Choosing 3NT Over 5 of a Minor

When both contracts are sound, 3NT is usually preferable to 5♣ or 5♦. Both earn the same game bonus, but 3NT needs two fewer tricks and its overtricks score more at matchpoints.

The maths behind 3NT versus five of a minor

• 3NT: nine tricks; 40 + 30 + 30 + 300 game bonus = 400 non-vulnerable.
• 5♣ or 5♦: eleven tricks; 5 × 20 + 300 game bonus = 400 non-vulnerable.

Both score 600 vulnerable when made exactly. No-trump overtricks score 30 each; minor-suit overtricks score 20. However, an extra trick available through ruffing may make the minor contract safer. Check stoppers and a credible source of nine tricks, not points alone.

A worked example: Steering to no-trumps

Partner opens 1♦. You play a natural system where a direct 3NT response shows a balanced game-going hand.

Your hand (responder):
♠ K J 4
♥ A Q 8
♦ K 10 9 4
♣ Q 7 3
15 HCP.

The auction:

• Partner: 1♦
• You: 3NT

You have a balanced hand and stoppers in the side suits, so 3NT is a reasonable target under those agreements. A 1♦ opening does not necessarily promise enough diamonds to establish an eight-card fit. Even if a fit is later confirmed, do not automatically choose five of a minor. If your system assigns a different meaning or range to a direct 3NT response, use your agreed game-going route instead.

Four common mistakes

• Raising a minor straight to game just because a fit exists.
• Choosing 3NT with an unprotected side suit.
• Believing 3NT scores more than five of a minor when both make exactly: their scores are equal.
• Ignoring the trick source and entries while relying only on a point total.

When the rule does not apply

If a side suit is unstopped or shortages create valuable ruffs, five of a minor may be safer. A hand with eleven easy tricks in trumps may not have nine in no-trumps. Choose the contract that fits the actual hands.

Key takeaways

• 3NT needs two fewer tricks than five of a minor.
• Both games score equally when made exactly.
• Check stoppers, entries and a source of tricks.
• Prefer a minor game when ruffing power or an unstopped suit makes it safer.