12 Jan '08 19:02>2 edits
cms has been pimping this 3rd move for white as a finesse to avoid certain black lines. Personally I think it worthless and when my opp in this game played 3. a3?! I thought briefly how to "refute it" before deciding on the Benoni, where the move a3 doesn't make much sense. Note that this was a 5 5 blitz game and that I don't often play the Benoni, so the game is less than stellar, but it illustrates the uselessness (IMHO) of 3. a3:
[Event "FICS rated blitz game"]
[Site "FICS, San Jose, California USA"]
[Date "2008.01.12"]
[Time "10:44:03"]
[Round "-"]
[White "McCammont"]
[Black "scandium"]
[TimeControl "300+5"]
[Mode "ICS"]
[Result "0-1"]
1. d4 Nf6 2. c4 e6 3. a3 c5 4. d5 exd5 5. cxd5 g6 6. Nc3 d6 7. Bg5 Qe7 8. Qd2
Nbd7 9. Nf3 Bg7 10. e3 a6 11. Bd3 b5 12. Ne4 Bb7 13. Nxf6+ Nxf6 14. Bxf6
Bxf6 15. Rb1 O-O 16. e4 Bxd5 17. O-O Bb7 18. Rfe1 c4 19. Bc2 Bg7 20. b3
c3 21. Qd3 Qc7 22. Rbd1 Rad8 23. b4 Rfe8 24. Qf1 a5 25. Rd3 Bxe4 26. Rde3
d5 27. Bxe4 dxe4 28. Rxe4 Rxe4 29. Rxe4 c2 30. Re1 Qf4 31. Rc1 Qxc1
{White resigns} 0-1
[Event "FICS rated blitz game"]
[Site "FICS, San Jose, California USA"]
[Date "2008.01.12"]
[Time "10:44:03"]
[Round "-"]
[White "McCammont"]
[Black "scandium"]
[TimeControl "300+5"]
[Mode "ICS"]
[Result "0-1"]
1. d4 Nf6 2. c4 e6 3. a3 c5 4. d5 exd5 5. cxd5 g6 6. Nc3 d6 7. Bg5 Qe7 8. Qd2
Nbd7 9. Nf3 Bg7 10. e3 a6 11. Bd3 b5 12. Ne4 Bb7 13. Nxf6+ Nxf6 14. Bxf6
Bxf6 15. Rb1 O-O 16. e4 Bxd5 17. O-O Bb7 18. Rfe1 c4 19. Bc2 Bg7 20. b3
c3 21. Qd3 Qc7 22. Rbd1 Rad8 23. b4 Rfe8 24. Qf1 a5 25. Rd3 Bxe4 26. Rde3
d5 27. Bxe4 dxe4 28. Rxe4 Rxe4 29. Rxe4 c2 30. Re1 Qf4 31. Rc1 Qxc1
{White resigns} 0-1