Truf House Rule 2
Truf House Rule 2 is very similar to House Rule 1. In fact, House Rule 2 is created so that even with only two persons available, they can play this very enjoyable game. You'd better read Truf House Rule 1, as here I'll only explain the difference.
Minimum 2 players are needed to play the game, and the maximum is 4 players.
Bidding is identical to House Rule 1, except that total number of tricks is always 13 no matter how many players are available in a table. If there are less than 4 players, 13 cards are dealt to each player and the rests are discarded.
Playing is identical to House Rule 1, except that there are always 13 rounds no matter how many players are in a table.
Scoring is identical to House Rule 1. Scoring for 4-player mode is always used (ie, those who bid zero will get five points, either positive or negative).
The above rules are enforced by the game engine, so you don't have to worry about making mistakes.