Gambling 3 No Trump
The 23-25 hands rarely come up, and can be bid via the strong 2C. This frees up the 3NT bid for something that comes up as frequently a hand with a long and solid minor.
So, Gambling 3NT shows: -a long and solid minor (usually 7 card suit) -most likely the point count is: 12-17 -no four card major -no voids
Responses to Gambling 3 NT are:
pass: partner I've got stoppers in the others suits!
4C: run! partner pass or bid diamonds!
4D: slam try
4M: 6 card suit w/ no outside A
Opener can rebid 4NT or 5 of the minor as discouraging
4NT: slam try, and not enough for (2)
5C: Just couldn't let opener play in 3NT.
Opener corrects to 5D if D are the suit.