As long as the Opening is balanced or with less than 0.50 of an advantage the top 4 chess engines will most likely draw their games. That is the reason why TCEC is chosing openings that give one of the side an edge of more than 0.85. For instance lets take this game and at the end of White opening moves Stockfish is already with a huge advantage, therefore, it will win easy, but if you take the same game and limit the opening to only 4 moves the advantage is reduced to less than 0.50 and in the 2nd game both engines will draw their game 98% of the time.

NOTE: Here in the 2nd game same opening but limited to only 4 moves where the advantage is reduced to less than 0.50 both top engine drew their game.

[pgn][Event "TCEC Season 26 - Division P"]

[Site "https://tcec-chess.com"]

[Date "2024.05.03"]

[Round "34.1"]

[White "Stockfish-windows-x86-64-avx2"]

[Black "Berserk-13-avx2"]

[Result "1/2-1/2"]

[BlackElo "3610"]

[ECO "D15"]

[Opening "Slav"]

[Time "23:45:10"]

[Variation "Chameleon, 5.c5"]

[WhiteElo "3645"]

[TimeControl "3600+5"]

[Termination "unterminated"]

[PlyCount "73"]

[WhiteType "program"]

[BlackType "program"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 a6 5. c5 {(c4-c5 b7-b6 c5xb6 Nb8-d7

a2-a3 Qd8xb6 Nc3-a4 Qb6-c7 g2-g3 e7-e6 Bc1-f4 Bf8-d6 e2-e3 e6-e5 d4xe5

Nd7xe5 Bf4xe5 Bd6xe5 Bf1-g2 Ra8-b8 Nf3xe5 Qc7xe5 O-O O-O Ra1-c1 h7-h5 h2-h4

Bc8-g4 Qd1-d4 Qe5xd4 e3xd4 a6-a5 f2-f3 Bg4-d7 Rf1-f2 Nf6-e8 Rc1-c5 Ne8-d6

Rc5xa5 Rf8-e8 Bg2-f1 Re8-e1 Kg1-h2 Bd7-e8 Na4-c5 Nd6-f5) +0.27/40 131} b6

{(b7-b6 c5xb6 Nb8-d7 Qd1-c2 Qd8xb6 Bc1-f4 e7-e6 a2-a3 Bc8-b7 Nc3-a4 Qb6-a7

e2-e3 Bf8-e7 Bf1-e2 a6-a5 O-O O-O Rf1-c1 Rf8-c8 b2-b4 Bb7-a6 Be2xa6 Qa7xa6

Na4-c5 Qa6-b6 Ra1-b1 a5xb4 a3xb4 Qb6-b5 h2-h3 h7-h6 Bf4-g3 Ra8-a3 Kg1-h1

Rc8-a8 Nc5xd7 Nf6xd7 Qc2xc6 Qb5xc6 Rc1xc6 Ra3-a1 Rb1xa1 Ra8xa1+ Kh1-h2

Be7xb4 Rc6-c8+) -0.31/42 187} 6. cxb6 Nbd7 7. e3 Qxb6 8. Na4 Qc7

9. Bd3 e6 10. O-O a5 11. Qe2 Bd6 12. Bd2 Ne4 13. Rfc1 Nxd2 14. Qxd2

Bb7 15. Rc2 O-O 16. g3 Rfd8 17. Rac1 Qb8 18. Bf1 Qa7 19. Qd3 h6 20. h4 Rac8

21. a3 Rc7 22. Qe2 Ra8 23. Qd1 Rac8 24. Rc3 Ba6 25. Bxa6 Qxa6 26. Kg2 Qb5

27. Qb3 g6 28. Ne1 Qxb3 29. Rxb3 c5 30. dxc5 Nxc5 31. Nxc5 Rxc5 32. Rxc5

Rxc5 33. Kf1 a4 34. Rb4 Rc4 35. Rb6 Bc7 36. Ra6 Kg7 37. Nd3 Bd8 38. Ke1 Bc7

39. Kd2 g5 40. hxg5 hxg5 41. Nb4 Be5 42. Nd3 Bf6 43. f3 Kh6 44. g4 Kg6 45.

Ra7 Kg7 46. Ra6 Kg6 47. Ra7 Bh8 48. Rb7 Bg7 49. Rb8 Bf6 50. Rg8+ Kh6 51.

Rb8 Kh7 52. Rb7 Kg7 53. Ra7 Kg8 54. Ra6 Kf8 55. Ra5 Kg7 56. Ra7 Kg6 57. Ra8

Bg7 58. Ra5 Kh7 59. Ra7 Kg6 60. Ra5 Kh6 61. Ra7 f5 62. gxf5 exf5 63. Ra6+

Kh5 64. Ra5 Kg6 65. Rxd5 Rh4 66. Rd6+ Kh5 67. Rd7 Kh6 68. Ra7 Rh2+ 69. Ke1

Bxb2 70. Nxb2 Rxb2 71. Rxa4 Ra2 72. Kf1 Kg6 73. Ra6+ Kh5 74. Ra5 Kg6 75.

Ra6+ Kh5 76. Ra5 Kh4 77. Rxf5 Rxa3 78. Ke2 Ra2+ 79. Kd3 Kg3 80. e4 g4 81.

fxg4 Ra3+ 82. Kc4 Kxg4 83. Rf1 Kg5 84. Kd5 Ra5+ 85. Ke6 Ra6+ 86. Kd5 Ra5+

87. Kd6 Ra6+ 88. Ke5 Ra5+ 89. Kd6 Ra6+ 90. Kc5 Ra4 91. e5 Ra5+ 92. Kb6 Rxe5

93. Rb1 Re8 94. Kc7 Kf5 95. Rc1 Kf6 96. Rc2 Re6 97. Kd7 Re3 98. Kd6 Kf7 99.

Ra2 Kg8 100. Kd5 Re1 101. Ra8+ Kf7 102. Ra7+ Ke8 103. Kd4 Rd1+ 104. Ke3

Re1+ 105. Kf2 Rb1 106. Ra8+ Kf7 107. Ra6 Rb2+ 108. Kf3 Rb8 109. Ra7+ Ke8

110. Ra2 Kf7 111. Kg2 Rh8 112. Rf2+ Ke6 113. Re2+ Kd5 114. Rd2+ Ke6 115.

Re2+ Kd5 116. Rd2+ Ke4 117. Rd1 Ke5 118. Re1+ Kd6 119. Rd1+ Ke6 120. Ra1

Kf7 121. Ra7+ Ke6 122. Ra1 Kd6 123. Rd1+ Kc7 124. Re1 Rh7 125. Re6 Rg7+

126. Kf2 Rf7+ 127. Kg1 Rf8 128. Re7+ Kb8 129. Re2 Rg8+ 130. Kf1 Rc8 131.

Rb2+ Ka8 132. Ra2+ Kb7 133. Rb2+ Ka8 134. Rb1 Rd8 135. Ra1+ Kb8 136. Rb1+

Ka8 137. Ra1 {User Adjudication} 1/2-1/2[/pgn]