(;AB[ra]AB[qb]AB[rc]AB[pc]AB[pd]AB[od]AW[pa]AW[qa]AW[pb]AW[ob]AW[oc]AW[nd]AW[md]AB[ne]AB[of]AB[le]AW[lc]AW[lb]AB[kd]AB[kc]AB[kb]AP[goproblems] (;B[mb] (;W[na] (;B[la];W[ma];B[ka];W[mc]C[White is reduced to 4 points in senteRIGHT]) (;B[nb];W[ma]) (;B[ma];W[la] (;B[nb];W[nc];B[oa];W[mc]) (;B[nc];W[mc])))) (;B[la];W[mb]C[Sente, but after Wa Bb White is left with 5 points. You can do better!]LB[ma:a]LB[ka:b]) (;B[na];W[mb];B[la];W[ma];B[ka]) (;B[ma];W[la] (;B[nb];W[nc];B[mb];W[na];B[oa];W[mc]) (;B[mb];W[nb])) (;B[nc];W[nb]) (;B[nb];W[nc];B[mb];W[na] (;B[ma];W[mc];B[oa];W[la]) (;B[la];W[mc];B[ka];W[ma])))