A couple of what appear to be rules typos:

1. 5c Once trump is broken, anyone can throw either trump or other suit.

Do you mean LEAD trump? Throw implies that if someone breaks trump, another player can also play trump on the same hand even if they have the suit that was led. This negates most of the advantage of being short-suited.

2. 5d The BIG joker is the most powerful card (i.e. the HIGHEST SPADE).

When thrown, both players on the other team must follow with their

largest trump card while the partner may lead any spade (if they have

one).

I suspect this should read "When LED... partner may THROW...". Otherwise, the other team may have already played their cards.

3. 6.a.iii adds up the score incorrectly, leading to confusion about going set. I assume that you should not get any points for bidding 4, only go set for the number of tricks by which you missed your bid, i.e. (4 tricks - 2 tricks) x -5 points. This agrees with the -10 point total that you state.

4. 6.b.iii doesn't agree with the basic rule of 6.a.iii because you say you go set by the number of tricks you bid, rather than by the number of tricks you missed your bid by. So if I bid BOARD on a 3 trick hand and got 2, I would expect to go set by -10 (double the normal penalty of -5). But this could be a special penalty (6x normal) for bidding BOARD, where you go set by your whole bid, even if you come within one trick of taking your bid.