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Try and block the opposition while making a smart move to take you one step closer to making a square yourself. It is important to remember that you only need a square or triangle in the corners of what would become your square, try and think about it that way, it helps you see the possible squares more easily. First of all, change the grid size to 8. Place three squares, one on top of the other, to make a straight line. This can be horizantally, diagonally or vertically. Then place another symbol adjacent to the square in the middle of the existing line, this can be on the left or right, it does not affect the method. If your opponent tries to block you by adding a square adjacent to the top square of the line, on the same side that you added a square on to the middle, you can still win in your next go as you have two possible squares you could make. You could place a square next to the bottom square, again on the same side that the other squares have been places. This is the same vise versa. This particular method ensures that you will make a square before your opponent and win.