c.set_white(c0.white() + c1.white());
c.set_draw(c0.draw() + c1.draw());
c.set_black(c0.black() + c1.black());
+ c.set_computer(c0.computer() + c1.computer());
c.set_sum_white_elo(c0.sum_white_elo() + c1.sum_white_elo());
c.set_sum_black_elo(c0.sum_black_elo() + c1.sum_black_elo());
c.set_num_elo(c0.num_elo() + c1.num_elo());