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In AoSNow that there are no points in Warhammer: Age of Sigmar, some seem to believe that the time of chaff has passed us by and we no longer have use for these weak misdirection units, but I disagree strongly. If you're playing with a points-derived comp system such as SDK or Pool (both of which can have lists written in this excellent tool on http://www.scrollbuilder.com/) then there certainly still exist value disparities between units and you can take grots or gnoblars without as much pain from your list. However, I still believe there is value to your chaff even if you are using wound counts as a balancing factor or sticking to the core rules and using model count alone.
Chaff can still work as a tarpit if you use it in the old fashion (a deep unit of skaven slaves, for example) but you can also change things a bit in Age of Sigmar to make use of the new rules. An optimal chaff unit in this new ruleset seems to look like a big wall of bodies, perhaps spread thin and wide. arranging like a net, the opponent loses the ability to move around them. In AoS, you cannot come within 3 inches of an enemy model in the movement phase so a relatively small unit in a broad arrangement effectively blocks the movement of anything that can't fly, and almost forces a charge out of the unit if it wants to move past your screen.
There currently is no overrun mechanism, so if the enemy does come into combat with your chaff and destroys them outright or through battleshock, you still know basically where they are going to end up and can plan your subsequent movement phase accordingly, either to charge them or move past them to the artillery piece in the back, for instance. If by some miracle your chaff does survive the round (mystic shield + inspiring presence and some terrain for cover saves is one way to increase the odds of this happening), you have effectively locked them in place for the next turn and chaff is doing the job it did in previous editions of WHFB. Alternatively, you can have your chaff unit retreat instead of piling in if it has the ability, or simply move from combat in your subsequent movement phase, rearranging the unit into a broad net and playing the same coy game again the following turn. Considering that you don't know who will have the next turn at any given point in the game, this can be a great way to stymie your opponent's advance and keep him or her from maneuvering the way that they want.
If you have a set of wizards or a cannon tossing out big damage and need to keep them defended, chaff is still a really useful tool even without a comp system, as long as you can play it right. As we see new battlescrolls emerge and new battleplan scenarios unveiled, we may find yet even more reasons to love and use chaff in our games, and I'm excited for the new tactical possibilities that will accompany it.
How have you found chaff to fare in Age of Sigmar? Do you have any tips to share or other tactics you have explored? Let us know!