HST Chessmaster Battle
Round 1: Blackbeard vs Aizen
Round 2: Aizen vs Tobi
Round 3: Tobi vs Blackbeard.
Round 4: Three way chess game.
Not a fight but rather a simple game of chest to see which one of the characters really does do the best to see through their opponents and plan ahead.
Few rules: No powers. Tobi can have his Sharingan eye since he's blind without it but no genjutsu. No Haki either(if Blackbeard has Mantra, and he probably does). Aizen can't use his zanpakuto or magical stone whose name is not easy to remember.
What they're competing for: a wish from the Eternal Dragon. All parties would appreciate that.
So who is the smartest villain?
Bonus round: Bach vs Madara for kicks.