Grand slam captures all

Here a grand slam is legal and fully effective. If your last seed sets off a chain running through every occupied pit your opponent has, you take all of it.

That usually ends the game on the spot, since they then start their turn with nothing and your haul is normally enough to pass twenty-five. Games are shorter and far more aggressive, and spreading your seeds across several pits stops being a matter of taste: one line of thin pits can lose everything in a single move.