i be rather surprised that no reviewer so far have comment on the rather elementary chess blunder in luzhin game a white against an unnamed opponent immediately before the final . despite the use of jonathan speelman a consultant chess expert and luzhin be show win the game with an illegal move . in between the rapid cut away and back to the board it be not hard to spot that after luzhin combination culminate in a queen sacrifice and his rook on d1 be still pin by black rook at c1 against his king in the corner at h1 . thus he be unable to play the purported mating move rd1 d8 which would be illegal but he show do so to rapturous applause from the audience .