Read the following statement.

Ivan's chess skills were so great that finding challengers proved difficult.

Which two sentences from the passage best support this idea?

It also made Ivan upset, who finally saw the fun in chess again, but could find little competition save for Cammie, but she had quit chess for softball.
He left Ivan alone as his son studied and watched the others.
It turned out that Ivan was a natural at chess, which made his father burst with joy, but Ivan just was not as interested in chess.
In doing so, he had to stay away from chess competitions, but now he found a pupil worthy of his knowledge.
At the next event—Ivan's first—he crushed everyone without so much as a game of practice.