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Chess 11 includes the following updates:



Chess 11 uses a new save file format that allows for pawn underpromotion. It is compatible with save files from version 9 or 10 which do not contain pawn promotions, as promotion moves in those save files lack the promotion indicator character that lets Chess 11 differentiate between saved moves and manual moves. You can update an incompatible save file from version 9 or 10 by editing the file and adding a "1" to the end of each promotion move.