Except in rare circumstances, you should not be limping (simply calling the big blind) preflop. There are a few reasons for this. I’ll attempt to highlight some of the major ones below.
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You want to give other players a chance to fold. One of the two ways to grow a bankroll over the long run is to force your competitors to fold off their equity (chance of winning the pot). When you limp, unless someone behind you raises, the big blind won’t need to put in more chips in order to see a flop. This could give them a chance to make a strong hand with no risk. Also, in ring games, you don’t pay rake unless you see a flop; taking the hand preflop will give you the full pot.
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Limping raises the chance of having to play against more than one competitor postflop. Multi-way pots are tricky to navigate. On average, hands will be stronger, leaving you uncertain whether your moderately-strong hand is the best at the table. That could also make it harder to get value when you make the nuts. It will be also more difficult to get bluffs through, since you’ll need to convince more players to fold.
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It dilutes your “open” range. Some hands that would be more profitable as a bet will need to be limped instead in order to disguise the strength of your limping range. This means that some of your strongest hands will get less value than they should.
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You see too many flops with weak hands. Sure, you could make the nuts, but you’ll end up getting dominated and having to throw away the blinds you’ve committed far, far more often. As a result, you end up losing chips overall.
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How do you react when someone later to act preflop raises? If it’s a small raise, you’ll probably end up having similar odds on a call (again) as you did when you originally limped. Regardless of the raise size, you’re probably well behind the raiser’s range, and that puts you in a bad spot - either you fold off your equity, or put in more chips when you’re probably behind.