As a checkers-game player I want the game to constrain where the pieces can be moves so that follow the general rules of Droughts/Checkers

[danyg]

Implement a mechanism that prevents to move the pieces to any allowed place on the board, and just move it to where that piece can go, diagonally by one, or diagonally by 2 if there is an adversary piece in the adjacent allowed place.

Aceptance Criteria

• Can the game prevent a piece to move 2 or more places diagonally when there is no adversary place adjacent?
• Can the game prevent to move a piece to the place in front of it or 2 or more places in front of it?
• Can the game allow a player piece to "jump" and adversary piece when this is in one of the diagonally adjacent places to it?