR[rh] ;W[pk]LB[qc:A]CR[pk]C[After this sequence, Black has sente, but White can later enter at 'A' to reduce Black's corner territory. Black can do better])) (;B[mf]CR[mf] (;W[ng]CR[ng]C[CHOICE] ;B[md]CR[md] ;W[le]CR[le] ;B[ld]LB[ne:A][mf:B]CR[ld]C[RIGHT Black B was the correct followup to Black A. Black is not fenced in to the corner]) (;W[le]CR[le] ;B[pf]CR[pf] (;W[pg]CR[pg]C[CHOICE] ;B[og]CR[og] (;W[ph]CR[ph]C[CHOICE] ;B[ng]LB[ne:A][mf:B][pf:C]CR[ng]C[RIGHT Black has the advantage. The two white groups are separated, and black now has outside influence. Black B was the correct followup to Black A. And C was the key play]) (;W[of]CR[of]C[CHOICE This is a poor choice for White. Please continue] ;B[pe]CR[pe] ;W[ng]CR[ng] ;B[oh]CR[oh] ;W[ph]CR[ph] ;B[oi]CR[oi] ;W[mg]CR[mg]C[Don't forget ladders and geta] ;B[pi]CR[pi] ;W[qi]CR[qi] ;B[qj]CR[qj] ;W[rh]CR[rh] ;B[rj]CR[rj] ;W[re]CR[re] ;B[rd]CR[rd]C[RIGHT An interesting position, and Black has the advantage of the outside and corner. Can White ignore the last Black Play at S16])) (;W[ng]CR[ng]C[This is a reasonable option for white. Now continue.] ;B[qe]LB[lg:A]CR[qe]C[RIGHT Black should feel satisfied with this sequence. Black may further mount an outward attack on the upper right side or take advantage of Whites weakness at A]))))