One reason why 6 Bg5 is beginning to plummet in the popularity stakes is the Delayed Poisoned Pawn Variation, 6...e6 7 f4 h6 8 Bh4 Qb6:
White is really struggling to show anything here and 9 Qd2 Qxb2 10 Rb1 Qa3 11 e5 dxe5 12 fxe5 Nd5 just seems to lead to an unbalanced but fairly level endgame as we've seen on several occasions.
To my surprise a young Dutch star went in for it in Giri-Popilsky, but never obtained any advantage whatsoever.
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