Picturing Declarer's Hand from the Bidding
Combine the auction's point range with what you can see in your hand and dummy to place the missing high cards before you choose your defence.
Every auction tells a story. When declarer has shown a narrow point range, you can add up the points you can see, subtract from 40, and work out almost exactly what partner holds. That turns guesswork into planning.
Why it works
There are 40 high-card points in the pack (ace 4, king 3, queen 2, jack 1). You can see your own hand and dummy. Declarer's bidding gives a range. Whatever is left belongs to partner. Once you know partner's strength, you also know which missing honours declarer must hold.
A worked example: Placing the missing honours
The Auction: South opens 1NT (12–14). North raises to 3NT. Partner leads the ♠Q.
Dummy (North):
♠ 8 6
♥ K Q 7
♦ K J 10 9 4
♣ Q 5 2
11 HCP.
Your Hand (East):
♠ A 9 4
♥ J 10 8 3
♦ A 7 5
♣ K 8 3
12 HCP.
You and dummy have 23 HCP. Declarer has 12–14, so partner has only 3–5. The ♠Q lead suggests ♠Q J, which is already 3 points.
The missing honours are the ♠K, ♠Q, ♠J, ♥A, ♦Q, ♣A and ♣J — 17 points. Partner has the ♠Q J and at most one of the ♦Q or ♣J. So declarer must hold the ♠K, ♥A and ♣A.
That tells you two things. First, a club switch is hopeless — declarer has the ♣A sitting over your king. Second, partner has no entry to cash established spades later. The defence depends on you keeping a spade to lead when you win the ♦A.
So play the ♠9 at trick one, encouraging, rather than winning the ♠A and returning the suit. When you later win the ♦A, you still hold spades to lead back towards partner's established suit.
Four common mistakes
Defending as if partner might hold an ace that the point count rules out.
Forgetting to update the picture when declarer shows up with a card you had placed with partner.
Counting only high cards and ignoring the shape the auction shows (for example, a 1NT opener is balanced).
Doing the count too late — the key decision is usually at trick one.
When the rule does not apply
Wide ranges give less information. After an auction such as 1♠ – 4♠, declarer could hold anything from a minimum to a strong hand, so the count narrows things less. Players also open light or upgrade hands, so treat the picture as very likely rather than certain, and revise it as cards appear.
Key takeaways
40 minus your points, dummy's points and declarer's range gives partner's points.
From partner's points, work out which missing honours declarer must hold.
Choose a defence that works against the hand declarer actually has.
Do the count before playing to trick one.