Flixel overlap

/// PLAYSTATE ////
class PlayState extends FlxState
{
    var _testPice: Pice;
    var _testPice2: Pice;
    var _testPice3: Pice;

    override public function create()
    {
        super.create();

        _testPice = new Pice(0, 0, 1);
        _testPice2 = new Pice(0, 1, 2);
        _testPice3 = new Pice(1, 0, 1);

        add(_board);
        add(_testPice3);
        add(_testPice2);
        add(_testPice);

        Reg.boardData.add(_testPice);
        Reg.boardData.add(_testPice2);
        Reg.boardData.add(_testPice3);
    }

    override public function update(elapsed:Float)
    {
        super.update(elapsed);
    }

}

//////// PICE Class ////
class Pice extends FlxSpriteGroup
{
    ////// THIS IS THE PROPERTY AND IS PUBLIC
    public var player: Int;

    // Elements of the full pice
    public var pice: FlxExtendedSprite;

    public function new(?X:Int = 0, ?Y:Int = 0, ?Player:Int = 1)
    {
        super(X, Y, 0);

        // Sets pice position on board
        super(X * Config.PICE_SIZE, Y * Config.PICE_SIZE);

        // Identifier, player and type of pice
        player = Player; ///////HERE ITs

        // Load sprite for the pice
        pice = new FlxExtendedSprite(0, 0);
        pice.loadGraphic('assets/images/pice__f.jpg', false, Config.PICE_SIZE, Config.PICE_SIZE);

        /// Colors the pice depending on the player
        if (player == 1) {
            pice.color = FlxColor.fromRGB(184, 111, 60, 0);
        } else if (player == 2) {
            pice.color = FlxColor.fromRGB(235, 202, 163, 0);
        }

        //Adds objets to the group
        add(pice);
    }


//////// PiceMove Classs WHERE THE OVERLAP IS CHECKED ////
class PiceMove extends FlxExtendedSprite
{
    var pice:Pice;
    var isOverlaping:Bool;

    public function new(X:Float = 0, Y:Float = 0, Face: String,  ParentPice: Pice)
    {
        super(X * Config.PICE_SIZE, Y * Config.PICE_SIZE);

        pice = ParentPice;

        loadGraphic(AssetPaths.move__png, false, Config.PICE_SIZE, Config.PICE_SIZE);
    }

    override public function update(elapsed:Float)
    {
        super.update(elapsed);
        isOverlaping = FlxG.overlap(this, Reg.boardData, onOverlap);
    }

    private function onOverlap(object1, object2:Pice) {
        FlxG.log.add(object1.pice.player);
        FlxG.log.add(object2.player);

        object2.kill();
    }

}