How can I handle a touch as a consequence of a previous touch? (Swift, SpriteKit) - swift

Question

This is a chess game in Swift using SpriteKit.
What I would like to happen is for the touched piece to move to the square touched on the next touch. When I run, the piece does not move when I try this. I know for certain that my code works up to and including 'case: "p"', and that the sprite is detecting the first touch.
In the image I've tried to implement this second touch using 'touch2', is this the correct thing to do? Thanks.
This is how I'm detecting the first touch and identifying the piece which has been touched. touchedPiece is the identified piece. moveset is an attribute determining the possible moves.
for touch in touches
{
let location = touch.location(in:self)
let firstTouchedNode = atPoint(location)
let touchedPiece:SKSpriteNode = (firstTouchedNode as? SKSpriteNode)!
switch touchedPiece.moveset {
case "p":
let locationToMove = touch.location(in:self)
let moveto = findpawnmoves(piece: touchedPiece)
spawnMoves(arr: moveto)
And here is the attempt to move the piece after locationToMove has been decided.
if moveto[0].contains(locationToMove){
move(piece: touchedPiece, location: moveto[0].position)
whiteMoved = true
deleteMoves(arr: moveto)
This is an example of how I am creating an array of possible squares to move to. I'll use the knight moves because it's the most concise.
func createMoveNode(piece: SKSpriteNode, up:Int, across:Int) -> SKSpriteNode{
let moveNode = SKSpriteNode(color: .clear, size: CGSize(width: CGFloat(cellsize), height: CGFloat(cellsize)))
moveNode.anchorPoint = CGPoint(x:0.5, y:0.5)
moveNode.position = CGPoint(x: piece.position.x + CGFloat(Double(across)*d), y: piece.position.y + CGFloat(Double(up)*d))
return moveNode
}
func findknightmoves(piece: SKSpriteNode) -> Array<SKSpriteNode>{
let move1 = createMoveNode(piece: piece, up:2, across:-1)
let move2 = createMoveNode(piece: piece, up:2, across:1)
let move3 = createMoveNode(piece: piece, up:-2, across:-1)
let move4 = createMoveNode(piece: piece, up:-2, across:1)
return [move1,move2,move3,move4]
}
func move(piece: SKSpriteNode, location: CGPoint){
piece.position = location
}
func spawnMoves(arr: Array<SKSpriteNode>){
for i in 0...arr.count-1{
arr[i].zPosition = 1
self.addChild(arr[i])
}
}
func deleteMoves(arr: Array<SKSpriteNode>){
for i in 0...arr.count-1{
arr[i].removeFromParent()
}
}