Updated.

chess/src/chess/Actor.java

@@ -2,8 +2,8 @@ package chess;
 
 // An actor is an entity capable of making descisions on the board.
 abstract class Actor {
-    ActorCol col;
+    Util.Col col;      // The color the Actor is acting as.
+    Boolean inCheck;   // Whether the Actor is currently in check.
+    Boolean canCastle; // Whether the Actor can castle.
+    Boolean won;       // Whether the Actor has won.
 }
-
-// The color an Actor may assume.
-enum ActorCol { WHITE, BLACK }

chess/src/chess/Board.java

@@ -16,8 +16,8 @@ class Coord {
 
     // Return coordinates relative to the selected color's position on the
     // board. White on top, black on bottom.
-    Coord rel(ActorCol col) {
+    Coord rel(Util.Col col) {
-        return col.equals(ActorCol.BLACK)
+        return col.equals(Util.Col.BLACK)
             ? new Coord(this.x, Util.boardW - this.y)
             : this;
     }

chess/src/chess/Util.java

@@ -4,4 +4,7 @@ package chess;
 class Util {
     // Width of a chessboard.
     static int boardW = 8;
+
+    // The color a piece can be.
+    enum Col { WHITE, BLACK }
 }