The Grunfeld Formula

The story goes that a low-rated player once bravely asked Viktor Korchnoi his advice about what opening to play against a stronger opponent. “Play Grünfeld” was the grumpy reply. “Play Grünfeld against everything apart from 1 e4.” I have no way of verifying this story, but it certainly inspired me to think about whether this was possible and the end result is this new ChessBase course.