It is good to discuss the emotions, even what an adult feels, with the child.

What feeling does one get when winning? When losing? When tried so many times and still not winning/doing well?

What can we do when one is feeling that way?
How can we catch ourselves when we start to feel that way? What would you like to choose to do when that happens, etc.?

What if I'm not able to catch myself this time from getting very frusterated, is it ok? Should I try again next time?

etc etc
smile