Can now move pieces

Sources/Engine/Pieces/Pawn.swift

@@ -17,37 +17,8 @@ final class Pawn: Piece {
 		color == .Black ? "♟" : "♙"
 	}
 
-	override func move(to dst: Square.Position) {
-		if !(legalPositions.contains { $0 == dst }) {
-			return
-		}
-
-		delegate?.movePiece(self, to: dst)
-
-		// if let board = board, var s = board[position], var d = board[dst] {
-		// 	s.piece = self
-		// 	d.piece = nil
-		// }
-
-		// position = dst
-
-		// return true
-	}
-
 	override func isLegal(on pos: Square.Position) -> Bool {
-		// TODO: Handle "En-Passant"
-		if let board = board, let s = board[pos] {
-			if let p = s.piece {
-				if p.color == color { return false }
-				if p.kind == .King {
-					// TODO: Notify board of check
-					delegate?.notify(.kingInCheck(self))
-					return false
-				}
-			}
-
-		}
-		return true
+		super.isLegal(on: pos)
 	}
 
 	init(with color: Color, on position: Square.Position) {