What algorithms are needed to write checkers (game) in js?

Question

JavaScript

An 8x8 field was created based on the tables.
Checkers objects are created.
All of them have a common class.
Listening for events by class.
What algorithms are needed to write game logic?

Answer 1

It is necessary to implement 2 algorithms:
"protection"
"attack"

Answer 2

Are you talking about AI or just game mechanics?