At the 365Chess Chess Opening Explorer we find an “Engine Eval.” for the top seven moves played against the “A00 Polish (Sokolsky) opening.” 1…f5 is the eighth most often played move, with 57 games in the database.
Gabriel Barandiaran 1834 vs Alvaro Guerrero 2094
Duchamp Cup 2020 round 09
1. b4 f5 2. Bb2 Nf6 3. Nf3 c6 4. e3 d5 5. c4 e6 6. c5 b6 7. d4 a5 8. a3 Be7 9. Ne5 O-O 10. Be2 Qc7 11. Nd2 Na6 12. cxb6 Qxb6 13. Qa4 axb4 14. Qxc6 Rb8 15. a4 Qa7 16. Bb5 Rb6 17. Qc2 Nb8 18. O-O Ba6 19. Bxa6 Rxa6 20. Rfc1 Bd6 21. Ndf3 Ne4 22. Ne1 f4 23. exf4 Bxe5 24. dxe5 Rxf4 25. Nd3 Rf8 26. Qc7 Nd2 27. Qxa7 Rxa7 28. Nc5 Kf7 29. Bd4 Rc7 30. a5 Nc4 31. a6 Nc6 32. Nb3 Ra8 33. f4 Kg6 34. Bc5 Kf5 35. g3 g5 36. fxg5 Kxg5 37. Bd6 Rca7 38. Nc5 N6xe5 39. Nxe6+ Kf6 40. Nc7 Nxd6 41. Nxd5+ Kg5 42. Nxb4 Nf5 43. Ra5 Nf3+ 44. Kf2 Nd4 45. g4 Kxg4 46. Rg1+ Kh4 47. Rga1 Kg5 48. Re1 Kg6 49. Re4 Rb8 50. Nd5 Rb2+ 51. Ke1 Nf3+ 52. Kd1 N5d4 53. Nf4+ Kf7 54. Kc1 Rc2+ 55. Kd1 Rd2+ 0-1
https://www.chessbomb.com/arena/2020-duchamp-cup/09-Barandiaran_Gabriel-Guerrero_Alvaro
1 b4 f5 2 Bb2 (e3 SF) Nf6 3 Nf3 (SF 10 @depth 34 shows 3 e3, but going deeper to depth 40 prefers 3 b5, a TN) 3…c6
(SF 3…e6)
The only other game found with 3…c6
Camilla Baginskaite (2336) vs Michael Aigner (2263)
Franett mem San Francisco 01/03/2005
A04 Reti v Dutch
1.Nf3 f5 2.b4 Nf6 3.Bb2 c6 4.c4 d6 5.d4 g6 6.g3 Bg7 7.Bg2 O-O 8.O-O Na6 9.Qb3 Nc7 10.a4 Ne4 11.b5 c5 12.e3 Ne8 13.Nbd2 N8f6 14.Rad1 Qc7 15.Nxe4 Nxe4 16.Nd2 Be6 17.d5 Nxd2 18.Rxd2 Bd7 19.Bxg7 Kxg7 20.Qc3+ Rf6 21.a5 Rf8 22.Rfd1 Kg8 23.f4 R8f7 24.Re1 Qd8 25.Rde2 Qf8 26.e4 fxe4 27.Rxe4 Qg7 28.Qe3 Kf8 29.h3 h5 30.Kh2 Bc8 31.Re6 Ke8 32.h4 Kd8 33.Bh3 Bd7 34.Re2 Qf8 35.Bg2 Rg7 36.Qc3 Bc8 37.Bh3 Bd7 38.Rxf6 Qxf6 39.Qxf6 exf6 40.Be6 Re7 41.f5 gxf5 42.Kg2 Bxe6 43.dxe6 Rg7 44.Rf2 Ke7 45.Rxf5 Rh7 46.a6 b6 47.Kf3 Kxe6 48.Ke4 Rh8 49.Rd5 Rh7 50.Rf5 Rh8 51.Rd5 Rh7 ½-½
https://www.365chess.com/game.php?back=1&gid=3101776&m=7
Armchair Warrior 