I was wondering if killing an enemies sheep is allowed in division A for this tournament since this leaves the player in a disadvantage and not good sportsmanship.

Sheep in the enemies base are considered the enemies property. This would be in violation of the NR rule since technically speaking it would be attacking. I don't expect the enemy to have sheep in their base after 40 minutes lol

I'm more lenient for Division B since the NR rule for this Division does not exist. Division A I'm more strict on because it's for 'noobs'. I want fun and friendly games people. Let's not turn this into a nightmare by having unfair and unsportsmanlike games.

in bf... in team game... you try killing enemy sheep? woow.. it is unfair... because you play against some noobs.

It's a good question and I'm glad it was asked. You never know how 'lame' people will act. Especially when awards, free premiums or points are involved in the prize.