In 1973, four-year-old Susan opened the cupboard of their guest room and saw many chess pieces fell out of a small bag. Just next to them was a rolled-up chess mat. She took the mat out and looked at the pieces with the intrigue comparable to any other child of her age. 

“What are these, Mummy?” Susan asked innocently, holding a piece in her hand and examining it.

“These are chess pieces, Zsuzsa,” she said, careful to not sound too enthusiastic, worried it might just kill Susan’s excitement. When parents are too excited to introduce somet...