Euwe vs Davidson 1921: A must-know game for defending QP games.
This game occurred in Holland in 1921. Young Max Euwe played aggressively against Dutch master Jacques Davidson when they met in The Hague. their game is key for knowing how to handle the big Pawn center that can result if Black offers to transpose into a Queen's Indian on move 3 with this move order: 1.d4 Nf6 2.c4 e6 3.Nc3 b6!? 4.e4.
I will sometimes invite a Queen's Indian on move 3 if I'm not in the mood to defend certain systems in the QGD, including the Exchange variation and the lines that feature Bf4 (instead of Bg5), so this game is important for my repertoire.