Compare and contrast to problem number 16561. It's these small, but important differences which in turn create completely different problems which make Go great :-)
(;AB[pc]AB[qd]AB[oc]AB[nd]AB[ne]AB[me]AB[le]AB[lc]AB[kd]AB[jd]AB[jc]AW[mc]AW[nc]AW[md]AW[od]AW[oe]AW[of]AW[ng]AW[lg]AW[je]AW[jf]AW[ic]AW[id]AW[jb]AW[kb]AW[kc]C[Black to get the best out of this]AP[goproblems]
(;B[nb];W[mb]
(;B[lb];W[la]
(;B[ld];W[ma]
(;B[na];W[ka];B[ib]C[NiceRIGHT])
(;B[ka];W[ja];B[na];W[ka];B[ib]C[Nice. NB: The throw-in was not necessary and actually gives black a worse result - see comments.RIGHT])
(;B[ib]
(;W[hb]C[CHOICE];B[ka];W[ja];B[na]C[Nice. NB: The throw-in was not necessary and actually gives black a worse result - see comments.RIGHT])
(;W[ia];B[ka];W[ja];B[na]C[Nice. the throw-ins are not necessary.RIGHT])))
(;B[na];W[ld]C[Black can do better])
(;B[ka])
(;B[ma];W[na];B[ld];W[ma];B[ka];W[ob];B[ib];W[ja]C[Throw-ins have their place, but they rather ruined this...]))
(;B[ld];W[lb]C[Black can do better])
(;B[ob];W[ld];B[lb];W[la]C[Black can do better])
(;B[ma];W[lb];B[ld];W[ob]C[Black can do better]))
(;B[ld];W[lb]
(;B[mb];W[nb]C[Black can do better])
(;B[nb];W[mb]C[Black can do better]))
(;B[lb];W[ld]
(;B[ke];W[mb]C[Black can do better])
(;B[nb];W[ke];B[mb];W[kd]TR[nd]TR[ne]TR[me]TR[le]C[Black can do better]))
(;B[mb];W[nb]
(;B[ld];W[lb]C[OOps])
(;B[lb];W[ld];B[ob];W[ke]C[Oops]))
(;B[ke];W[ld];B[lb];W[mb]C[Black can do better]))