card counting is an issue I can't quite understand.

It seems to me that if someone has a good memory or the ability to handle figures rapidly in their head it shouldn't disqualify him or her from playing Blackjack.

Now, if people use a device of some kind, or set up a scam using 2 or more persons, then I can understand why it would be considered illegal. After all gaming of all kinds is supposed to be a one-on-one proposition, without assistance of any kind.

Here's a good story about card counting at Blackjack in Las Vegas casinos and how they fight back.

This article explains how Blackjack card counting works.

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