Gaap the divine solider

I would like too know about his first effect..
While this card is face-up on the field, all monsters on the field are changed to face-up Attack Position and their battle positions cannot be changed. Flip Effects are not activated at this time,
so if a monster is summoned/set it is automatically chanced to face-up Attack Position?

Yes, that is true.

That also is exactly what the effect says.

BUT if your opponent plays book of moon against it, then it's face down, so monsters can change their battle position, even though gaap is on the field.

Unforgiven Pretender wrote:

Yes, that is true.

That also is exactly what the effect says.

BUT if your opponent plays book of moon against it, then it's face down, so monsters can change their battle position, even though gaap is on the field.

That guy knows his yugimonz. Confirmed.