Lots of changes

Sources/Engine/Pieces/Pawn.swift

@@ -1,51 +1,47 @@
 final class Pawn: Piece {
-	var kind: Kind = .Pawn
-	weak var board: Board?
-	var color: Color
-	var position: Square.Position
-	var pseudoLegalPositions: [Square.Position] {
+	override var pseudoLegalPositions: [Square.Position] {
 		let sign: Int8 = color == .Black ? -1 : 1
 		return [
 			position + (1 * sign, 0),
 			position + (2 * sign, 0),
 			position + (1 * sign, 1),
-			position + (1 * sign, -1)
+			position + (1 * sign, -1),
 		].filter { $0.index != nil }
 	}
-	var legalPositions: [Square.Position] {
+
+	override var legalPositions: [Square.Position] {
 		pseudoLegalPositions.filter { isLegal(on: $0) }
 	}
 
-	var unicodeRepresentation: String {
+	override var unicodeRepresentation: String {
 		color == .Black ? "♟" : "♙"
 	}
 
-	func move(to dst: Square.Position) -> Bool {
-		guard board != nil else {
-			return false
-		}
-
+	override func move(to dst: Square.Position) {
 		if !(legalPositions.contains { $0 == dst }) {
-			return false
+			return
 		}
 
-		if let board = board, var s = board[position], var d = board[dst] {
-			s.piece = self
-			d.piece = nil
-		}
+		delegate?.movePiece(self, to: dst)
 
-		position = dst
+		// if let board = board, var s = board[position], var d = board[dst] {
+		// 	s.piece = self
+		// 	d.piece = nil
+		// }
 
-		return true
+		// position = dst
+
+		// return true
 	}
 
-	func isLegal(on pos: Square.Position) -> Bool {
+	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
 				}
 			}
@@ -54,10 +50,7 @@ final class Pawn: Piece {
 		return true
 	}
 
-	init(
-		color: Color, on position: Square.Position
-	) {
-		self.color = color
-		self.position = position
+	init(with color: Color, on position: Square.Position) {
+		super.init(kind: .Pawn, on: position, with: color)
 	}
 }