Add Board.Position.toString().

src/pegp/board.d

@@ -33,6 +33,15 @@ class Board
             int new_col = col + dist * (((d % 3) + 1) & 1) * (d / 3 * 2 - 1);
             return Position(new_row, new_col);
         }
+
+        string toString()
+        {
+            string s = [
+                cast(char)('1' + row),
+                cast(char)('A' + col),
+            ];
+            return s;
+        }
     }
 
     this(int size)

src/pegp/main.d

@@ -5,6 +5,6 @@ import pegp.board;
 int main(string[] args)
 {
     Board s = new Board(3);
-    writeln("Peg Puzzle");
+    writeln("Peg Puzzle! Position: ", Board.Position(2, 0));
     return 0;
 }