In this position GN Ding Liren mase an inferior move

[Chessqueen]

I Believe that GM Ding Liren could won against GM Kramnik if he instead move his Rook to b7 instead of His Queen to a6.
[D]2r5/2r2pk1/1qN3p1/2Rp1n2/pQ1P3p/8/P5PP/2R3K1 b - - 0 1

[zullil]

I Believe that GM Ding Liren could won against GM Kramnik if he instead move his Rook to b7 instead of His Queen to a6.
[D]2r5/2r2pk1/1qN3p1/2Rp1n2/pQ1P3p/8/P5PP/2R3K1 b - - 0 1

The position in your post is not correct. It should be

[d]2r5/2r2pk1/1qN3p1/2Rp1n2/pQ1P3p/7P/P5P1/2R3K1 b - - 1 43

43...Qb7 is probably best, according to a very quick search by Cfish-dev.

Here's the game:

[pgn][Event "Tata Steel Masters"] [Site "0:20:33-0:30:33"] [Date "2019.01.22"] [EventDate "2019.1.12"] [Round "9"] [Result "1/2-1/2"] [White "Vladimir Kramnik"] [Black "Ding Liren"] [ECO "D02"] [WhiteElo "?"] [BlackElo "?"] [PlyCount "88"] 1.Nf3 d5 2.d4 Nf6 3.c3 c5 4.e3 e6 5.Nbd2 Nbd7 6.Bd3 b6 7.Qe2 Bb7 8.O-O Be7 9.b3 O-O 10.Bb2 Rc8 11.Rac1 Bd6 12.c4 cxd4 13.exd4 Qe7 14.Ne5 Ba3 15.Bxa3 Qxa3 16.f4 g6 17.Ndf3 dxc4 18.bxc4 Qd6 19.Qe3 Bxf3 20.Nxf3 Rfd8 21.Rcd1 Nb8 22.Kh1 Nc6 23.Be2 Kg7 24.Qc1 h5 25.Qa1 Ne7 26.Ne5 Nf5 27.Rd3 Kg8 28.Bf3 Nd7 29.c5 Qc7 30.Nc6 Re8 31.Ra3 a5 32.cxb6 Qxb6 33.Rc1 Nf6 34.Rac3 Nd5 35.Rc5 Nxf4 36.Qc3 a4 37.Qd2 Nd5 38.h3 Kg7 39.Qf2 h4 40.Kg1 Rc7 41.Qe1 Rec8 42.Bxd5 exd5 43.Qb4 Qa6 44.Ne7 Rxc5 1/2-1/2[/pgn]

[zullil]

[d]2r5/2r2pk1/1qN3p1/2Rp1n2/pQ1P3p/7P/P5P1/2R3K1 b - - 1 43

43...Qb7 is probably best, according to a very quick search by Cfish-dev.

Actually, 43...Rb8 might be best:

-3.11 43... Rb8 44. Qe1 Rxc6 45. Rxc6 Qxd4+ 46. Kh1 Ng3+ 47. Kh2 Qf4 48. Qc3+ d4 49. Qf3 Qxf3 50. gxf3 Re8 51. Rg1 Re3 52. Rxg3 hxg3+ 53. Kxg3 Re2 54. Ra6 Rxa2 55. Rd6 a3 56. Rxd4 Ra1 57. Kf4 Kf6 58. h4 Ke6 59. Ra4 a2 60. Ra6+ Kd5 61. Ra3 Kc4 62. Ra7 Kc3 63. Ra6 Kb3 64. Rb6+ Kc4 65. Ra6 Kc5 66. Ra7 f6 67. Ra6 Kd4 68. Ra8 Kc4 69. Ra6 Kd3 70. Ra3+ Kc2 71. Ra6 Kb2 72. Rb6+ Kc3 73. Ra6 Kc2 74. Ra8 Kb2 (depth 48, 0:37:05)