comment: A tabiya for the system. In an ideal world White is preparing Nd4-b3 and the advance of the a-pawn, when c4-c5 will follow.
context: 1. e2e4  1... c7c5  2. g1f3  2... e7e6  3. d2d4  3... c5d4  4. f3d4  4... a7a6 The flexible Kan Sicilian... 5. c2c4 ...which will soon turn into a Hedgehog. 5... g8f6  6. b1c3  6... d8c7  7. a2a3  7... b7b6  8. c1e3  8... c8b7  9. f2f3  9... f8e7  10. f1e2  10... d7d6  11. e1g1  11... e8g8  12. a1c1  12... b8d7 