[what is this?]

[what is this?]

World Champions face 1. f4 This collection includes games from the database where where people tried Bird's Opening against the players who have been world champions (not necessarily during their championship reign). I do not include the champions who won via knock-out tournaments. No one has ever braved 1.f4 against either Kramnik or Anand, it seems! 28 games, 1863-1974