Tweaking Ancient Games

This post is about one of my iterations for the Ancient Game I'm tweaking called Tablut. Originally when I played this game i noticed a major bug, that is if the attacking side just moves their pieces to surround the escaping tile for the king then the king cant escape and the defending side cant stop them from doing this.

So my iterations is going to hopefully stop this from happening what i am going to do is, the corner tiles are where the king can escape, I'm going to make the to adjacent tiles horizontally and vertically be inaccessible to the attacking side so they cannot block the path for the king for ever.