         }
         
         // If final, add boundaries to played boundaries.
-        if final {
+        if submit {
             var finalBoundaries = [boundary]
             finalBoundaries.extend(intersections.map({$0.1}))
             for finalBoundary in finalBoundaries {

    }
    
    /// - Parameter boundary: Boundary to check.
    /// - Parameter final: Whether this move is final or just used for validation.
    /// - Returns: True if boundary appears to be playable and words are all valid.
    func playBoundary(boundary: Boundary, final: Bool) throws {
        // If boundary validation fails, fail.
        if !boundary.isValid { throw ValidationError.InvalidArrangement }
        

                }
            }
        }
        
        // Should happen after this method...
        // TODO: Change tiles to 'fixed'
        // Increment score
        // Draw new tiles. If count == 0 && rackCount == 0 complete game
        // Change player
        // Attempt AI play
        // Increment score
        // Draw tiles. If count == 0 && rackCount == 0 complete game
        // Change player
        // Wait
    }
    
    /// - Parameter letters: Tiles to attempt to play.
