Do move triggers get resolved before attack/defend triggers get put on the chain?

Ruling: Yes, move triggers resolve on a chain outside the showdown before it starts. You cannot start a showdown while there is a chain, so once the move trigger chain fully resolves, the showdown can begin with its initial chain containing attack/defend triggers.

Sequence:

• Move trigger is added to the chain as pending
• Cleanup finalizes the trigger onto the chain (step 8)
• The chain resolves completely
• Showdown begins (step 9 of cleanup, only if there is no chain)
• Attack/defend triggers go onto the initial chain of the showdown in order: attacker triggers first, then defender triggers
• Initial chain resolves (LIFO - last in, first out)

Nuances:

• Move triggers happen before showdown begins, so the rules about combat and showdowns don't apply to move triggers
• You cannot react in response to a move itself
• A showdown only begins during cleanup if there is no existing chain