Bidding in depth
A weak hand with a long suit or a known fit bids high to take away the opponents’ bidding room.
A strong hand wants the auction to go slowly. It has games and slams to investigate, and every round of bidding below game is room to exchange information. A weak hand with a long suit or a big fit has nothing to investigate: it cannot make much, and the deal probably belongs to the opponents. So the calculation reverses. The bidding room a strong hand needs is worth more to the opponents than to you, so the best use of your bid is to take it away. That is pre-emption: bidding higher than your strength justifies, on purpose, to force the other side to start their conversation at an uncomfortable level.
This is why a pre-emptive bid always shows a weak hand. With real strength you would be obstructing your own constructive auction.
| Partner | Opp. | You |
|---|---|---|
| 1♥ | Dbl | 3♥ |
The jump raise here shows 0–5 points with four trumps. The takeout double invited the fourth player in cheaply; the jump means they must now come in at the three level, guessing. With a good raise you would bid 2NT (Jordan) instead, so the jump is free to be purely obstructive.
Trumps take tricks even without honours. With a long suit of your own, or four or more of partner’s suit, the hand wins trump tricks whatever its point count. So a pre-emptive contract usually goes down by less than the opponents’ game would score. The Law of Total Tricks explains why. With a big fit, bidding to the level of your fit is safe, and the weaker your hand, the more likely the opponents had a contract of their own.
The other safeguard: having pre-empted, do not bid again. The pre-emptive bid said everything the hand has to say, and partner is now in charge.
Facing a pre-empt, partner knows almost exactly what you hold, and places the contract rather than inviting. A raise of your pre-empt is usually more pre-emption, not encouragement. With game interest partner uses the Rule of 17: high-card points plus trumps held reaching 17 is enough to bid the game outright.
Pre-empt on weakness, length and fit; with strength, go slow. Bid to the level your trumps justify, then leave the rest to partner: a raise of a pre-empt is more pre-emption, and the pre-emptor does not bid again.
