A notrump structure is the set of openings used to describe balanced hands of various strength.
| 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard American Yellow Card | 0.5NT | 1NT | 1.5NT | 2NT | 2.5NT | 3NT | |||||||||||||
| Bridge World Standard | 0.5NT | 1NT | 1.5NT | 2NT | 2.5NT | Kokish relay to 2NT | |||||||||||||
| Culbertson and Goren (original) | 0.5NT | 1NT | 1.5NT | 2NT | 3NT | ||||||||||||||
| Goren (revised) | 0.5NT | 1NT | 1.5NT | 2NT | 2.5NT | 3NT | |||||||||||||
| Acol | 1NT | 0.5NT | 1.5NT | 1x - 3NT | 2NT | 2.5NT | 2♣ - 3NT | ||||||||||||
| Precision | 0.5NT[1] | 1NT[1] | 1♣-1NT | Kokish relay to 1NT | 1♣-2NT | Kokish relay to 2NT | 1♣-3NT | Kokish relay to 3NT | |||||||||||
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