Magnus Carlsen had a fortunate win over Hou Yifan at the Tata Steel event, when his opponent swapped into a king and pawn ending, and immediately moved the wrong pawn. Instead of 45 ... a5, which held the draw, she player 45 ... h5 and Magnus pounced with 46.Kb4. With the king invading via a5 and b6, Yifan had to retreat her king, but this allowed Carlsen to swap the queenside pawns, and Yifan resigned as her other pawns were about to fall.
Carlsen,Magnus (2844) - Hou,Yifan (2673) [C42]
78th Tata Steel GpA Wijk aan Zee NED (11.1), 29.01.2016
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Nc3 Nxc3 6. dxc3 Be7 7. Be3 Nc6 8. Qd2 Be6 9. O-O-O Qd7 10. b3 Bf6 11. h3 O-O-O 12. g4 h6 13. Bg2 Kb8 14. Rhe1 Rhe8 15. Kb2 a6 16. Re2 Qe7 17. Rde1 Qf8 18. Nd4 Nxd4 19. Bxd4 Bxd4 20. Qxd4 Bd7 21. f4 Rxe2 22. Rxe2 Re8 23. Rxe8+ Bxe8 24. Qb4 c6 25. Bf1 Kc8 26. g5 Qe7 27. gxh6 gxh6 28. Qd4 f6 29. Qa7 Bd7 30. a4 Qd8 31. Qg1 Qe7 32. Qg6 Qe1 33. Bd3 Qh4 34. Bf5 Bxf5 35. Qxf5+ Kb8 36. c4 Kc7 37. Qa5+ Kc8 38. Qd2 Kd7 39. c5 d5 40. Qe3 Qh5 41. Qg3 Qf7 42. Qg4+ f5 43. Qg3 Qf6+ 44. Qc3 Qxc3+ 45. Kxc3 h5 46. Kb4 Kc8 47. Ka5 Kc7 48. h4 Kb8 49. Kb6 Kc8 50. b4 Kb8 51. b5 cxb5 52. axb5 axb5 53. Kxb5 Kc7 54. c3 1-0