Back in 1983, our instructor had students of a friend of his come to our class to spar. We had done point sparing and boxing sparing, a coach at the same community center was an amateur boxing coach, so his boxers had a lot to teach us. We were willing to spar with any kind of rules. These guys were into Bama Lethwei and Muay Thai. I had only seen little of it. Eastern kickboxing rules, OK! So my first match was against the man who was to be my instructor in many other arts after this time. I took a deep back stance and shuto on guard, (right out of Pinon 2/Hean Nidan) he kinda giggled and put up a high Muay Thai/Lethwei guard. I saw ribs and I threw my best rear leg round roundkick at his ribs, he brought his lead knee up & lead elbow down onto my instep. CRACK! Hurt like hell, he had a **** eating grin on his face and kept his guard high. I followed him around like a Kung Fu Theater disciple, will you be my teacher? Exchanges in sparing skills and rules can be of a benefit to those who want to be more well rounded outside their particular system. PEACE