A variant of the flyweight pattern using contextual identity. All board representation remains a bunch of uint64_t, all messages sent to boards result in bit manipulation (i.e.
not massive duplication of objects), and you instantiate the piece objects once per game.
There's simply no need for "instantiate all the things" approach assumed in the Quora answer. That is OO at its most naive.
OOP is messaging, encapsulation, and late binding. What you do inside the capsule is up to you; and at a higher level, how the behaviour emerges from a composition of objects is also up to you.
