Chess 11 includes the following updates:
- Visible move list: a new pane to the right of the board displays the current game's stored list of moves in ICCF format
- Promotion: you can now promote a pawn to a queen, rook, bishop, or knight
- Import ICCF: you can now import a list of moves in ICCF notation to be automatically converted into Chess's native format and loaded into the game
- Export ICCF: you can now export the current game's stored list of moves to ICCF notation
- Export notations: you can now export the current game's stored list of moves to a tab-delimited list of moves in several notations
- Bug fix: you can no longer move for the computer after stepping back to its turn
- Bug fix: Castling moves are now properly highlighted when being replayed in either direction
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.