Mackenzie Variation

Morphy Defense the Mackenzie Variation was demonstrated in 1973 in a game of Garry Kasparov vs. Shorat Muratkuliev, 1. e4 , e5 2. Nf3 , Nc6 3. Bb5 , a6
4. Ba4 , Nf6 5. d4 , exd4 5. d4 , exd4 6. e5 , Ne4 7. 0-0 , Be7
Mackenzie Variation for black leaves lots of possibilities for control of the center.

Lots of experienced players gain from a good gambit, giving a pawn , or more, to gain position, nothing like a good sacrifice as long as it achieves its goal.

Interesting views, todays gm s do not have the style of the old gm s . The games tempo and attack strategy are different.

Although it is named after Mackenzie, 5.d4 was played by Morphy, Anderssen, Bird, and others before George Mackenzie started playing it. Here is one of Mackenzie's games.

I have also played 5.d4 many times, with excellent results, but no more.
If Black knows what he is doing (8...0-0), white must work hard to equalize.
Comparative study on counter moves.