22.676 games played between February and April 2018. For Adrian Mikhalchishin the Grünfeld Defence is at the moment the most difficult opening in modern chess. Complicated positions often appear on the board and Black achieves his first goal: obtaining counterplay. For White, the question is whether to play main lines or whether to prefer turning to a promising sub-variation which he has prepared thoroughly. Yet another option consists of the choice of a classical plan. The variation with the fianchetto and an early e4 goes back to Rubinstein, but, as the sample game from our Ukrainian top trainer proves, this setup has lost none of its venom.