This little rules change makes a huge difference!
- You can place pieces aggressively to force an opponent to leave spots open.
- You need three spaces in a line for a free move, instead of two. (And sometimes you can't play in those three anyways because it blocks other dominoes.) Five in a line can often net you two plays, but I don't think I ever had a group worth three.
- The "liberty" rule is still different from Go and NoGo, because each domino needs the free space, not just each connected group of similarly-oriented dominoes.
- When the game breaks up into subregions, sometimes they're not all independent.