Invisible Cuebids
Splinters, and Doubles
This is an extension of "Unusual vs Unusual." These can be used as a defense against any known two-suited overcall (say Michael's).
The invisible cue bids work as follows:
Bidding the lower known suit: 10+ hcp, support for partner
Bidding the higher known suit: 10+ hcp, showing the "4th" suit.
The invisible splinters are:
Jumping in the other suits: 10+ hcp, splinter w/ support
*Bidding the 4th suit: 10+ hcp, splinter w/ support [note: some may not want to play this as a splinter]
An extension of this is:
Direct raise of partner: up to bad 9 hcp, support
Game raise of partner: 8-9 hcp, good shape
Directly doubling: 10+ hcp, good defense of their suits
pass then double: you could only double one of their suits
pass then raise: up to bad 9 hcp, support, you might have doubled the other suit
Examples: [for these examples: Michael's = cue bid showing both majors or the other major and an unknown minor. 2NT = jump to 2NT showing 5-5 in the two lower unbid suits]
part opp you
1C 2C 2H [2C is michael's] 2H shows good support for partner (ie
10+ hcp, 5+ clubs)
1C 2C 2S [2C is michael's] 2S shows 10+ hcp with the "4th suit":
diamonds.
1C 2C 3C [2C is michael's] 3C shows 9 or less hcp and support
1C 2C 3H splinter in hearts, 10+ hcp, support for clubs
1C 2C *2D splinter in diamonds, 10+ hcp, support [note: some might
play this as 6-9 with diamonds]
1C 2C Double = you want to penalize their major suits [thus, if
partner bids on partner shows either: a hand that cannot help you penalize them, or a big hand that is looking for game]
1H 2H 2S [2S is michael's] 2S shows 10+ hcp and heart support
1H 2H 3S splinter in spades, 10+ with heart support
1H 2H 3H bad heart raise