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The Tartakower Gambit in the bullet point below seems dated, however, as you will see. Finally, here is a game involving the energetic gambit that I spoke about in introducing the 4.d4 variation above. Finally, if white plays 4.d4 followed by 5.0-0, this move order allows for black to play knowing that white is committed to an early d4. Interestingly, the older games tend to involve the early