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Eric Silverman wrote on 2021-02-16 UTC

Fwiw, I once was at the Ottawa home of a player of games such as Go and >Shogi, and watched a documentary from Japan, where for an exhibition a huge >board was made for a unique one-time Shogi variant between two players, with >a few thousand pieces per side used. The game lasted something like 4 days, >and the players naturally took breaks, including a whirlpool break together >(more than the viewer needed to see or know, IMHO).

That match was part of a documentary segment for a variety show. The game in question wasn't a unique one-time Shogi variant, it was Taikyoku Shogi, played on a 36x36 board with 402 pieces per player. The winner in that match achieved checkmate after 3,805 moves and more than 32 hours of play.

Side note: the players took a break to soak in an onsen, a heated bath. People in Japan often go to onsen and bathe communally with strangers, it's very commonplace and no intimacy is implied, so it's nothing to be alarmed about.

There's a clip of the segment here:

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