[%c_effect d7;square;d7;type;Interesting;persistent;true] A rare move, involving a pawn sacrifice, that took Keymer by surprise. It's difficult to say whether this move was prepared in the laboratory or not.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. e2e3  4... e8g8  5. f1d3  5... d7d5  6. c4d5  6... e6d5  7. g1e2  7... f8e8  8. e1g1 