context: 1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. b1c3  3... g8f6  4. f1b5 The Four Knights is back in the spotlight. 4... c6d4 Rubinstein's beloved move, which is now considered Black's most solid choice. 5. e1g1  5... c7c6  6. b5d3  6... d4f3 