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Unclassified · D37

The Knight That Went to the CornerRiazantsev vs Carlsen, 2016

Riazantsev vs Carlsen turns on one decisive knight retreat. See how Carlsen converts the endgame through king activity, pawn creation, and precise piece coordination.

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The game

White
Alexander Riazantsev (2671)
Black
Magnus Carlsen (2840)
Result
0-1
Event
World Rapid Championship
Round
—
Date
28 Dec 2016
ECO
D37
Opening
Unclassified
Length
23:24
Level
advanced

About this game

Riazantsev vs Carlsen was decided by one critical mistake in a Queen’s Gambit Declined endgame. After 51.Nh1, White’s knight lost crucial time and Carlsen’s active king took over. The game ended after 62...Bh5, when Riazantsev resigned in a decisively lost position. Played at the World Rapid Championship, 2016.

Lessons

What you'll learn

Minor-piece endgame

How the endgame is converted: the king comes into play, the passed pawn is created, and the pieces are traded on the right terms.

Central pawn break

When and why the centre is challenged with a pawn — the moment the structure changes, and the plans that change with it.

King activity

In the endgame the king is a piece: how it walks in, which squares it takes, and what that wins.

Outside passed pawn

How Black's passed g-pawn is created, supported and pushed.

Chapters

How the video is organised

  1. 0:00Opening
  2. 2:43Middlegame
  3. 8:41Endgame
  4. 22:04Takeaways

Key positions

The moments that decided it

Move 14 — c5

The c5 Break

Carlsen challenges the centre with 14...c5, the engine's own top choice at an even plus zero point two one. The point is structural: d4 is the pawn White's whole setup rests on, and a pawn standing on c5 puts that pawn under direct pressure. The engine's line continues with White taking on c5 and Black's knight recapturing there, which would leave White to decide how to deal with that newly placed knight. Nothing is won by force on this move itself, but White now has to choose how to meet the tension on d4, while Black gets a freer game to develop into.

Move 27 — Rxc3

27...Rxc3 — Only Move

Twenty-seven, Rook takes c3 — the only move on the board, and the engine confirms it: no alternative kept Black level. It's a recapture, the queen coming off, and material settles back to even. But the character of the game changes completely. The queens are gone, the rooks and minor pieces remain, and the position now asks a different question. Activity matters more than material count. Both kings need to get into the game, and whoever marshals the pawn breaks and the open c-file best will shape what comes next.

Move 36 — Rxd2

36...Rxd2: Rooks Come Off

Carlsen takes on d2, matching the engine’s choice. White recaptures with the king, removing the final pair of rooks while Black keeps the extra pawn. The evaluation barely moves, staying around minus one and a half for Black, but the structure keeps its character: White's pawn on e3 is still isolated, the c and d files stay open, and now it's the kings, not the rooks, who will fight over them. This is the moment the position starts asking both sides to bring their king forward.

Move 38 — g6

A Small Slip

Here Black drifts. With 38...g6, Carlsen nudges a kingside pawn instead of marching the king forward. The engine's preference was Ke6, pushing straight toward the center where it can support both flanks and start pressing White's structure directly. The evaluation slips from minus 1.61 to minus 0.81 — Black's edge shrinks, though nothing is lost yet. It's a small missed step rather than a real error, and the position stays very much alive for both sides.

Move 43 — hxg5

h-file opens

Black recaptures with hxg5, the engine’s own choice, and the evaluation barely changes, from minus 0.50 to minus 0.48. The main effect is structural: the h-file is now completely open, and White is left with isolated pawns on e3 and g3. With the rooks already gone, the open file matters less as an attacking lane and more as extra space for the kings to maneuver. From here, king activity and the remaining pawn weaknesses become the central features of the position.

Move 51 — Nh1

51. Nh1: the losing move

Objectively the position is still close to equal, around minus zero point two two, and the engine prefers Kc3, keeping White’s king active and ready to meet Black’s king on the key queenside squares. Instead Riazantsev plays 51.Nh1, sending the knight into the corner at exactly the wrong moment. The piece takes itself out of the fight for the key squares just when king activity matters most. The evaluation collapses to minus five point nine three. With the knight sidelined on h1, White can no longer keep pace with Black’s king, and Carlsen gets the head start that decides the endgame. The foll

Replay

Play through the game

Starting position
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. 53. 54. 55. 56. 57. 58. 59. 60. 61. 62. 0-1

Move 0 of 124. Positions are generated from the PGN by a deterministic chess library.

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