How can οὐδενὸς χείρους mean 'no one better'?

Greek
1

Plato, Meno 94b: (Pericles taught his sons horsemanship, such that) οὐδενὸς χείρους Ἀθηναίων
Why doesn’t it translate as “no one worse” (among the Athenians)?

2

χείρους is acc. pl. He taught them to be χείρους (worse) than οὐδενὸς Ἀθηναίων (nobody of the Athenians). Worse than no one = as good as anyone.

3

Thank you. This has helped me to work it out.