Kyokushin
Under the WKO knockdown rules the bout is settled by strikes: ippon is a technique that vigorously downs the opponent for more than three seconds, and the whole of judo's toolkit is a foul — tsukami (grabbing the dogi or a limb), kakaekomi (hugging and holding) and throws are all listed. Only the foot sweep survives inside the game, because a properly timed downward punch after one scores waza-ari. So the training goes to striking at short range, absorbing contact to the body and legs, and staying upright.