Your intuition here is right on the money. I wrote a subsequent post with pretty much that exact approach: https://mbuffett.com/posts/compressing-chess-moves-ev

Your intuition here is right on the money. I wrote a subsequent post with pretty much that exact approach: https://mbuffett.com/posts/compressing-chess-moves-even-further/ https://mbuffett.com/posts/compressing-chess-moves-even-furt...