The importance of historical data in the Candidates

The Candidates Tournaments remain one of the most critical stops on the chess calendar, as they determine the challengers for the next World Championship matches in both the open and women’s sections. In a double round-robin format featuring such a small and elite field, every half-point carries enormous weight. For that reason, it is useful to look not only at the players’ current Elo ratings or recent tournament form, but also at the direct scores they have built against one another over the years.

The data compiled by ChessBase gives this perspective a solid statistical foundation. The Mega Database 2026 used for the study offers an exceptionally strong resource for this kind of work, with more than 11.7 million games from 1475 to 2026 and well over one hundred thousand annotated encounters. It is especially noteworthy that the figures are divided into two categories: first, games played only at classical time controls; second, all encounters, including rapid, blitz, Chess960, online and over-the-board games. This makes it possible to see both the history of a pairing under “true tournament conditions” and the broader memory of the rivalry.

Such head-to-head statistics are not decisive on their own, but they often reveal trends that do not appear in rating lists. Some players feel comfortable against certain opponents because of opening choices, while others play with greater confidence in matchups where they have established a psychological edge. At the same time, when all games are examined together, it becomes clear that dominance in rapid or blitz does not always transfer directly to classical chess. In an event like the Candidates, where preparation is deep and risk management is delicate, that distinction matters greatly.

Even so, it must be stressed that past scores do not guarantee future results. A player’s form, opening preparation, rest level and psychological balance during the tournament can all be more decisive than historical numbers. Still, on the Candidates stage, where the margins are incredibly narrow, head-to-head history adds valuable context to every pairing. Especially in an early phase such as round two, these figures serve as a useful reference for understanding which duels have traditionally been balanced and which ones feature a quiet but clearly established edge.