
The above position was reached in the seventh round game played between GMs Hans Niemann and Jingyao Tin at the III Elllobregat Open being held at Sant Boi de Llobregat, Spain. The game is a dead draw that most, if not all, Grandmasters would probably have split the point long before arriving at this position. Two class B players would, most probably, have agreed to a draw in the position. A case could be made that lesser players should play out these positions because anything can happen. It is simply unfathomable that any GRANDMASTER would play the move next played by Hans Niemann:

If you showed the first position to every human holding a Grandmaster title none of them would play the losing move played by Niemann. Let me be clear, no GM, zero, nada, zip, would play such a losing move even if completely inebriated, or high as a kite on whatever. Why would Niemann play such a losing move? There is always a reason and I cannot wait to learn what could have possibly motivated the young man to give away a half point and lose a completely drawn game. As can be heard here in the South, something “ain’t right.”
Hans Moke Niemann (2699) vs Jingyao Tin (2562)
III Elllobregat Open Chess
Rd 7
ECO D12: Slav Defense: Quiet Variation, Schallopp Defense
- c4 c6 2. d4 d5 3. Nf3 Nf6 4. e3 Bf5 5. Nc3 e6 6. Nh4 Be4 7. f3 Bg6 8. Qb3 Qc7 9. Bd2 Be7 10. cxd5 Nxd5 11. Nxg6 hxg6 12. O-O-O Nxc3 13. Bxc3 a5 14. a3 b5 15. Bd2 a4 16. Qc3 Qb6 17. Kb1 O-O 18. h4 Na6 19. Qc2 b4 20. Bxa6 Rxa6 21. axb4 Bxb4 22. h5 Bxd2 23. Rxd2 a3 24. b3 a2+ 25. Ka1 Ra3 26. Rd3 gxh5 27. Rxh5 Rb8 28. Rc5 Rxb3 29. Rxb3 Qxb3 30. Qxb3 Rxb3 31. e4 Rd3 32. Rxc6 Rxd4 33. Rc2 g5 34. Kxa2 Kg7 35. Kb3 Kf6 36. Kc3 Ke5 37. Ra2 Rd1 38. Ra7 f5 39. Ra5+ Kf4 40. exf5 exf5 41. Ra4+ Ke3 42. Ra5 g4 43. Rxf5 g3 44. f4 Kf2 45. Rg5 Kxg2 46. f5 Rd5 47. Kc4 Ra5 48. Kd3 Kf3 49. Kd4 g2 50. Kc4 Ra4+ 0-1
https://lichess.org/broadcast/3rd-el-llobregat-open/round-7/UTADhDza
13…a5 is a Theoretical Novelty