Use both hands to hold around the opponent's neck, bend the Opponents head down to the front then bend both legs to in order to bend the knees to the opponent chin or chest.

To protect
Put both elbows close together to the front then try to strike the elbows to the opponent's thighs strongly.

To counter
Insert the arm in circle and hold the head up, then counter by kneeing or pushing the crossed knee to the abdomen. Another trick is pushing the hand to the opponent's chin and thrusting a power full hand at the same time as the opponent throws the knee. The opponent may be fall back down.