An inside straight draw, also called a gutshot or belly buster, is a four-card sequence missing one interior card to complete a straight. Unlike open-ended straight draws that can complete with cards on either end, inside straight draws need exactly one specific rank to fill a gap in the middle of your sequence.
Inside straight draws are common situations in poker that require careful consideration. With only 4 outs to complete your straight, you have approximately 8% equity on the turn and 16% equity by the river using the rule of 2 and 4. This limited equity means you need excellent pot odds or strong implied odds to continue profitably. The term “gutshot” comes from the feeling of being punched in the stomach when you miss your draw, while “belly buster” refers to the same gut-wrenching sensation.
Despite their reputation as weak draws, inside straight draws play an important role in balanced poker strategy. They provide natural bluffing candidates when you miss, and their disguised nature means they often get paid when they hit.
What Happens with an Inside Straight Draw?
An inside straight draw occurs when you hold four cards to a straight with a gap in the middle that needs exactly one rank to complete. For example, if you hold 5♠6♦ and the flop comes 8♣9♥K♦, you have 5-6-8-9 and need exactly a 7 to complete your straight. Any of the four 7s in the deck (7♠, 7♥, 7♦, 7♣) will give you a straight from 5 to 9.
The key characteristic is the interior gap. If you held 5-6 on a 7-8-K board, you’d have an open-ended straight draw (5-6-7-8) that completes with either a 4 or a 9. But when the gap is in the middle of your sequence, you’re limited to exactly one rank.
Inside Straight Draw vs Open-Ended Straight Draw
The fundamental difference is the number of outs. Open-ended straight draws have 8 outs (any of 4 cards on either end), while inside straight draws have only 4 outs (one specific rank). This means an OESD has roughly double the equity of a gutshot. On the flop, an OESD has about 32% equity versus a gutshot’s 16%.
Another key difference is disguise. Inside straight draws are often harder for opponents to identify. When a 7 completes your 5-6-8-9 gutshot, it’s less obvious than when a 9 completes an open-ended draw on a 5-6-7-8 board.
Key Facts
| Aspect | Inside Straight Draw |
|---|---|
| Outs | 4 cards (one rank) |
| Equity on flop | ~16% (by river) |
| Equity on turn | ~8% (to river) |
| Also known as | Gutshot, belly buster |
| Pot odds needed | Better than 5:1 on turn |
Hear It at the Table
Key Takeaway
Inside straight draws are four-out draws that need exactly one rank to complete a straight. While weaker than open-ended draws with their 4 outs versus 8, gutshots remain playable in the right situations with good pot odds or when you can apply pressure as a bluff. Their disguised nature means they often get paid when they hit, making them valuable parts of a balanced strategy.
