~ chess masters store about 20k chunks, comparable to avg. English speaker's vocab

It is estimated that most English language users have a vocabulary of around 20,000 words. American psychologist Herbert Simon has estimated that chess masters command a comparable vocabulary of patterns, or chunks.

— ❐ Bounce

or we double it:

It has been estimated that an expert chess player can distinguish roughly 50,000 types of positions.

— Peripheral Vision: Expertise in Real World Contexts