Title matches

Records

Every number is the ChessFlex coach's: a side's chances as it sees them, and what a move did to its own side's chances. Each blunder and missed win was checked again by a second, stronger engine before it went on this page.

The ten biggest blunders

Wins that got away

A player the coach gave 85% or more, who didn't win. The move shown is the one that let it go.

The wildest games

How far the chances swung, all game long.

1. Karpov v Korchnoi 1978, Game 5 Korchnoi v Karpov · ½–½ · 123 moves · swing 6.5
2. Carlsen v Nepomniachtchi 2021, Game 6 Carlsen v Nepomniachtchi · 1–0 · 135 moves · swing 6.5
3. Steinitz v Chigorin 1892, Game 15 Chigorin v Steinitz · 1–0 · 46 moves · swing 6.5
4. Botvinnik v Tal 1961, Game 20 Tal v Botvinnik · ½–½ · 121 moves · swing 6.4
5. Lasker v Steinitz 1894, Game 6 Steinitz v Lasker · ½–½ · 71 moves · swing 6.3
6. Ding v Nepomniachtchi 2023, Game 14 Ding v Nepomniachtchi · ½–½ · 90 moves · swing 6.3
7. Kramnik v Topalov 2006, Game 2 Topalov v Kramnik · 0–1 · 63 moves · swing 5.8
8. Carlsen v Karjakin 2016, Game 4 Karjakin v Carlsen · ½–½ · 93 moves · swing 5.7
9. Alekhine v Bogoljubov 1929, Game 23 Alekhine v Bogoljubov · ½–½ · 82 moves · swing 5.6
10. Steinitz v Chigorin 1889, Game 13 Chigorin v Steinitz · 1–0 · 63 moves · swing 5.4

The cleanest games

Both players' accuracy, the lower of the two first; 30 moves or more.

1. Carlsen v Anand 2013, Game 8 Carlsen v Anand · ½–½ · 97.3 / 97.1
2. Smyslov v Botvinnik 1957, Game 3 Botvinnik v Smyslov · ½–½ · 97.0 / 97.3
3. Lasker v Schlechter 1910, Game 3 Schlechter v Lasker · ½–½ · 96.3 / 96.8
4. Gukesh v Ding 2024, Game 4 Ding v Gukesh · ½–½ · 96.0 / 96.7
5. Petrosian v Spassky 1966, Game 1 Spassky v Petrosian · ½–½ · 95.9 / 96.1
6. Kramnik v Topalov 2006, Game 12 Kramnik v Topalov · ½–½ · 96.1 / 95.9
7. Anand v Gelfand 2012, Game 4 Gelfand v Anand · ½–½ · 95.8 / 95.7
8. Kasparov v Karpov 1985, Game 20 Karpov v Kasparov · ½–½ · 95.6 / 95.6
9. Kasparov v Karpov 1986, Game 3 Karpov v Kasparov · ½–½ · 95.7 / 95.6
10. Spassky v Petrosian 1969, Game 6 Petrosian v Spassky · ½–½ · 95.5 / 95.6

The longest games

1. Carlsen v Nepomniachtchi 2021, Game 6 Carlsen v Nepomniachtchi · 1–0 · 136 moves
2. Karpov v Korchnoi 1978, Game 5 Korchnoi v Karpov · ½–½ · 124 moves
3. Carlsen v Anand 2014, Game 7 Carlsen v Anand · ½–½ · 122 moves
4. Botvinnik v Tal 1961, Game 20 Tal v Botvinnik · ½–½ · 121 moves
5. Lasker v Tarrasch 1908, Game 14 Tarrasch v Lasker · ½–½ · 119 moves

The shortest wins

1. Anand v Gelfand 2012, Game 8 Anand v Gelfand · 1–0 · 17 moves
2. Steinitz v Zukertort 1886, Game 20 Steinitz v Zukertort · 1–0 · 19 moves
3. Steinitz v Gunsberg 1890, Game 16 Gunsberg v Steinitz · 1–0 · 21 moves
4. Lasker v Marshall 1907, Game 14 Lasker v Marshall · 1–0 · 21 moves
5. Steinitz v Chigorin 1889, Game 4 Steinitz v Chigorin · 1–0 · 22 moves