uares[i].length) {
            if(mySquares[i][j + 2] == 3) {
                mySquares[i][j + 2] = 2;
                int[] newSquare = new int[2];
                newSquare[0] = i;
                newSquare[1] = j + 2;
                possibleSquares.addElement(newSquare);
            } else if(mySquares[i][j + 2] == 1) {
                links[2*linkCount] = i;
                links[2*linkCount + 1] = j + 1;
                linkCount++;
            }
        }
        if(j >= 3) {
            if(mySquares[i][j - 2] == 3) {
                mySquares[i][j - 2] = 2;
                int[] newSquare = new int[2];
                newSquare[0] = i;
                newSquare[1] = j - 2;
                possibleSquares.addElement(newSquare);
            } else if(mySquares[i][j - 2] == 1) {
                links[2*linkCount] = i;
                links[2*linkCount + 1] = j - 1;
                linkCount++;
            }
        }
        if(i + 3 <= mySquares.length) {
            if(mySquares[i + 2][j] == 3) {
                mySquares[i + 2][j] = 2;
                int[] newSquare = new int[2];
                newSquare[0] = i + 2;
                newSquare[1] = j;
                possibleSquares.addElement(newSquare);
            } else if(mySquares[i + 2][j] == 1) {
                links[2*linkCount] = i + 1;
                links[2*linkCount + 1] = j;
                linkCount++;
            }
        }
        if(linkCount > 0) {
            int linkChoice = getRandomInt(linkCount);
            int linkX = links[2*linkChoice];   int linkY = links[2*linkChoice + 1];
            mySquares[linkX][linkY] = 1;
            int[] removeSquare = new int[2];
            removeSquare[0] = linkX;
            removeSquare[1] = linkY;
            possibleSquares.removeElement(removeSquare);
        }
    }
   
    /**
     * a randomization utility.
     * @param upper the upper bound for the random int.
     * @return a random non-negative int less than the bound upper.
     */
    public int getRandomInt(int upper) {
        int retVal = myRandom.nextInt() % upper;
        if(retVal < 0) {
            retVal += upper;
        }
        return(retVal);
    }
   
}
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