Initial commit
Progress on SlidingPiece move method
Tune sliding piece move method.
Build render method and move method
Fix delta problem in move method for pieces
Add working pawn
Add in_check? method to board class
Add valid_move? method to Piece and undo_move method to Board
Start building Chess class
Progress on play method in Chess class
Fixes problem with undo move method
Add unicode characters to chess ui
Add letter notation and reverse y-axis for UI
Add proper declaration of winner
move valid_move method out of Piece class
Add error rescuing
Add colored text
Add save/load functionality
Refactor stepping_piece.rb