As far as I have encountered the hands that partner or me opening gambling 3N, we rarely can really make the 3N contract, usually because the opponents can run the other suits and the dummy cannot really stop the leading suit and/or the suit after first lead, just wonder whether this convention is really a useful one? If yes, in terms of pre-empting opponents or really just "gamble" a chance to make 3N by running the minors? How often does gambling 3N work? If the chance of success is not high, why people are still keeping this convention?
