My friends favorite game to play is checkers and tic-tac-toe

I don't have all the implementation complete such as knowing when a player won, or handling edge cases or when a pawn turns into a king.

List> moves = ((Checker)piece).getPossibleMoves() Is it ok to typecast an object? Since board doesn't know what type of piece it has, I have to do this in the Checkers class.I have some code duplication for checkers in which I have an enum color but I also have a variable marker which is kinda the same thing.I use a hashmap to map a player to its marker. I also did not know how to relate a player to a marker such as x or o in tic tac toe.I am questioning this design because I could have also created an abstract method vs an interface but this would not be extendable to chess.So Pawn and King must implement this method and provide its moves.

In checkers you can move in different directions so I created a separate abstract class called Checker that inherits from Piece and implements a interface Moveable which returns the pieces moves.

Game - contains a Board, and list of players.

Piece - location of the item (row, col) on board.

I layed out the similarities between the two games with the intention of possibly extending it to chess but questioning my design.

My friends favorite game to play is checkers and tic-tac-toe