how to get backed off, part 1...
Some "lessons from the pits" learned by "yours truly"
1. Play too long. I found myself getting into "the BJ zone" (sorry Eliot) and almost getting into a trance. If you play long enough, someone will get interested, and before you know it they run a skills check with the eye. You might get backed off during the extended session, or more commonly the next time you play, particularly if you use a player's card so that they can ID you and attach a note for the next time they check your card.
2. Play too mechanically. Ramp the bet according to the count, drop it when the count drops, even though you just won two hands of $100. quadruple your bet after a loss because the count went up by 4. Etc. A blind deaf mute could figure out what you are doing.
3. Win. As you win you need to "rat-hole" when possible, that is remove a chip here and there (preferably a big denomination chip) to "hide" your EV from the dealer and pit. RFID is going to make this impossible, but for now not many pits use RFID chips. I've been backed off simply for winning, without even having a chance to spread my bets. I've been backed off for winning because it was pretty obvious I was winning. If you keep your chips neat, with different denominations in different stacks, all the better for the pit to keep up with your winning rate.
4. Never drink anything. I personally do not use alcohol products. But I do try to have a glass of tea or something close by, and get my wife to bring refills, so that it appears that I am not avoiding drinking, which is a signature of a serious counter.
5. Never talk. No joking. No bitching when the dealer pulls a 6-card 21 and you have two doubled hands on the table. No bitching when you double a 11 and get an A, because you know that hilo counts aces and 10s together and you know that you are going to get an A in high counts, on occasion, so it is expected and nothing to complain about.
6. Never toke. Excessive toking is just as bad as misplaying hands as you are losing EV, but a small toke here and there goes a long way toward avoiding that "counters never toke" profile.
7. Let everyone know when someone asks about a play that "the correct BS play is to split those 4's only against a 5 or 6. Make sure that the dealer and even more importantly, the pit, knows that you know basic strategy, that you have read several BJ books, and that you have BJ software that lets you sim hands to analyze the options. Particularly explain to others why they should split their 8's against a dealer's 10, because it is about limiting their losses, not winning that bad hand. Etc.
8. Make it clear you are a techno-phobe. That is you have computers everywhere, you practice BJ everywhere, in your car, on your PDA, when you are in the little boys room, but really play up your computer expertise.
9. Don't practice. Make sure that when you play, you have to focus intently on each card as it is played. Even better, move your lips as you count 3, 4, 3, 2, 3, 4, ...
10. If you win the last hand before a shuffle, always drop back to the min bet when the dealer shuffles, after all the RC/TC is now back to zero.
11. Make every obvious BS departure based on the count. If the TC is at +4, always split 10's against a 6. Never split 10's otherwise. The pit is too stupid to figure that out and it's a good play.
Once you have gotten good at the above, and you decide that you would like to play rather than getting kicked out of every casino you visit, you begin to learn the real ropes. Blending in. "hiding in plain sight" is often mentioned. But if you watch as you play, you can learn to "fly under the radar". The best bit of advice I ever got is to do just that. If I watch you play, I am pretty sure I can detect the fact that you are counting. I see this pretty often when I am playing and notice that someone at my table is also. I try to leave when I see that, because two stand out more than one. But the point is that if you don't attract attention, you will probably not be found out, until you start betting very big (black and beyond). But if you do something to attract attention, a replay of the tape by the eye folks will get you every time. So your job is to simply not be noticed....
Good luck. And note that +none+ of the above was intended to be insulting toward your play. Those are all things I did in my first year or two of counting, and which caused me to run afoul of a pit here and there until I realized what I was doing...
How you dress, how you look, how you act, how you talk, how you "blend in with the crowd" is the key. If you stand out, you'll eventually get noticed. That is the beginning of the end..