On Johnson's 4.f4:The main line is 4.Nf3 as played by Spassky vs Fischer in World Championship 1972, and many others including our very own Wesley So vs Dzumaev in Vietnam 2008.
[Event "1st Dragon Capital Vietnam Open"][Date "2008.09.01"][White "Wesley So"][Black "Marat Dzhumaev"][ECO "B04"][WhiteElo "2577"][BlackElo "2549"]1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bf5 5. Bd3 Bxd3 6. Qxd3Nc6 7. Qb3 e6 8. exd6 Qxd6 9. O-O O-O-O 10. Rd1 Nf4 11. Nc3 g512. Bxf4 Qxf4 13. d5 Nb4 14. dxe6 Bc5 15. Ne2 Qf6 16. Qc4 g417. Nfd4 Bd6 18. exf7 Nd5 19. Nb5 Qxf7 20. Nec3 Qf4 21. Nxd6+Qxd6 22. Rxd5 1-0
[Event "Amber Tournament (Blindfold)"][Site "Nice FRA"][Date "2008.03.22"][White "Viswanathan Anand"][Black "Magnus Carlsen"][ECO "B04"][WhiteElo "2799"][BlackElo "2733"]1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 dxe5 5. Nxe5 c6 6. Be2 Nd77. Nf3 N7f6 8. O-O Bf5 9. Nh4 Bg6 10. c4 Nb6 11. Nc3 e6 12. g3Be7 13. Be3 Qc7 14. Nxg6 hxg6 15. Qb3 Rd8 16. Rfd1 O-O17. Rac1 e5 18. d5 Nbd7 19. Bf3 Bc5 20. Bxc5 Nxc5 21. Qa3 b622. b4 e4 23. Be2 Nb7 24. Qxa7 Ra8 25. d6 Rxa7 26. dxc7 Rc827. c5 bxc5 28. b5 cxb5 29. Nxb5 Rxa2 30. Bf1 g5 31. Ra1 Rxa132. Rxa1 Nd8 33. cxd8=Q+ Rxd8 34. Nc3 e3 35. f3 g4 36. f4 g537. fxg5 Nh7 38. Ne4 Re8 39. Bg2 Kg7 40. Kf1 e2+ 41. Ke1 Re542. Rc1 Nxg5 43. Rxc5 Rxc5 44. Nxc5 f5 45. Kxe2 Kf6 46. Ke3Nf7 47. Nd3 1-0
[Event "Morelia-Linares"][Date "2008.02.20"][White "Veselin Topalov"][Black "Magnus Carlsen"][ECO "B04"]1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 dxe5 5.Nxe5 c6 6.Bd3 Nd77.Nxd7 Bxd7 8.O-O g6 9.Nd2 Bg7 10.Nf3 O-O 11.Re1 Bg4 12.c3 c513.Be4 cxd4 14.cxd4 e6 15.Qb3 Bxf3 16.Bxf3 Bxd4 17.Bxd5 Qxd518.Qxd5 exd5 19.Rd1 Bg7 20.Kf1 Rfd8 21.Bg5 Rd7 22.Rd2 h623.Be3 d4 24.Rd3 Rc8 25.Bd2 Rc2 26.Rb1 Re7 27.a4 f5 28.b3 Rec729.Be1 Kf7 30.Rd2 Rc1 31.Rxc1 Rxc1 32.Ke2 Rb1 33.Rd3 Ke6 34.h4Kd5 35.Bd2 Ke4 36.Rg3 f4 37.Rd3 Be5 38.f3+ Kd5 39.Be1 Bd640.Bd2 g5 41.hxg5 hxg5 42.Be1 g4 43.fxg4 Ke4 44.g5 0-1
[Event "Russian Championship Superfinal"][Date "2009.12.24"][White "Alexander Grischuk"][Black "Alexander Riazantsev"][ECO "B04"][WhiteElo "2736"][BlackElo "2661"]1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 dxe5 5. Nxe5 g6 6. Bc4 Be67. O-O Bg7 8. Re1 O-O 9. Nd2 Nd7 10. Nef3 N7f6 11. Rxe6 fxe612. Ng5 Qd6 13. Qe1 b5 14. Bb3 a5 15. a4 bxa4 16. Nc4 Qc617. Rxa4 Ra6 18. Rxa5 Rfa8 19. Bd2 Bh6 20. h4 Bxg5 21. hxg5Nd7 22. Rxa6 Qxa6 23. Na5 c5 24. Ba4 Ra7 25. Bxd7 Rxd726. dxc5 Nc7 27. c4 Qa8 28. c6 Rd3 29. Bc3 Qf8 30. Qe5 Rd1+31. Kh2 1-0
However, 4.f4 is not a blunder nor a bad move, it is a favorite of GM Victor Kupreichik.
[Event "Moscow PCA-op"][Date "1994.??.??"][White "Viktor Kupreichik"][Black "Simen Agdestein"][ECO "B03"]1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.f4 g6 5.Bc4 Be6 6.Bb3 a5 7.c4 Nb68.c5 dxc5 9.Bxe6 fxe6 10.dxc5 Qxd1+ 11.Kxd1 Na4 12.Be3 Na613.c6 Nxb2+ 14.Ke2 b5 15.Nd2 Nb4 16.Ngf3 Nd5 17.Nd4 Nc3+18.Kf3 Bh6 19.Ne4 Nd5 20.Nxe6 Nc4 21.Bc1 Ra6 22.Rd1 Rxc623.Rxd5 Rxe6 24.Rxb5 O-O 25.Kg3 g5 26.Nxg5 Bxg5 27.fxg5 Rxe528.Rxe5 Nxe5 29.Bf4 Nc4 30.Rc1 Nd6 31.Rxc7 Ne4+ 32.Kg4 Nf2+33.Kf3 Nd3 34.g3 e5 35.Ke3 Nxf4 36.gxf4 Rxf4 37.Rc5 Ra438.Rxe5 Rxa2 39.h4 a4 40.Ra5 a3 41.Kf3 Ra1 42.Kg4 Rb1 43.Rxa3Rb6 44.Ra7 h6 45.Kh5 hxg5 46.hxg5 Rb1 1/2-1/2
[Event "Nice"][Date "1994.??.??"][White "Viktor Kupreichik"][Black "Ljubivoje Perunovic"][ECO "B03"]1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.f4 g6 5.Bc4 Nb6 6.Bb3 Bg7 7.a4 a58.Nf3 O-O 9.O-O Bg4 10.h3 Bxf3 11.Qxf3 d5 12.f5 gxf5 13.Qxf5Qd7 14.Qh5 Qe6 15.Nc3 c6 16.Bg5 N8d7 17.Rae1 Rae8 18.Qh4 Nc819.Bd2 Qg6 20.Ne2 b6 21.Rf3 Kh8 22.Rg3 Qe6 23.Rxg7 Kxg7 24.Nf4Qf5 25.g4 1-0
[Event "Dortmund op"][Date "1991.??.??"][White "Viktor Kupreichik"][Black "Tibor Karolyi Jr."][ECO "B03"]1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.f4 dxe5 5.fxe5 c5 6.Nf3 Bf5 7.Bb5+Nc6 8.c4 Nc7 9.Bxc6+ bxc6 10.Nc3 e6 11.Qa4 Qd7 12.Be3 cxd413.Nxd4 c5 14.Ndb5 Nxb5 15.Nxb5 O-O-O 16.O-O Be7 17.b4 cxb418.c5 Bc2 19.Qa6+ 1-0
[Event "Prag"][Date "1990.??.??"][White "Viktor Kupreichik"][Black "Kestutis Kaunas"][ECO "B03"]1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.f4 Bf5 5.Nf3 e6 6.Bd3 Bxd3 7.Qxd3c5 8.O-O Nc6 9.c3 dxe5 10.fxe5 Be7 11.dxc5 Bxc5+ 12.Kh1 Nce713.Qe2 Nf5 14.Nbd2 h5 15.Ne4 Qb6 16.Bf4 O-O-O 17.a4 Be3 18.Bg5Bxg5 19.Nexg5 Rd7 20.a5 Qe3 21.Qc4+ Kb8 22.a6 Qb6 23.axb7 Kxb7 24.Qe4 Rhd8 25.b4 Qe3 26.b5 Qxe4 27.Nxe4 Kc7 28.Nc5 Kb629.Nxd7+ Rxd7 30.c4 Nde7 31.Rfc1 Kc5 32.Ng5 Ng6 33.Ne4+ Kb4 34.Rab1+ Ka3 35.c5 Nxe5 36.b6 axb6 37.cxb6 Ne7 38.Rc7 Rd8 39.Ra7+ 1-0
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On Johnson's 4.f4:
The main line is 4.Nf3 as played by Spassky vs Fischer in World Championship 1972, and many others including our very own Wesley So vs Dzumaev in Vietnam 2008.
[Event "1st Dragon Capital Vietnam Open"]
[Date "2008.09.01"]
[White "Wesley So"]
[Black "Marat Dzhumaev"]
[ECO "B04"]
[WhiteElo "2577"]
[BlackElo "2549"]
1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bf5 5. Bd3 Bxd3 6. Qxd3
Nc6 7. Qb3 e6 8. exd6 Qxd6 9. O-O O-O-O 10. Rd1 Nf4 11. Nc3 g5
12. Bxf4 Qxf4 13. d5 Nb4 14. dxe6 Bc5 15. Ne2 Qf6 16. Qc4 g4
17. Nfd4 Bd6 18. exf7 Nd5 19. Nb5 Qxf7 20. Nec3 Qf4 21. Nxd6+
Qxd6 22. Rxd5 1-0
[Event "Amber Tournament (Blindfold)"]
[Site "Nice FRA"]
[Date "2008.03.22"]
[White "Viswanathan Anand"]
[Black "Magnus Carlsen"]
[ECO "B04"]
[WhiteElo "2799"]
[BlackElo "2733"]
1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 dxe5 5. Nxe5 c6 6. Be2 Nd7
7. Nf3 N7f6 8. O-O Bf5 9. Nh4 Bg6 10. c4 Nb6 11. Nc3 e6 12. g3
Be7 13. Be3 Qc7 14. Nxg6 hxg6 15. Qb3 Rd8 16. Rfd1 O-O
17. Rac1 e5 18. d5 Nbd7 19. Bf3 Bc5 20. Bxc5 Nxc5 21. Qa3 b6
22. b4 e4 23. Be2 Nb7 24. Qxa7 Ra8 25. d6 Rxa7 26. dxc7 Rc8
27. c5 bxc5 28. b5 cxb5 29. Nxb5 Rxa2 30. Bf1 g5 31. Ra1 Rxa1
32. Rxa1 Nd8 33. cxd8=Q+ Rxd8 34. Nc3 e3 35. f3 g4 36. f4 g5
37. fxg5 Nh7 38. Ne4 Re8 39. Bg2 Kg7 40. Kf1 e2+ 41. Ke1 Re5
42. Rc1 Nxg5 43. Rxc5 Rxc5 44. Nxc5 f5 45. Kxe2 Kf6 46. Ke3
Nf7 47. Nd3 1-0
[Event "Morelia-Linares"]
[Date "2008.02.20"]
[White "Veselin Topalov"]
[Black "Magnus Carlsen"]
[ECO "B04"]
1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 dxe5 5.Nxe5 c6 6.Bd3 Nd7
7.Nxd7 Bxd7 8.O-O g6 9.Nd2 Bg7 10.Nf3 O-O 11.Re1 Bg4 12.c3 c5
13.Be4 cxd4 14.cxd4 e6 15.Qb3 Bxf3 16.Bxf3 Bxd4 17.Bxd5 Qxd5
18.Qxd5 exd5 19.Rd1 Bg7 20.Kf1 Rfd8 21.Bg5 Rd7 22.Rd2 h6
23.Be3 d4 24.Rd3 Rc8 25.Bd2 Rc2 26.Rb1 Re7 27.a4 f5 28.b3 Rec7
29.Be1 Kf7 30.Rd2 Rc1 31.Rxc1 Rxc1 32.Ke2 Rb1 33.Rd3 Ke6 34.h4
Kd5 35.Bd2 Ke4 36.Rg3 f4 37.Rd3 Be5 38.f3+ Kd5 39.Be1 Bd6
40.Bd2 g5 41.hxg5 hxg5 42.Be1 g4 43.fxg4 Ke4 44.g5 0-1
[Event "Russian Championship Superfinal"]
[Date "2009.12.24"]
[White "Alexander Grischuk"]
[Black "Alexander Riazantsev"]
[ECO "B04"]
[WhiteElo "2736"]
[BlackElo "2661"]
1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 dxe5 5. Nxe5 g6 6. Bc4 Be6
7. O-O Bg7 8. Re1 O-O 9. Nd2 Nd7 10. Nef3 N7f6 11. Rxe6 fxe6
12. Ng5 Qd6 13. Qe1 b5 14. Bb3 a5 15. a4 bxa4 16. Nc4 Qc6
17. Rxa4 Ra6 18. Rxa5 Rfa8 19. Bd2 Bh6 20. h4 Bxg5 21. hxg5
Nd7 22. Rxa6 Qxa6 23. Na5 c5 24. Ba4 Ra7 25. Bxd7 Rxd7
26. dxc5 Nc7 27. c4 Qa8 28. c6 Rd3 29. Bc3 Qf8 30. Qe5 Rd1+
31. Kh2 1-0
However, 4.f4 is not a blunder nor a bad move, it is a favorite of GM Victor Kupreichik.
[Event "Moscow PCA-op"]
[Date "1994.??.??"]
[White "Viktor Kupreichik"]
[Black "Simen Agdestein"]
[ECO "B03"]
1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.f4 g6 5.Bc4 Be6 6.Bb3 a5 7.c4 Nb6
8.c5 dxc5 9.Bxe6 fxe6 10.dxc5 Qxd1+ 11.Kxd1 Na4 12.Be3 Na6
13.c6 Nxb2+ 14.Ke2 b5 15.Nd2 Nb4 16.Ngf3 Nd5 17.Nd4 Nc3+
18.Kf3 Bh6 19.Ne4 Nd5 20.Nxe6 Nc4 21.Bc1 Ra6 22.Rd1 Rxc6
23.Rxd5 Rxe6 24.Rxb5 O-O 25.Kg3 g5 26.Nxg5 Bxg5 27.fxg5 Rxe5
28.Rxe5 Nxe5 29.Bf4 Nc4 30.Rc1 Nd6 31.Rxc7 Ne4+ 32.Kg4 Nf2+
33.Kf3 Nd3 34.g3 e5 35.Ke3 Nxf4 36.gxf4 Rxf4 37.Rc5 Ra4
38.Rxe5 Rxa2 39.h4 a4 40.Ra5 a3 41.Kf3 Ra1 42.Kg4 Rb1 43.Rxa3
Rb6 44.Ra7 h6 45.Kh5 hxg5 46.hxg5 Rb1 1/2-1/2
[Event "Nice"]
[Date "1994.??.??"]
[White "Viktor Kupreichik"]
[Black "Ljubivoje Perunovic"]
[ECO "B03"]
1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.f4 g6 5.Bc4 Nb6 6.Bb3 Bg7 7.a4 a5
8.Nf3 O-O 9.O-O Bg4 10.h3 Bxf3 11.Qxf3 d5 12.f5 gxf5 13.Qxf5
Qd7 14.Qh5 Qe6 15.Nc3 c6 16.Bg5 N8d7 17.Rae1 Rae8 18.Qh4 Nc8
19.Bd2 Qg6 20.Ne2 b6 21.Rf3 Kh8 22.Rg3 Qe6 23.Rxg7 Kxg7 24.Nf4
Qf5 25.g4 1-0
[Event "Dortmund op"]
[Date "1991.??.??"]
[White "Viktor Kupreichik"]
[Black "Tibor Karolyi Jr."]
[ECO "B03"]
1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.f4 dxe5 5.fxe5 c5 6.Nf3 Bf5 7.Bb5+
Nc6 8.c4 Nc7 9.Bxc6+ bxc6 10.Nc3 e6 11.Qa4 Qd7 12.Be3 cxd4
13.Nxd4 c5 14.Ndb5 Nxb5 15.Nxb5 O-O-O 16.O-O Be7 17.b4 cxb4
18.c5 Bc2 19.Qa6+ 1-0
[Event "Prag"]
[Date "1990.??.??"]
[White "Viktor Kupreichik"]
[Black "Kestutis Kaunas"]
[ECO "B03"]
1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.f4 Bf5 5.Nf3 e6 6.Bd3 Bxd3 7.Qxd3
c5 8.O-O Nc6 9.c3 dxe5 10.fxe5 Be7 11.dxc5 Bxc5+ 12.Kh1 Nce7
13.Qe2 Nf5 14.Nbd2 h5 15.Ne4 Qb6 16.Bf4 O-O-O 17.a4 Be3 18.Bg5
Bxg5 19.Nexg5 Rd7 20.a5 Qe3 21.Qc4+ Kb8 22.a6 Qb6 23.axb7 Kxb7 24.Qe4 Rhd8 25.b4 Qe3 26.b5 Qxe4 27.Nxe4 Kc7 28.Nc5 Kb6
29.Nxd7+ Rxd7 30.c4 Nde7 31.Rfc1 Kc5 32.Ng5 Ng6 33.Ne4+ Kb4 34.Rab1+ Ka3 35.c5 Nxe5 36.b6 axb6 37.cxb6 Ne7 38.Rc7 Rd8 39.Ra7+ 1-0
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