with a 12, you hit it always and keep hitting it seeing more cards to help your count unless you are near the shuffle card, insurance- only take it when count is high, always split nines except 7, 11 versus ten is double when count is high, if count is really low you keep hitting get more of low cards out of way, only hit 15 or 16 when count is really low, or better yet throw them in and take 1/2 bet off if casino surrounds, soft 18 - double down when count is really really low - or hit it to get low cards out. If you hold your cards in hand, and count goes low, keep hitting to get low cards out even if you go over 21. Just to get the low cards out of way. Then throw cards away so dealer can't see them.