Doubling Part-Scores at Pairs

At pairs, the best part-score you can make is usually +110 to +140. Beating a vulnerable contract by one trick doubled gives +200, more than any part-score. That number explains a lot of matchpoint doubling.

The magic +200

The opponents, vulnerable, compete to 3♦ over your 2♠. You could make 2♠ for +110 or 3♠ for +140. If 3♦ goes one down:

• Undoubled: +100. Worse than your part-score.

• Doubled: +200. Better than any part-score you could make.

Not vulnerable, one down doubled is only +100, so you need two down (+300) to beat your own part-score clearly.

When a penalty double is attractive

• The opponents are vulnerable and have stretched to the three level.

• You have trumps behind declarer, for example Q 10 x or better in their suit.

• Your side has the balance of points, and partner has shown values.

• Your own fit is short, so you would struggle to make much yourselves.

When not to double

• The doubled contract is a game if it makes. 2♥ doubled and made is worth 670 to them vulnerable, or 470 not vulnerable. That's a bottom.

• Your values are in your own long suit rather than in theirs.

• You only have points, not trump tricks. Points without trumps often let declarer get home.

Partnership agreement

Agree whether low-level doubles in these auctions are for penalty or for take-out. Many pairs play competitive doubles here, so check your agreements.

Key takeaways

• At pairs, +200 beats every part-score.

• Double vulnerable opponents who stretch when you hold trumps.

• Don't double them into game.