Goal crease differences & location of benches

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Originally Posted by bsaucer

I've seen a layout with both benches on one side, and penalty boxes on opposite side. The length of the rink was shorter than regulation because of the size of the building. My question is this: If substitutes leave their own bench into the attacking zone, can that cause an offside situation?

Absolutely. If they're in the attacking zone before the puck, they're offside.

Also, what rule book does the ECHL use?

The ECHL rulebook. Professional leagues usually operate under their own rules.