1. e2e4  1... c7c6  2. d2d4  2... d7d5  3. f2f3 [%c_effect f3;square;f3;type;Interesting;persistent;true] This move is a popular sideline in the Caro-Kann Defense. Very strong players choose it from time to time. 3... e7e6  4. b1c3  4... b8d7 The fourth most popular move. 5. c1e3  5... f8b4  6. f1d3  6... c6c5 An interesting move. Good chances of equality are offered by the more conventional 7. e4d5 