6 - when he comes in close (tsuba-za-reai?), let go of your shinai and grap the bottom of his Do. Ram it up into his jaw. When he starts to fall backwards put your other hand behind his lower back and push him down going over your hand. When he is down (and probably winded) take his shinai and batter the bajaysus out of him. When the refs intervene just say you are doing old school kendo rather than the wussy stuff you guys do now.