Dr. Alexey Root had Greenhill School chess students try the Game Theory challenge from Thinking with Chess: Teaching Children Ages 5-14. The beginners were not required to notate, so they were able to complete both the kingside and queenside castling versions of the challenge.

The intermediate and advanced were required to notate, and to demonstrate (by replaying their notation for Dr. Root) their kingside challenges. Thus they realized one important aspect of notation: It’s evidence of what was played.