Clash of Claims

Clash of Claims was a blitz chess match held from 7 to 9 June 2024 in Madrid. It was a match between former World Champion Vladimir Kramnik and Grandmaster José Martínez Alcántara, and sought to address controversies over cheating and fair play in online chess.

Background

Kramnik had previously stated his beliefs in late 2023 that cheating in online chess was much more prevalent than what most people expected. In March 2024, he resigned against Martínez after only one move in a Titled Tuesday event, causing speculation that he believed Martínez to be cheating.
The match was organized by David Martínez, who invited Kramnik and José Martínez to play a match due to their then-identical FIDE blitz ratings of 2703 in February 2024. Commentary was provided by David Martínez and Pepe Cuenca in Spanish, and Levy Rozman in English.

Format

The match was initially composed of 36 blitz games, with half of them being played over-the-board and half being played on laptops at the venue. Kramnik requested that new laptops were unboxed live every day for the online games, and that fair play officers were onsite during the games.

Reception

Levon Aronian stated that the match was exciting and showcased the difference between online and over-the-board chess. Hikaru Nakamura praised Martínez's performance, but expressed disappointment with Kramnik's conduct and behavior.
A rematch titled Clash of Blames would later be played in London in August 2024, with Kramnik winning the match.