final class Pawn: Piece {
	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),
		].filter { $0.index != nil }
	}

	override var unicodeRepresentation: String {
		color == .Black ? "♟" : "♙"
	}

	override func isLegal(on pos: Square.Position) -> Bool {
		super.isLegal(on: pos)
	}

	init(with color: Color, on position: Square.Position) {
		super.init(kind: .Pawn, on: position, with: color)
	}
}