Just wanted to let folks here know about Yamie Chess, it's a new Harvard/MIT math learning aid based on classic chess that was created by 2-time USA chess champion Jennifer Shahade and a group of math educators. Jeremy Silman also contributed. Their homepage is here: https://www.yamiechess.com
Here is are two videos about it:
It is going to be officially announced at the 2014 American International Toy Fair in New York later this month.