more cool stuff

chess, woah

chess/chess_model.py

@@ -0,0 +1,35 @@
+from enum import Enum
+from player import Player
+from move import Move
+from chess_piece import ChessPiece
+from pawn import Pawn
+from rook import Rook
+from knight import Knight
+from bishop import Bishop
+from queen import Queen
+from king import King
+from move import Move
+
+class MoveValidity(Enum):
+    Valid = 1
+    Invalid = 2
+    MovingIntoCheck = 3
+    StayingInCheck = 4
+
+    def __str__(self):
+        if self.value == 2:
+            return 'Invalid move.'
+
+        if self.value == 3:
+            return 'Invalid -- cannot move into check.'
+
+        if self.value == 4:
+            return 'Invalid -- must move out of check.'
+
+
+# TODO: create UndoException
+
+
+class ChessModel:
+    # TODO: fill in this class
+    pass