/usr/share/liblouis/tables/en-chess.ctb is in liblouis-data 2.5.3-2ubuntu1.5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# BRLTTY - A background process providing access to the console screen (when in
# text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2008 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed under the terms of the
# GNU Lesser General Public License, as published by the Free Software
# Foundation; either version 2.1 of the License, or (at your option) any
# later version. Please see the file LICENSE-LGPL for details.
#
# Web Page: http://mielke.cc/brltty/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################
# This text subtable defines braille representations for the chess figures in
# terms of the letters that are used for them in the English language.
# See: http://en.wikipedia.org/wiki/Chess_symbols_in_Unicode
# generated by ttbtest
punctuation \x2654 137 WHITE CHESS KING
punctuation \x2655 123457 WHITE CHESS QUEEN
punctuation \x2656 12357 WHITE CHESS ROOK
punctuation \x2657 127 WHITE CHESS BISHOP
punctuation \x2658 13457 WHITE CHESS KNIGHT
punctuation \x2659 12347 WHITE CHESS PAWN
punctuation \x265a 13 BLACK CHESS KING
punctuation \x265b 12345 BLACK CHESS QUEEN
punctuation \x265c 1235 BLACK CHESS ROOK
punctuation \x265d 12 BLACK CHESS BISHOP
punctuation \x265e 1345 BLACK CHESS KNIGHT
punctuation \x265f 1234 BLACK CHESS PAWN
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