REDU format ruling
Acid Trap Hole

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Target 1 face-down Defense Position monster on the field; flip it face-up, then destroy it if its DEF is 2000 or less, or return it face-down if its DEF is more than 2000.
Rulings
Select 1 face-down Defense Position monster. Flip it face-up, and if the DEF of the monster is 2000 points or less, destroy the monster. If the DEF is more than 2000 points, return the monster to face-down Defense Position.
- A face-down Jinzo will be destroyed by this card.
- If the monster flipped face-up has an effect that changes its DEF, such as Enraged Muka Muka, calculate the current DEF, then determine if it will be destroyed or flipped back face-down. So if you had 4 cards in your hand, Enraged Muka Muka would not be destroyed.
- If the targeted monster has a Flip Effect, that Effect is activated whether the DEF is greater than 2000 or not. If the DEF of the selected monster is 2000 or less, such as a Hane-Hane, it can not select itself for its Flip Effect since it is destroyed.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.