Not so sure
Im not much of a chess player (which is why I got this), but a couple of examples in the tutorials make me question their expertise. One early diagram shows a knight attacking like a pawn. And then, according to their own definition of "double attack" they dont then show any double attacks, only more forks (but from bishops and rooks instead of knights and pawns).
Olclops about
Chess Academy for Kids by Geek Kids