Revealed binary Berserk choices made by 5,852 players in the Lichess Yearly Rapid Arena held on April 16, 2026. The chess tournament used a 10-minute clock and lasted eight hours. Going Berserk at the beginning of a game reduced a player's clock to five minutes. In return, a win earned one extra tournament point. A player is considered to have been on a streak when they entered the game after at least two consecutive wins. While on a streak, a win was worth four instead of two points and a draw two instead of one. A Berserk win on a streak was therefore worth five points. A draw or loss ends the streak.
This data can be used to model the risky choice to go Berserk based on playing color, player rating, rating difference to the opponent, remaining tournament time, and risk to lose their winning streak.
Format
A tibble with 37,416 rows and 8 columns:
- deciderID [
character] The player's Lichess username.
- occasionID [
integer] The player's games in chronological order, numbered from 1.
- berserk [
logical] Whether the player chose to go Berserk.
- white [
logical] Whether the player had the white pieces.
- rating [
integer] The player's Rapid rating at the beginning of the game.
- ratingDifference [
integer] The player's rating minus the opponent's rating.
- minutesRemaining [
numeric] The scheduled tournament time remaining, in minutes, when the game was created.
- streak [
logical] Whether the player was on a double-point win streak at the beginning of the game.
Source
Derived from the public game export, results, and tournament metadata for the Lichess Yearly Rapid Arena using the Lichess Arena API. The streak and Berserk rules are described in the Arena tournament FAQ. Lichess database exports are released under the CC0 license.