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 Michaels).

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 with support
• *Bidding the 4th suit: 10+ HCP, splinter with 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