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Betting before the flop:
1. Limit number of opps. Your chances of winning decrease significantly when more opps are in. If you have an equal chance of winning HtoH, your 50%. If its 3-way, your 33%... If its 4-way, your 25%. You generally only want to raise hands that are strong by them selves (e.g. AA, KK, QQ, AK, etc)
2. Increase size of pot. If you are holding AA preflop. Your job is to get as much money in the pot and limit the field. AA HtoH is about 80% favorite. With more people in the hand, you could drop down to even money or less to win. You generally want to build the pot if you believe you have the best hand or drawing to the best hand.
3. Preempt opps. Opps that might normally stay in for a call might fold to a raise. Again any raising should be backed-up with good cards. If you raise/bluff frequently, you will lose in the long-run
4. Take aggressive posture. Being the aggressor is generally a good position.
5. Buy a free card. It is typical if you raise before the flop (and in position), your opps will tend to check to you ("check to the raiser"). You have the option to bet or check and get a free card. E.g. You have AK and are the dealer. You raise preflop (33% your will hit a pair on the flop, 50% you will hit a pair on the river), the flop drops w/o a A or K, opps check to you. Now with your preflop raise you have the option to see the 4th card or semi-bluff the pot.
Statistically, certain preflop cards have higher percent chance to win (when HtoH). E.g. 23o is about 35% HtoH and 20% in 3-way vs AA is about 80%+ HtoH and 60%+ in 3-way. In these scenarios, you generally want to raise preflop when you have statistically strong hand.
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