I'm with Mary on this, this is tacking too close. If you're only halfway through your tack, even if the other boat is clear behind when you started tacking, they have to maneuver to avoid and you've fouled them.

The other very useful maneuver is to really pinch high as soon as you're close to the mark. You can use it as a "pick" and tack when you get to the other side. You're basically tacking around the mark. It's unlikely that the other boat would chase you, they would just sail their normal course and tack when they hit the layline.

Mike