i programmed a new chess engine in C++:
https://gitlab.com/tsoj/squared-chess/tags/1.1.0
It has a lichess elo of around 2000.
The engine will be sometimes online here: https://lichess.org/@/squared-chess. Accepts pretty much any standard challenge except correspondence chess.
Here is a game between ^2-chess and Deepov:
[pgn][Event "Computer Schach Partie"] [Site "https://lichess.org/2sV09qus"] [Date "2018.09.20"] [Round "?"] [White "Deepov"] [Black "^2-chess"] [Result "0-1"] [WhiteElo "?"] [BlackElo "?"] [Variant "Standard"] [Variation "Colle-System: 3...e6"] [TimeControl "40/300:40/300:40/300"] [ECO "D05"] [Opening "Colle System"] [Termination "Normal"] [Annotator "lichess.org"] 1. d4 { [%eval 0.08] } 1... d5 { [%eval 0.07] } 2. e3 { [%eval 0.0] } 2... e6 { [%eval 0.12] } 3. Nf3 { [%eval 0.02] } 3... Nf6 { [%eval 0.12] } { D05 Colle System } 4. Bd2 { [%eval -0.19] } 4... c5 { [%eval -0.01] } 5. Bb5+?! { (-0.01 → -0.73) Inaccuracy. Best move was c4. } { [%eval -0.73] } (5. c4 Nc6 6. Bc3 cxd4 7. Nxd4 Be7 8. Be2 dxc4 9. Nd2 Bd7) 5... Bd7 { [%eval -0.27] } 6. a4 { [%eval -0.73] } 6... Qb6?! { (-0.73 → -0.16) Inaccuracy. Best move was a6. } { [%eval -0.16] } (6... a6 7. Be2 cxd4 8. exd4 Bd6 9. c4 Nc6 10. c5 Bc7 11. O-O O-O 12. Re1 Ne4 13. Nc3) 7. Bxd7+?! { (-0.16 → -0.79) Inaccuracy. Best move was c4. } { [%eval -0.79] } (7. c4 cxd4 8. exd4 dxc4 9. Nc3 Bxb5 10. axb5 Bd6 11. Qa4 O-O 12. Qxc4 Nbd7 13. O-O Rfc8) 7... Nbxd7 { [%eval -0.54] } 8. O-O?! { (-0.54 → -1.22) Inaccuracy. Best move was a5. } { [%eval -1.22] } (8. a5 Qc7 9. O-O Bd6 10. a6 Rb8 11. Qe2 bxa6 12. Nc3 Ne4 13. Rxa6 Nxd2 14. Qxd2 Rxb2) 8... Qxb2 { [%eval -0.91] } 9. Nc3 { [%eval -1.39] } 9... Qb6 { [%eval -1.09] } 10. Rb1 { [%eval -1.39] } 10... Qc6 { [%eval -1.38] } 11. Ne5 { [%eval -1.52] } 11... Nxe5 { [%eval -1.32] } 12. dxe5 { [%eval -1.48] } 12... Nd7 { [%eval -1.39] } 13. f4 { [%eval -1.49] } 13... Be7 { [%eval -1.47] } 14. Qe2 { [%eval -1.55] } 14... c4?! { (-1.55 → -0.95) Inaccuracy. Best move was a6. } { [%eval -0.95] } (14... a6 15. a5 O-O 16. Nd1 c4 17. Bc3 Rab8 18. Bd4 Bc5 19. Qd2 b5 20. axb6 Bxb6 21. Bxb6) 15. Nb5 { [%eval -1.35] } 15... Nc5?! { (-1.35 → -0.55) Inaccuracy. Best move was O-O. } { [%eval -0.55] } (15... O-O) 16. Bb4?! { (-0.55 → -1.40) Inaccuracy. Best move was f5. } { [%eval -1.4] } (16. f5 exf5 17. Nd4 Qc7 18. Nxf5 Qxe5 19. Bb4 b6 20. Qg4 g6 21. Nxe7 Qxe7 22. Qd4 O-O) 16... O-O? { (-1.40 → 0.00) Mistake. Best move was g6. } { [%eval 0.0] } (16... g6 17. Bxc5 Bxc5 18. Nd4 Qd7 19. Qf3 b6 20. Ra1 O-O 21. c3 Rfc8 22. Qf2 Rab8 23. Qg3) 17. Bxc5? { (0.00 → -1.74) Mistake. Best move was f5. } { [%eval -1.74] } (17. f5 exf5 18. Nd4 Qc7 19. Nxf5 Rae8 20. Qg4 g6 21. Nh6+ Kg7 22. Nf5+ Kg8) 17... Bxc5 { [%eval -1.42] } 18. Nd4?! { (-1.42 → -2.17) Inaccuracy. Best move was c3. } { [%eval -2.17] } (18. c3 a6) 18... Qxa4 { [%eval -1.98] } 19. Rxb7 { [%eval -2.12] } 19... Bb6? { (-2.12 → -0.99) Mistake. Best move was Qe8. } { [%eval -0.99] } (19... Qe8 20. Qf2) 20. Qd2? { (-0.99 → -2.16) Mistake. Best move was f5. } { [%eval -2.16] } (20. f5 Bxd4) 20... Rad8?! { (-2.16 → -1.59) Inaccuracy. Best move was Qe8. } { [%eval -1.59] } (20... Qe8 21. Qb4 Qc8 22. Qe7 Bc5 23. Qc7 a5 24. Qxc8 Rfxc8 25. f5 exf5 26. Rxf5 Rf8 27. Rb5) 21. Qc3?! { (-1.59 → -2.40) Inaccuracy. Best move was f5. } { [%eval -2.4] } (21. f5 Rd7 22. Rxd7 Qxd7 23. Qe1 Bxd4 24. exd4 exf5 25. Qb4 Qe6 26. Qa5 a6 27. Rb1 f4) 21... Qa6 { [%eval -2.13] } 22. Re7 { [%eval -2.43] } 22... Bc5 { [%eval -2.31] } 23. Ra1 { [%eval -2.34] } 23... Qc8 { [%eval -2.11] } 24. Raxa7?! { (-2.11 → -2.82) Inaccuracy. Best move was Rexa7. } { [%eval -2.82] } (24. Rexa7 Bxa7 25. Rxa7 Rd7 26. Ra5 Rb7 27. Kf2 Rb8 28. g3 h6 29. Kg2 Qb7 30. Qe1 Rfc8) 24... Bxe7 { [%eval -2.8] } 25. Rxe7 { [%eval -2.8] } 25... Qa6 { [%eval -2.66] } 26. Rc7 { [%eval -2.84] } 26... Qb6 { [%eval -2.78] } 27. Rc6 { [%eval -2.75] } 27... Qb1+ { [%eval -2.67] } 28. Kf2 { [%eval -2.77] } 28... Ra8 { [%eval -2.61] } 29. e4? { (-2.61 → -3.65) Mistake. Best move was Qe1. } { [%eval -3.65] } (29. Qe1 Qb7 30. h3 Qb2 31. Rc5 Rfb8 32. Ra5 Rxa5 33. Qxa5 Qc1 34. Qe1 Qxe1+ 35. Kxe1 Ra8) 29... dxe4? { (-3.65 → -2.47) Mistake. Best move was Ra1. } { [%eval -2.47] } (29... Ra1) 30. Rxc4? { (-2.47 → -3.73) Mistake. Best move was Qe1. } { [%eval -3.73] } (30. Qe1 Qxe1+ 31. Kxe1 Rfc8 32. Rxc8+ Rxc8 33. Ke2 Kf8 34. Ke3 Ra8 35. Kxe4 Ra1 36. Ke3 Ke7) 30... Ra1 { [%eval -3.56] } 31. Rc8 { [%eval -3.7] } 31... Qg1+ { [%eval -3.47] } 32. Kg3 { [%eval -3.61] } 32... Ra8 { [%eval -2.77] } 33. Nc6?? { (-2.77 → -16.36) Blunder. Best move was Rxf8+. } { [%eval -16.36] } (33. Rxf8+) 33... Raxc8 { [%eval -16.18] } 34. Ne7+ { [%eval -16.17] } 34... Kh8 { [%eval -13.96] } 35. Nxc8 { [%eval -16.07] } 35... e3 { [%eval -15.69] } 36. Qc5 { [%eval -16.07] } 36... Rg8 { [%eval -14.6] } 37. Nd6 { [%eval -15.7] } 37... Qf2+ { [%eval -13.38] } 38. Kh3 { [%eval -12.82] } 38... Qxf4 { [%eval -11.82] } 39. Qd4 { [%eval -16.67] } 39... g5 { [%eval -16.59] } 40. Qxf4 { [%eval -16.59] } 40... gxf4 { [%eval -15.96] } 41. Nxf7+ { [%eval -16.31] } 41... Kg7 { [%eval -16.02] } 42. Ng5 { [%eval -15.64] } 42... e2 { [%eval -15.32] } 43. Nf3 { [%eval -14.68] } 43... h5 { [%eval -12.14] } 44. Kh4?! { (-12.14 → Mate in 20) Checkmate is now unavoidable. Best move was c3. } { [%eval #-20] } (44. c3 Rc8) 44... Kh6 { [%eval #-20] } 45. Kh3 { [%eval #-16] } 45... Ra8 { [%eval #-15] } 46. c3 { [%eval #-16] } 46... Ra1 { [%eval #-19] } 47. g4 { [%eval #-10] } 47... Rf1 { [%eval #-9] } 48. g5+ { [%eval #-9] } 48... Kg6 { [%eval #-8] } 49. Kg2 { [%eval #-8] } 49... Rxf3 { [%eval #-7] } 50. Kxf3 { [%eval #-7] } 50... e1=Q { [%eval #-6] } 51. Kxf4 { [%eval #-6] } 51... Qxc3 { [%eval #-5] } 52. Ke4 { [%eval #-5] } 52... Qc2+?! { (Mate in 5 → Mate in 7) Not the best checkmate sequence. Best move was h4. } { [%eval #-7] } (52... h4 53. Kf4 Qd3 54. Kg4 Qe4+ 55. Kh3 Kh5 56. g6 Qf3#) 53. Ke3 { [%eval #-6] } 53... Qxh2 { [%eval #-7] } 54. Kd4 { [%eval #-7] } 54... Qf4+ { [%eval #-7] } 55. Kc5 { [%eval #-7] } 55... h4 { [%eval #-6] } 56. Kd6 { [%eval #-6] } 56... Qd4+ { [%eval #-5] } 57. Kxe6 { [%eval #-5] } 57... h3 { [%eval #-4] } 58. Ke7 { [%eval #-4] } 58... Qxe5+?! { (Mate in 4 → Mate in 4) Not the best checkmate sequence. Best move was h2. } { [%eval #-4] } (58... h2 59. Ke6 h1=Q 60. Ke7 Qb7+ 61. Ke8 Qf7#) 59. Kd7 { [%eval #-4] } 59... h2 { [%eval #-3] } 60. Kc8 { [%eval #-3] } 60... h1=Q { [%eval #-2] } 61. Kd7 { [%eval #-2] } 61... Qh7+ { [%eval #-1] } 62. Kc6 { [%eval #-1] } 62... Qhc7# { Black wins by checkmate. } 0-1 [/pgn]
