Seems to me that your engine was way weaker than last month. Something not working or just bad luck (bad opponent+bad opening randomness ?)
Here the game against Cfish 060121 64 Neon (rpi4) : this one may be was egtbs that made the win ?
[pgn][Event "ICS rated blitz match"]
[Site "nightmare-chess.nl"]
[Date "2021.01.16"]
[Round "-"]
[White "rpiforchess"]
[Black "CoronaVirusChess"]
[Result "1-0"]
[WhiteElo "2950"]
[BlackElo "2771"]
[TimeControl "300+1"]
[Annotator "21. +1,25"]
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nb3 Be6 8.
f3 Be7 9. Qd2 O-O 10. O-O-O Nbd7 11. g4 b5 12. g5 b4 13. Ne2 Ne8 14. f4 a5
15. f5 Bc4 16. Ng3 Bxf1 17. Rhxf1 a4 18. Na1 a3 19. b3 Kh8 20. h4 Rc8 21.
Kb1 {+1,25/24 5} Rg8 22. Ne2 {+1,07/28 23} Qa5 23. Qd5 {+1,15/26 1,1} Qa6
24. Ng3 {+1,08/29 21} Rc3 25. Rfe1 {+0,70/30 23} Rf8 26. f6 {+0,77/31 14}
Bxf6 27. gxf6 {+1,57/26 7} Ndxf6 28. Qd2 {+1,47/25 2,0} Qc8 29. Qg2
{+1,62/27 10} Qg4 30. Qg1 {+1,71/28 7} Nxe4 31. Nxe4 {+1,43/29 9} Qxe4 32.
Bd2 {+1,49/29 2,5} Qc6 33. Re3 {+1,25/34 18} Rxe3 34. Qxe3 {+1,35/29 0,7}
f5 35. Bxb4 {+1,48/30 0,9} f4 36. Qd2 {+1,10/30 11} f3 37. Rf1
{+0,94/31 10} Rf7 38. Qe3 {+1,07/33 50} e4 39. Bxa3 {+1,25/27 5} d5 40. Qc5
{+0,57/30 27} Qe6 41. Bc1 {+0,47/28 7} h6 42. Be3 {+1,39/28 6} Nf6 43. c3
{+1,59/28} Ng4 44. Nc2 {+0,53/30 12} Qa6 45. c4 {+0,39/29 17} dxc4 46. Qxc4
{+0,40/26 2,4} Qxc4 47. bxc4 {+0,43/28} Rc7 48. c5 {+0,51/27 5} Nxe3 49.
Nxe3 {+0,73/26} Rxc5 50. Kb2 {+0,05/26 8} Kh7 51. a4 {+0,35/27 2,2} Kg6 52.
Rc1 {+1,37/24 2,5} Re5 53. Kc3 {+0,44/29 8} Kh5 54. Ra1 {+0,74/29 6} Kxh4
55. a5 {+2,36/25 2,1} g5 56. a6 {+2,37/27 2,4} Re8 57. a7 {+2,91/29 0,8}
Ra8 58. Kd4 {+3,17/24 0,5} f2 59. Kxe4 {+7,13/24 2,8} g4 60. Kd3
{+9,94/21 5} g3 61. Ke2 {+11,48/20 2,2} Kg5 62. Kf3 {+12,01/20} Kf6 63. Kg2
{+50,89/21 3} h5 64. Nd5+ {+152,56/29 7} Kg6 65. Nb6 {+152,58/33 1,0} Rxa7
66. Rxa7 {+152,60/36 0,8} f1=Q+ 67. Kxf1 {+152,65/44 3} g2+ 68. Kxg2
{+152,65/42 0,8} Kg5 69. Rf7 {+1000,13/42 0,9} Kg4 70. Rf1
{+1000,11/45 1,0} Kh4 71. Kf3 {+1000,10/47} Kg5 72. Kg3 {+1000,09/46 0,7}
Kh6 73. Kh4 {+1000,07/50 1,0} Kg6 74. Rf3 {+1000,06/65 0,7} Kh7 75. Kxh5
{+1000,05/134 0,8} Kg7 76. Nd7 {+1000,04/245 0,1} Kh7 77. Rf7+
{+1000,03/245} Kg8 78. Kg6 {+1000,02/245} Kh8 79. Rf8# {+1000,01/245}
{CoronaVirusChess checkmated} 1-0[/pgn]