Welcome to Backgammon.
You can attack from the top of each stack to the bottom of each partnering stack. And the bottom of each stack can attack to the top of each partnering stack. The two stacks on each end can attack the opposite stack on the board. Although the two (2) stacks attack at a significant disadvantage, 3v6.
Bonuses are had by obtaining each stack on the board.
There are a limited number of attacks (8) and fortifies (2) per turn so beware of how you use them.
The card count has been modified to all for quicker trade ins. The card count is as follow A (18), B (18), C (18), Wild (12). And the trade in value has been modified to 2,3,4,2,3,4,... You can also hold up to five cards before a trade in.
You may return to attack after fortify. And you may keep up to 10 units in reserve.
Enjoy!