I've always dismissed using half a chanjar. You want to get rid of the opposing card's efficiency as much as possible. But some random thoughts & math about it have changed my mind a bit. However, if the enemy row of personal combat skill cards is nullified, then you're only looking at some def up that you want to tone down a bit. Suppose you use Chanjar + 1 def up skill and your opponent does the same: You have 7.5% def up and your opponent has that too. Suppose you use JJBGS + 2 def up skills and your opponent uses Chanjar: your opponent has his 25% def up effect reduced to .6 (-40%) of that, leaving 15%. You have 50% def up reduced to 30% of that, also leaving 30%. Suppose you use JJBGS +2 def up skills and your opponent uses 3x def up: your opponent has his 75% def up reduced to .6 (-40%) of that, leaving 45%. You have 50% def up and that is not going to be reduced, so it is 50%. So to conclude, if you use JJBGS and no 4* SCP, your def up skill will be at least as good as your opponent's. If you have cards with a bigger base defense, you're still winning on it. If you use 1x JJBGS and your opponent uses 3x def up, your def up boost is even bigger. This one is definitely good for boosted mids I think. Thoughts? Especially about formations where this wouldn't work.