So I recently got serious about playing the game. I read "how to beat the dealer" by Edward O. Thorpe- back in the day and its had me hooked ever since but I havent really put much effort into it until now. I know basic strategy and am pretty thorough at counting down a deck. My question is how do you determine which system to invest your time in learning? I have read that if you plan on playing in games with more than two decks you should stick to something simple like the KO system. Is the unbalanced KO system worth the time and effort? Thank you for your responses.