Volcano

What happens if I move a cap such that the first erupting piece would land in an empty space?

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That's an eruption
Caps (and erupting pieces) can be moved into any empty space, including the space in the center (called the Caldera) which only remains empty until a piece erupts into it. Of course you won't capture the piece which landed in the empty space, since it did not land on a piece of the same size.
Related Rule(s)