Atomic bomb game
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The atomic bomb game is the name given to the second game of a Go match between Hashimoto Utaro and Iwamoto Kaoru in 1945. The match was played within the city limits of Hiroshima on the day the bomb was dropped; the players and spectators survived only because the police had ordered the match moved from the center of town.
The match was continued after the war, ending in a 3-3 draw. A three-game playoff was held in 1946, won by Iwamoto in two straight games to claim the Honinbo title (becoming Honinbo Kunwa). Utaro went on to reclaim the title in 1950.