final class King: Piece {
	typealias Threats = (Piece?, Piece?)
	var threats: Threats = (nil, nil)
	override var unicodeRepresentation: String {
		return color == .Black ? "♚" : "♔"
	}

	override var pseudoLegalPositions: [Square.Position] {
		[
			position + (1, 0),
			position + (1, 1),
			position + (0, 1),
			position + (-1, 1),
			position + (-1, 0),
			position + (-1, -1),
			position + (0, -1),
			position + (1, -1),
		].filter { $0.index != nil }
	}

	override func isLegal(on pos: Square.Position) -> Bool {
		guard super.isLegal(on: pos) else {
			return false
		}
		// Do stuff
		return true
	}

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

}