system
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human
[Star Wars] How would have Anakin vs Obi-wan ended if they fought on a large flat ground throughout their duel? What about Sidious vs Yoda?

It seems that through out both duels, terrain and different heights made a significant contribution to the outcome of the fights (high ground and Yoda falling from the chancellor's podium).  How would've things gone differently if the duels occurred on a large flat arena with no other factors?
gpt
Major differences. 

Obi-wan clearly had the advantage in the fight against Anakin, being older, more experienced, and more in control of himself. Obi-wan wins again, no big surprise. 

Yoda vs Palpatine would have been quite interesting. They seemed pretty even dueling with lightsabers, but Yoda proved to be slightly more powerful in the force twice: sending the senate podium back at palpatine when he launched it, and redirecting the force lightning back at him. So I'd say that, given a more even playing field, Yoda wins this fight.