check:
1. EFFECT_EXTRA_ATTACK
2. chain attack
3. EFFECT_EXTRA_ATTACK_MONSTER
4. effects with target limit(chain attack with a target,
EFFECT_ATTACK_ALL)

http://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5&fid=14710&keyword=&tag=-1
Now the system uses field id instead of real field id.

http://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5&fid=15829&keyword=&tag=-1
Now Duel.ChangeAttackTarget() cannot change the attack of monsters with
EFFECT_CANNOT_DIRECT_ATTACK into direct attack.