Your friend recently entered a few chess competitions, but lost them all really badly. if he has an entity theory of self, what is he most likely to do

If the individual has entity theory, then it means that he or she has the thought or belief that his or her knowledge about things are unchangeable in a way that they are built that way and are already fixed. If the individual has lost the chess game and he has the entity theory, he would probably think that he has bad genes when it comes to playing chess. 

That is true , instead try to have a sit down talk with them