(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[19]KM[0.50]TM[] AW[pn][ro][lp][mp][qp][rq]AB[op][kq][lq][pq][qq]LB[lp:1][mp:3][lq:2]C[Black to play - don't help white too much!] (;B[nr]CR[nr] (;W[nq]CR[nq] (;B[or]LB[nn:D][on:C][no:A][oo:B]CR[or]C[If now WA, black can cut with BB, WC; BD, so the white thickness isn't worth much RIGHT CHOICE]) (;B[mq]CR[mq] ;W[np]CR[np] ;B[or]CR[or] ;W[oo]CR[oo]C[NIce white centre thickness!]) (;B[mr]CR[mr] ;W[oq]CR[oq] ;B[or]CR[or] ;W[pp]CR[pp]C[very thick thickness for white :)]) (;B[oq]CR[oq] ;W[np]CR[np] ;B[mq]CR[mq] ;W[oo]CR[oo]C[nice white centre thickness!])) (;W[np]CR[np] (;B[oo]LB[nq:A][or:B]CR[oo]C[If WA, BB and black is safe RIGHT CHOICE]) (;B[nq]CR[nq] ;W[oo]CR[oo]C[Nice white centre thickness!]))) (;B[mq]CR[mq] ;W[np]CR[np] ;B[nq]CR[nq] ;W[oo]CR[oo]C[White has secured nice centre thickness]) (;B[nq]CR[nq] ;W[mq]CR[mq] ;B[mr]CR[mr] ;W[np]CR[np] (;B[or]CR[or] ;W[oo]CR[oo]C[White has secured nice centre thickness]) (;B[oo]CR[oo] ;W[nr]CR[nr] ;B[oq]CR[oq] ;W[lr]CR[lr]C[Black is separated]) (;B[oq]CR[oq] ;W[oo]CR[oo]C[nice centre thickness for white!])))