 <p>this.x and this.y are functional from the scope of your checkers pieces object; however, if you're accessing a piece outside of their scope, you must use a piece's instance name. Although not optimal, you could loop through children DisplayObjects.</p> <pre><code>// create a collection of your checker pieces var checkers:Array = []; // create a checker piece, whatever your DisplayObject class is. var checker:Checker; checkers.push(checker); // add it to the stage, probably your game board addChild(checker); checker.x = 100; checker.y = 100; // loop through the children (from your game board) for (var i:uint = 0; i &lt; numChildren; i++) { var checker:DisplayObject = getChildAt(i); trace(checker.x); trace(checker.y); } </code></pre> <p>Using coordinates to reference a piece may not be optimal for game play. You might want to consider a row / column or approach it from how your game board works.</p> <p>If this is not clear, you should specify some code or expand your question with more detail.</p>