Wesley's 9.a3 is a rare line. It was is so rare that according to Chessgames.com, it was played just once:[Event "Buenos Aires"][Date "1964.??.??"][Round "1"][White "Miroslav Filip"][Black "Herman Pilnik"][ECO "A56"]1.d4 Nf6 2.c4 c5 3.d5 e5 4.Nc3 d6 5.e4 Be7 6.Be2 Nbd7 7.Nf3 a6 8.O-O O-O 9.a3 Rb8 10.b4 Ne8 11.Rb1 b6 12.Be3 g6 13.Qd2 Rb7 14.Bd1 Ng7 15.Bh6 Rc7 16.Be2 Nf6 17.bxc5 bxc5 18.Qc2 Ng4 19.Bd2 f5 20.Rb8 Nf6 21.Rfb1 Nxe4 22.Nxe4 fxe4 23.Qxe4 Bf5 24.Rxd8 Bxd8 25.Qe3 Bxb1 26.Qb3 Bf5 27.Qb6 Ne8 28.Ng5 Bxg5 29.Bxg5 Bc8 30.Qb8 Kf7 31.Bd8 Rd7 32.Qxc8 Nf6 33.Bg4 Rdxd8 34.Be6+ Kg7 35.Qxa6 h5 36.h4 Ne4 37.f3 Nf6 38.Qb7+ Kh8 39.Qe7 e4 40.Bf7 Ng8 41.Bxg8 Kxg8 42.Qxe4 Kh7 43.Qe7+ Kh6 44.a4 Rfe8 45.Qc7 g5 46.hxg5+ Kxg5 47.a5 Kf6 48.a6 Rg8 49.Kf2 h4 50.a7 Ke5 51.Ke3 Kf5 52.Kf2 Ke5 53.Ke3 Kf5 54.Kd3 Kf4 55.a8=Q Rxa856.Qxd6+ Kf5 57.Qd7+ Ke5 58.Qe7+ Kf5 59.Qe4+ 1-0
[Event "New York"][Date "1988.??.??"][White "Garry Kasparov"][Black "Stuart Rachels"][ECO "A56"]1.d4 Nf6 2.c4 c5 3.d5 d6 4.Nc3 g6 5.e4 Bg7 6.Bd3 O-O 7.Nge2 e6 8.O-O exd5 9.cxd5 a6 10.a4 Qc7 11.h3 Nbd7 12.f4 Rb8 13.Be3 Re8 14.Ng3 c4 15.Bc2 Nc5 16.Qf3 b5 17.axb5 axb5 18.e5 dxe5 19.fxe5 Rxe5 20.Bd4 b4 21.Bxe5 Qxe5 22.Rae1 Qd4+ 23.Kh1 Bxh3 24.Nce2 Qxb2 25.Qf4 Rc8 26.Bb1 Bd7 27.Nd4 Rf8 28.Nf3 c3 29.Qd6 Nb330.Ne5 Bb5 31.Rxf6 Bxf6 32.Qxf6 c2 33.Nf5 gxf5 34.Qg5+ Kh8 35.Qh6 Kg8 36.Bxc2 Qxc2 37.Re3 f4 38.Qxf4 Qc1+ 39.Kh2 f6 40.Rg3+ Kh8 41.Nf7+ Rxf7 42.Qb8+ 1-0
[Event "$5 million match"][Date "1992.??.??"][White "Boris Spassky"][Black "Robert James Fischer"][ECO "A56"]1. d4 Nf6 2. c4 c5 3. d5 d6 4. Nc3 g6 5. e4 Bg7 6. Bg5 h6 7. Bh4 g5 8. Bg3 Qa5 9. Bd3 Nxe4 10. Bxe4 Bxc3+ 11. bxc3 Qxc3+ 12. Kf1 f5 13. Rc1 Qf6 14. h4 g4 15. Bd3 f4 16. Ne2 fxg3 17. Nxg3 Rf8 18. Rc2 Nd7 19. Qxg4 Ne5 20. Qe4 Bd7 21. Kg1 O-O-O 22. Bf1 Rg8 23. f4 Nxc4 24. Nh5 Qf7 25. Qxc4 Qxh5 26. Rb2 Rg3 27. Be2 Qf7 28. Bf3 Rdg8 29. Qb3 b6 30. Qe3 Qf6 31. Re2 Bb5 32. Rd2 e5 33. dxe6 Bc6 34. Kf1 Bxf3 0-1
[Event "Tallinn"][Site "9"][Date "1973.??.??"][White "Jan Timman"][Black "Mikhail Tal"][ECO "A56"]1.d4 Nf6 2.c4 c5 3.d5 g6 4.Nc3 Bg7 5.e4 d6 6.Nf3 O-O 7.Be2 e5 8.O-O Ne8 9.Ne1 Nd7 10.Nd3 f5 11.f4 Qe7 12.exf5 gxf5 13.Kh1 e4 14.Nf2 Bxc3 15.bxc3 Ndf6 16.Be3 Kh8 17.h3 Rg8 18.Qd2 Ng7 19.Nd1 Ngh5 20.Bxh5 Nxh5 21.Bf2 Bd7 22.Be1 Raf8 23.Ne3 Qf624.Kh2 Qh6 25.g3 Rf6 26.Rg1 Rfg6 27.Rg2 Nxf4 28.gxf4 Qxf4+ 29.Kg1 Qf3 30.Qf2 Qxh3 31.Rb1 f4 32.Rb2 f3 0-1
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Wesley's 9.a3 is a rare line. It was is so rare that according to Chessgames.com, it was played just once:
[Event "Buenos Aires"]
[Date "1964.??.??"]
[Round "1"]
[White "Miroslav Filip"]
[Black "Herman Pilnik"]
[ECO "A56"]
1.d4 Nf6 2.c4 c5 3.d5 e5 4.Nc3 d6 5.e4 Be7 6.Be2 Nbd7 7.Nf3 a6 8.O-O O-O 9.a3 Rb8 10.b4 Ne8 11.Rb1 b6 12.Be3 g6 13.Qd2 Rb7 14.Bd1 Ng7 15.Bh6 Rc7 16.Be2 Nf6 17.bxc5 bxc5 18.Qc2 Ng4 19.Bd2 f5 20.Rb8 Nf6 21.Rfb1 Nxe4 22.Nxe4 fxe4 23.Qxe4 Bf5 24.Rxd8 Bxd8 25.Qe3 Bxb1 26.Qb3 Bf5 27.Qb6 Ne8 28.Ng5 Bxg5 29.Bxg5 Bc8 30.Qb8 Kf7 31.Bd8 Rd7 32.Qxc8 Nf6 33.Bg4 Rdxd8 34.Be6+ Kg7 35.Qxa6 h5 36.h4 Ne4 37.f3 Nf6 38.Qb7+ Kh8 39.Qe7 e4 40.Bf7 Ng8 41.Bxg8 Kxg8 42.Qxe4 Kh7 43.Qe7+ Kh6 44.a4 Rfe8 45.Qc7 g5 46.hxg5+ Kxg5 47.a5 Kf6 48.a6 Rg8 49.Kf2 h4 50.a7 Ke5 51.Ke3 Kf5 52.Kf2 Ke5 53.Ke3 Kf5 54.Kd3 Kf4 55.a8=Q Rxa8
56.Qxd6+ Kf5 57.Qd7+ Ke5 58.Qe7+ Kf5 59.Qe4+ 1-0
[Event "New York"]
[Date "1988.??.??"]
[White "Garry Kasparov"]
[Black "Stuart Rachels"]
[ECO "A56"]
1.d4 Nf6 2.c4 c5 3.d5 d6 4.Nc3 g6 5.e4 Bg7 6.Bd3 O-O 7.Nge2 e6 8.O-O exd5 9.cxd5 a6 10.a4 Qc7 11.h3 Nbd7 12.f4 Rb8 13.Be3 Re8 14.Ng3 c4 15.Bc2 Nc5 16.Qf3 b5 17.axb5 axb5 18.e5 dxe5 19.fxe5 Rxe5 20.Bd4 b4 21.Bxe5 Qxe5 22.Rae1 Qd4+ 23.Kh1 Bxh3 24.Nce2 Qxb2 25.Qf4 Rc8 26.Bb1 Bd7 27.Nd4 Rf8 28.Nf3 c3 29.Qd6 Nb3
30.Ne5 Bb5 31.Rxf6 Bxf6 32.Qxf6 c2 33.Nf5 gxf5 34.Qg5+ Kh8 35.Qh6 Kg8 36.Bxc2 Qxc2 37.Re3 f4 38.Qxf4 Qc1+ 39.Kh2 f6 40.Rg3+ Kh8 41.Nf7+ Rxf7 42.Qb8+ 1-0
[Event "$5 million match"]
[Date "1992.??.??"]
[White "Boris Spassky"]
[Black "Robert James Fischer"]
[ECO "A56"]
1. d4 Nf6 2. c4 c5 3. d5 d6 4. Nc3 g6 5. e4 Bg7 6. Bg5 h6 7. Bh4 g5 8. Bg3 Qa5 9. Bd3 Nxe4 10. Bxe4 Bxc3+ 11. bxc3 Qxc3+ 12. Kf1 f5 13. Rc1 Qf6 14. h4 g4 15. Bd3 f4 16. Ne2 fxg3 17. Nxg3 Rf8 18. Rc2 Nd7 19. Qxg4 Ne5 20. Qe4 Bd7 21. Kg1 O-O-O 22. Bf1 Rg8 23. f4 Nxc4 24. Nh5 Qf7 25. Qxc4 Qxh5 26. Rb2 Rg3 27. Be2 Qf7 28. Bf3 Rdg8 29. Qb3 b6 30. Qe3 Qf6 31. Re2 Bb5 32. Rd2 e5 33. dxe6 Bc6 34. Kf1 Bxf3 0-1
[Event "Tallinn"]
[Site "9"]
[Date "1973.??.??"]
[White "Jan Timman"]
[Black "Mikhail Tal"]
[ECO "A56"]
1.d4 Nf6 2.c4 c5 3.d5 g6 4.Nc3 Bg7 5.e4 d6 6.Nf3 O-O 7.Be2 e5 8.O-O Ne8 9.Ne1 Nd7 10.Nd3 f5 11.f4 Qe7 12.exf5 gxf5 13.Kh1 e4 14.Nf2 Bxc3 15.bxc3 Ndf6 16.Be3 Kh8 17.h3 Rg8 18.Qd2 Ng7 19.Nd1 Ngh5 20.Bxh5 Nxh5 21.Bf2 Bd7 22.Be1 Raf8 23.Ne3 Qf6
24.Kh2 Qh6 25.g3 Rf6 26.Rg1 Rfg6 27.Rg2 Nxf4 28.gxf4 Qxf4+ 29.Kg1 Qf3 30.Qf2 Qxh3 31.Rb1 f4 32.Rb2 f3 0-1
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