Multicolored Two Diamonds

An opening bid of 2

that contains multiple meanings. The bid can be made with Weak Two-Bid in a major or the Roman Two Diamonds (strong three suiter.) A response of 2

is customarily played as a Negative Response, after which opener will pass with a Weak Two-Bid in hearts, bid 2

with a Weak Two-Bid in spades, or make some other bid.