What is The Magnus Effect?

Have a great day :) Magnus Carlsen vs Sipke Ernst “The Magnus Effect“ (game of the day Nov-13-2016) Corus Group C (2004), Wijk aan Zee NED, rd 12, Jan-24 Caro-Kann Defense: Classical Variation. Main lines (B18) 1. e4 c6 2. d4 d5 3. Nc3 de4 4. Ne4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. h5 Bh7 9. Bd3 Bd3 10. Qd3 e6 11. Bf4 Ngf6 12. O-O-O Be7 13. Ne4 Qa5 14. Kb1 O-O 15. Nf6 Nf6 16. Ne5 Rad8 17. Qe2 c5 18. Ng6 fg6 19. Qe6 Kh8 20. hg6 Ng8 21. Bh6 gh6 22. Rh6 Nh6 23. Qe7 Nf7 24. gf7 Kg7 25. Rd3 Rd6 26. Rg3 Rg6 27. Qe5 Kf7 28. Qf5 Rf6 29. Qd7