|Bridge has evolved over the years and
has become a bidder's game. When the opponents open the
a bid by your side is an termed an overcall. Overcalls come in many flavors.
An Simple Overcall is made at the cheapest level available. An overcall on the 1 level promises a minimum of 8 points and a good 5 card suit. If you have a weakish suit you need a good hand to justify your overcall.
A simple overcall usually limits your hand to 16 Points. With more strength you would double first and then bid your suit at your first opportunity.
If you overcall on the 2 Level your promise more values. If you are overcalling with a 5-card suit you need opening values -- if you suit is longer -- you can overcall with fewer points.
Jump Overcall -- A Jump Overcall is weak -- promising values similar to a Weak Opening at the level you bid.
1NT Overcall should show 15+ - 18 and promise stoppers in the opponent's suit.
Note: I prefer "systems on" for advancer when partner overcalls 1NT. Discuss this with partner.
Two Suited Overcall -- Conventional Bids Like Michaels and the Unusual Notrump
Reasons to Overcall
Did the opponent's find a fit, and if not -- what is your holding in Opener's suit. There are many factors to consider.
Raising Your Partner Overcall when you have a Fit
When your partner bids and your RHO passes and you hold a balanced hand with 2 of your partner's suit -- you might consider bidding notrump in hopes of improving the contract. If your RHO does enter into the auction proceed with caution.
Guidelines for Bidding Notrump in Response to An Overcall by your Partner