Limping or raising from the small blind in a full-ring game

The small blind is the only seat that gets a discount on a bad deal. Everyone has folded, you have half a big blind in front of you, and one player is left behind you with position, a closed action and the option to make it expensive. We work out what completing actually costs, and when raising is the better of two awkward options.

The discount is real and it is not the point

You have posted 0.5 and the big blind has posted 1. Completing costs another 0.5 and makes the pot 2, so you are risking half a blind to win one and a half: break-even is 0.5 divided by 2, or 25 per cent. Almost any two cards have 25 per cent equity against one random hand, which is why the limp feels free and why so many players treat it as automatic.

The catch is that equity is not the same as money collected. You will play every street out of position against a player who acts last, sees your bet before deciding, and can bet when you check. A hand that is 40 per cent equity against his range realises considerably less than 40 per cent of the pot from that seat — and the gap between equity held and equity realised is the real price of completing. It does not appear in the 25 per cent.

What the big blind can do to a limping range

If you complete with a wide range, your range is capped: the very best hands would mostly have raised, so what is left is medium and weak. A big blind who notices this can raise a wide range for value and for the fold equity, and you are answering out of position with a range that cannot comfortably continue. Each individual spot is small — one and a half blinds here, three there — but it recurs once an orbit for as long as you play.

That is the structural case against limping wide. It is not that the price is bad; it is that the price buys a seat at a game you are set up to lose. Which cards do and do not belong in a range from the worst seat at the table is the subject of our page on starting hands, and the same logic read from the other end is in poker strategy in late position.

When raising is the answer

Raising from the small blind does three things a limp cannot. It takes the blind uncontested some of the time, which is the cleanest profit available in the seat. It puts your strong hands in a pot that will be big enough to matter. And it removes the cap: a raising range that contains both your best hands and some hands that need help is not readable as weak.

The sizing argument is specific to the seat. From other positions a raise of two and a half to three big blinds is standard; from the small blind, with one player to act and a positional disadvantage for the rest of the hand, a larger raise does more work, because what you most want is to be heads-up with the initiative or to win it now. The bigger the raise, the fewer flops you play from the worst chair.

When completing is still right

• Against a passive big blind who never raises a limp. The structural objection disappears when the opponent does not take the opening, and seeing a cheap flop with a hand that plays well multiway becomes reasonable.
• With small pairs and suited connectors, at a table where limps go multiway. These hands want a big pot and several opponents when they hit, and they are exactly the hands a raise turns into a two-handed pot out of position.
• When the stacks are shallow. With twenty blinds or fewer the raise commits a large share of the stack to a hand you will have to play from the worst seat, and the fold-or-shove structure replaces the limp-or-raise one entirely.

The habit to break

Not the limp — the automatic one. The small blind is the seat where the cost of playing on autopilot compounds fastest, because the decision comes round once an orbit and the discount makes it feel cheap every time. Before completing, settle two things: whether the player behind you raises limps, and what you intend to do when he does. If the answer to the second is “fold”, the hand belonged in the muck half a blind earlier. The tells that answer the first question are mostly in how the big blind plays his option, and our column on reading the big blind for tells is about watching exactly that. How the raise itself should be sized and followed up belongs with the rest of betting strategy.