(;AB[sk]AB[rk]AB[rl]AB[qk]AB[qj]AB[qh]AB[pn]AB[nj]AB[nk]AB[mj]AB[ol]AB[pl]AB[pm]AB[oc]AB[sf]AB[rf]AB[qe]AB[pe]AB[pd]AB[pc]AB[og]AB[pg]AB[ng]AB[nf]AB[nh]AB[nc]AB[nb]AB[nl]AW[ne]AW[me]AW[mf]AW[mg]AW[mh]AW[mi]AW[ni]AW[li]AW[pk]AW[pj]AW[ql]AW[qm]AW[rm]AW[sm]AW[sl]AW[qn]AW[qo]AW[po]AW[se]AW[rd]AW[qd]AW[qc]AW[qb]AW[pb]AW[ob]AW[re]AW[of]AW[oe]AW[od]TR[sk]AB[oi]AW[oh]AW[oa]AW[qa]C[Reduce blacks territory in the middle]AB[pf]AP[goproblems] (;W[pi] (;B[ph] (;W[qi];B[ri];W[sj];B[rj];W[rh];B[si];W[sh]C[RIGHT]) (;W[oj];B[oh];W[qi];B[ri])) (;B[oj];W[qi];B[ri];W[sj] (;B[rj];W[rh];B[si];W[sh]C[RIGHT])) (;B[qi]C[];W[oj];B[ph];W[oi]C[RIGHT])) (;W[qi];B[pi];W[ri];B[oj]) (;W[ph];B[pi]C[you can do better]))