Boonlai Sor Thanikul vs Ole Kiatoneway (video)

Here is an incredible bout between two legends.

You may want to pay attention to each fighters footwork. Neither ever cross their legs or ever lose the "triangle" in their stance, even when moving.
Particularly Ole (in the blue shorts) will step forward with his rear leg and drop into his opposite stance (the foot work we call horse).  Advanced students may note the body and techniques lines up with his opponent's when he does so.