Some players allow the declarer's partner in a Plunge or Splash to choose No Trump, Sevens or any of the varieties of Nello instead of naming trumps. Many people play that if the first three players pass, the declarer must bid. The hand cannot be thrown in. Without special contracts Some players do not allow the special contracts Nello, Plunge and Sevens. Some players only allow Nello in the situation where the dealer was forced to bid because the other three players passed.
Some people allow small end opening .
In this case, in the first trick only, the bidder can lead a non-trump domino and specify that it belongs to the suit of the small end. Most 42 players agree that the bidder is allowed to lead a non-trump to the first trick. However, there are a few people who play that the opening lead must be a trump. The information on this form of 42 was supplied by Adam Hauerwas. In this version the bids are the numbers from 30 to 42, then 84 and 168.