Bugfixes:
* Fix ``chess.gaviota.PythonTablebase`` does not properly resolve positions
 where en passant captures are the best move.

Bugfixes:
* ``chess.engine``: Fix parsing of UCI options containing containing ``name``,
 ``type``, ``default``, ``min``, or ``max``, e.g., ``mini``.

Changes:
* Drop support for Python 3.7, which has reached its end of life.
* ``chess.engine.EventLoopPolicy`` is no longer needed and now merely an alias
 for the default event loop policy.
* If available and requested via ``setpgrp``, use ``process_group`` support
 from Python 3.11 for engine processes.
* No longer eagerly reject 8 piece positions in ``chess.syzygy``, so that
 some 8 piece positions with decisive captures can be probed successfully.
* The string wrapper returned by ``chess.svg`` functions now also implements
 ``_repr_html_``.
* Significant changes to ``chess.engine`` internals:
 ``chess.engine.BaseCommand`` methods other than the constructor no longer
 receive ``engine: Protocol``.
* Significant changes to board state internals: Subclasses of ``chess.Board``
 can no longer hook into board state recording/restoration and need to
 override relevant methods instead (``clear_stack``, ``copy``, ``root``,
 ``push``, ``pop``).
New features:
* Add ``chess.pgn.Game.time_control()`` and related data models.
* Add model ``sf16.1`` for ``chess.engine.Score.wdl()``, the new default.
Bugfixes:
* Fix unsolicited engine output may cause assertion errors with regard to
 command states.
* Fix handling of whitespace in UCI engine communication.
* For ``chess.Board.epd()`` and ``chess.Board.set_epd()``, require that EPD
 opcodes start with a letter.

New features:
* Use ``chess.engine.Opponent`` to send opponent information to engines.
* Inform engines about the game result using
 ``chess.engine.Protocol.send_game_result()``.
* Add ``chess.engine.Limit.clock_id``.
* Add ``chess.svg.board(..., borders=True)``.
* Avoid rendering background behind SVG boards to better support transparency.
* Add ``chess.pgn.BaseVisitor.begin_parse_san()``.
* Introduce new distance metrics ``chess.square_manhattan_distance()`` and
 ``chess.square_knight_distance()``.
Bugfixes:
* Fix ``chess.pgn.GameNode.eval()`` sometimes off by one centipawn.
* Fix handling of additional spaces between UCI option tokens.
* Handle implicit XBoard engine resignation via output like
 ``0-1 {White resigns}``.
Changes:
* Add model ``sf16`` for ``chess.engine.Score.wdl()``, the new default.
* Update ``lichess`` WDL model.
* Keep PGN headers that do not belong to the Seven Tag Roster in insertion
 order.
* Halve the number of open file descriptors maintained by tablebases
 and opening books.
* Reduce verbosity of logged ``chess.pgn`` errors.

Bugfixes:
* Fix ``PovScore.wdl()`` ignored ``model`` and ``ply`` parameters.
* ``chess.syzygy``: Check that board matches tablebase variant.
New features:
* Add model ``sf15.1`` for ``chess.engine.Score.wdl()``.
* Raise more specific exceptions: ``chess.IllegalMoveError``,
 ``chess.AmbiguousMoveError``, and ``chess.InvalidMoveError``.

Bugfixes:
* Fix some valid characters were not accepted in PGN tag names.
Changes:
* Skip over syntactically invalid PGN tags.
* Detect Antichess insufficient material with two opposing knights.
New features:
* Add ``chess.Board.unicode(..., orientation=chess.WHITE)``.

Bugfixes:
* Fix recursive Crazyhouse move generation sometimes failing with
 with ``RuntimeError``.
* Fix rendering of black pawn SVG on dark background.
New features:
* Add ``chess.engine.AnalysisResult.would_block()``.

Bugfixes:
* Reject pawn capture SAN if the original file is not specified, e.g.,
 ``d5`` will no longer match ``cxd5``.
Changes:
* Tweak handling of whitespace in PGN comments: When parsing, any leading
 and trailing whitespace (beyond one space) is preserved. When joining
 multiple PGN comments, they are now separated with a space instead of a
 newline character. When removing annotations from comments, leftover
 whitespace is avoided.
New features:
* Add model ``sf15`` for ``chess.engine.Score.wdl()``.

Bugfixes:
* Expand position validation to detect check conflicting with en passant
 square.
New features:
* Add ``chess.svg.board(..., fill=...)``.
* Let ``chess.svg.board()`` add ASCII board as description of SVG.
* Add hint when engine process dies due to illegal instruction.

Bugfixes:
* Fix ``SquareSet.issuperset()`` and ``SquareSet.issubset()`` by swapping
 their respective implementations.
New features:
* Read and write PGN comments like ``[%emt 0:05:21]``.