Hand reading is the process of making educated guesses about the possible cards an opponent may hold based on the sequence of actions in the pot. The term ‘hand reading’ is actually a misnomer due to the fact that a professional poker player does not attempt to put a player on an exact hand. Rather he attempts to narrow the possibilities down to a range of hands which makes sense based on the past actions of his opponent. A tell is a detectable change in an opponent’s behavior or demeanor that gives clues about his hand. Educated guesses about an opponent’s cards can help a player avoid mistakes in his own play, induce mistakes by his opponent(s), or influence the player to take actions that he would normally not take under the circumstances. For example, a tell might suggest an opponent has missed a draw, so a player seeing it may decide a bluff would be more effective than usual.
The fundamental theorem of poker, introduced by David Sklansky, states that: every time you play your hand the way you would if you could see your opponent’s cards, you gain, and every time your opponent plays his cards differently from the way he would play them if he could see your cards, you gain.[1] This theorem is the foundation for many poker strategy topics. For example, bluffing and slow-playing (explained below) are examples of using deception to induce your opponents to play differently than they would if they could see your cards. There are some exceptions to the fundamental theorem in certain multi-way pot situations, as described in Morton’s theorem.
The relationship between pot odds and odds of winning is one of the most important concepts in poker strategy. Pot odds are the ratio of the size of the pot to the size of the bet required to stay in the pot.[1] For example, if a player must call $10 for a chance to win a $40 pot (not including his $10 call), his pot odds are 4-to-1. To have a positive expectation, a player’s odds of winning must be better than his pot odds. If the player’s odds of winning are also 4-to-1 (20% chance of winning), and if he plays the pot five times, his expected return is to break even (losing four times and winning once).
Texas hold ‘em starting hands consists of two Hole cards in the poker game of Texas hold ‘em, which belong solely to the player and remain hidden from the other players. Five community cards are also dealt into play. Betting begins before any of the community cards are exposed, and continues throughout the hand. The player’s “playing hand”, which will be compared against that of each competing player, is the best 5-card poker hand available from his two hole cards and the five community cards. Unless otherwise specified, here the term hand applies to the player’s two hole cards, or starting hand.