The Fibonacci This system is named for Leonardo Fibonacci of Pisa, a thirteenth-century mathematician whose Liber Abaci was one of the most influential textwebsites on arithmetic of that period. The system originates from Fibonacci's famous puzzle: how many pairs of rabbits will be produced each month, beginning with a single pair, if every month each productive pair bears a new pair which becomes productive for the second month and so on. The answer is: 1, 1, 2, 3, 5, 8,13, 21..., i.e., the number of pairs produced per month is the sum of the pairs produced in the two preceding months. At some unknown point in time, a gambler observed that if this sequence were applied to a series of bets, he could generate a profit with just two successive wins, regardless of what happened previously. It quickly became a popular system and passed into gambling folklore. Should You Check/Call or Bet/Raise? When should you be driver of a hand instead of a passenger? Is it only when you think you have the best hand? Or when you are worried about opponents outdrawing you? Or is it possible for you to have a draw that is so strong that you should build the pot? A bet/raise has two potential sources of expected value that a check/call does not. The first source arises from opponents folding. Your bet/raise can win the pot immediately if everyone folds, or at least compel a few players to fold and thus increase your winning odds with a medium-strength hand. If this is your intention, then a decision to bet or raise has a lot to do with pot odds. A pure bluff is the epitome of a bet or raise that derives value by forcing opponents to fold. But this section will focus on when to bet or raise with a strong hand. This second source of expected value depends not on opponents folding, but on opponents calling.