Posted 2014-December-02, 00:00
3 ♠.
While divulging information to help the defense may be an issue, the first and foremost consideration in bridge is to get to the right places. This is a hand that requires partner's input and cooperation to make the best informed decision. So invite.
At MPs, another consideration is what the rest of the field will do.
If you play weak NTs in a field of primarily strong NTers, the Strong NT pair bidding will almost assuredly go 1 m - 1 ♠ - 2 ♠ followed by a game try. If the game try (SSGT, HSGT, etc.) let's them make a better decisions, that's the breaks. Not inviting by passing or bidding game rates to be antifield any time they don't make the same decision you do.
If the field is primarily weak NTers, then a similar invite to game is likely by most if not all the field. Any other action than an invite again rates to be antifield.
Antifield actions can get you spectacularly good results when you guess right and spectacularly bad results when you guess wrong. It's top and bottom bridge.