There's this probably never widely played shogi variant: https://en.wikipedia.org/wiki/Taikyoku_shogi https://en.wikipedia.org/wiki/Taikyoku_shogi "Each playe

There's this probably never widely played shogi variant: https://en.wikipedia.org/wiki/Taikyoku_shogi https://en.wikipedia.org/wiki/Taikyoku_shogi "Each player has a set of 402 wedge-shaped pieces of 209 types. The players must remember 253 sets of moves."