It depends.If Ruizhan is planning train with non mainstream opening to improve his understanding of opening theories, then it is good in the long term as he would be able to play better against opponents who play horse or elephant openings. But if he plans to play 单提马 in the competition two months later, then it would be a risk to take. We all know that 单提马 is a defensive opening and it does not suit ruizhan's attacking style. Moreover, two months is too short to convert an attacking style to defensive style.