ACOL 4NT (Four No-Trump)
An ACOL 4NT opening bid shows an extremely strong hand, usually a one-suiter, that only needs to hear about which aces (if any) partner holds in able to bid a slam. The responses to the ACOL 4NT are:
5 | 0 aces |
5 | Ace of diamonds only |
5 | Ace of hearts only |
5 | Ace of spades only |
| 5NT | Any two aces |
| 6 | Ace of clubs only |
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