[%c_effect d5;square;d5;type;Interesting;persistent;true] A fresh idea, although not a novelty.
1. e2e4  1... e7e5  2. g1f3  2... g8f6  3. d2d4  3... f6e4  4. d4e5  4... f8c5  5. f1c4 [%c_effect c4;square;c4;type;GreatFind;persistent;true] The most dangerous move, although 7.Qd5 is also possible. 5... e4f2  6. c4f7  6... e8f7  7. d1d5  7... f7g6  8. d5c5  8... f2h1  9. b1c3 A strange position, which has already been debated in some important games. At the moment, Black has an extra rook, but the knight on h1 will be captured at some point and the king is in danger. As normally happens, the advantages are equivalent and the position is equal. 9... h7h6 Giving a much-needed square for the king on h7.