"You are not the best player of all times."

Translation: Vi ne estas la plej bona ludanto de ĉiuj tempoj.

[chaered]

Could one use "...de ĉiam" instead?

[vikungen]

Jes.

[salivanto]

I disagree. "De ĉiam" answers the question "de kiam?".

Since when? Since always.

[MNchino]

Vi ne konas mian forton.

[Davgwynne]

Presumably the English version is talking about parallel universes: "of all times". Does that also apply to the Esperanto version?
So, would "of all time" be "de ĉiu tempo" or was the English version just a typo?

[salivanto]

For more discussion see the following threads.

https://www.duolingo.com/comment/12418823

https://www.duolingo.com/comment/25531657

[faust.twi]

ci ne estas should be accepted too.

[Joffysloffy]

Hardly, as pretty much no one uses ci and its use is not recommended. Just use vi.

[faust.twi]

sorry but some people use ci. and it's recommended by common sense. use ci for singular form, please.