1.e4 e5 2.Nf3 Nc6 3.c3 Nf6 4.d4 Nxe4 5.dxe5!?
There are almost 1,200 examples of 5.d5 in ChessBase's 2019 Mega database, and just 31 of the text. Nevertheless 5.dxe5!? is the older continuation, having first been played by Bernhard Horwitz to beat Lionel Kieseritzky in 1846.
5...Bc5
As against 5.d5, Black can immediately target f2.
How should White meet the threat to f2? |
*****
*****
*****
6.Bc4?
This is RK's idea. He played it in Kearsley (1809) - Richard Wiener (2025), Prague B 2009. After 6...0-0? 7.0-0 d5? 8.Bxd5 Nxf2 9.Rf2, White was considerably better (but 0-1, 31 moves).
However, all this is academic as Black has an obvious and major improvement in ...
6...Nxf2
...when RK's suggested …
7.Qd5
… is comfortably met by …
7...Qe7
The position is not completely clear, but White does not seem to have compensation for his missing pawn, and meanwhile e5 is vulnerable.
Going back to the position after 6.Bc4?, it is not surprising the position is good for Black as it is normally reached with White to move, not Black, from a sequence such as 1.e4 Nc6 2.d4 e5 3.Nf3 Nf6 4.dxe5 Nxe4 5.Bc4 Bb4+ 6.c3 Bc5.
The analysis engines Stockfish10 and Komodo10 reckon that, instead of 6.Bc4?, White should try 6.Qd5 or 6.Be3, but in each case they slightly prefer Black.
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