Explanation for the bishop model,
THe link to provided in the task description led me to a google search , the first pic had a slight slant cut and i was inspired and i already have done the modelling task #1 of 2 , in which i  liked the torroid made so i used it twice to make curve . Then i experimented and found perefect shapes for head , later on i foind something missing and added a circular belt in between and the top sphere. and this way i made the bishop chess model