Neapolitan/Blue Team Four Clubs/Diamonds

A delayed game raise used to describe responder's controls in a minor suit. When opener bids and rebids a major suit or openes a major suit and rebids in notrump, and responder has excellent support for the major suit, responder bids as follows:

2C followed by 4C shows first or second round controls of clubs and deines first or second round control of diamonds
2D followed by 4D shows first or second round control of diamonds and deneis first or second round control of club
2C followed by 4D shows either first round control of clubs and diamonds or second round controls of both suits.
2D followed by 4C shows first round control of one minor and a second round control of the other.