Space Invaders

Bottom
/fill ~ ~1 ~ ~10 ~1 ~20 stone 0 replace redstone_block

-Z Side
/fill ~ ~ ~1 ~10 ~ ~21 redstone_block 0 replace stone

/scoreboard objectives add boomchickens dummy

/execute @e[type=Arrow] ~ ~ ~ execute @e[type=Chicken,r=1] ~ ~1 ~ summon PrimedTnt ~ ~ ~

/scoreboard players set @e[type=Chicken] boomchickens 1 {OnGround:1b}

/execute @e[score_boomchickens_min=1] ~ ~ ~ summon PrimedTnt