python-chess v0.31.4

Bugfixes:

* Fix inconsistency where `board.is_legal()` was not accepting castling moves
  in Chess960 notation (when board is in standard mode), while all other
  methods did.
* Fix `chess.pgn.GameNode.set_clock()` with negative or floating point values.
* Avoid leading and trailing spaces in PGN comments when setting annotations.

New features:

* Finish typing and declare support for mypy.

python-chess v0.31.3

Bugfixes:

* Custom castling rights assigned to `board.castling_rights` or castling rights
  left over after `Board.set_board_fen()` were not correctly cleaned after
  the first move.

Changes:

* Ignore up to one consecutive empty line between PGN headers.
* Added PGN Variant `From Position` as an alias for standard chess.
* `chess.pgn.FileExporter.result()` now returns the number of written
  characters.
* `chess.engine` now avoids sending 0 for search limits, which some engines
  misunderstand as no limit.
* `chess.engine` better handles null moves sent to the engine.
* `chess.engine` now gracefully handles `NULL` ponder moves and uppercase
  moves received from UCI engines, which is technically invalid.

New features:

* Added `chess.pgn.GameNode.{clock, set_clock}()` to read and write
  `[%clk ...]` **PGN annotations**.
* Added `chess.pgn.GameNode.{arrows, set_arrows}()` to read and write
  `[%csl ...]` and `[%cal ...]` PGN annotations.
* Added `chess.pgn.GameNode.{eval, set_eval}()` to read and write
  `[%eval ...]` PGN annotations.
* Added `SquareSet.ray(a, b)` and `SquareSet.between(a, b)`.

python-chess v0.31.2

Bugfixes:

* Fix rejected/accepted in `chess.engine.XBoardProtocol`.
* Misc typing fixes.

Changes:

* Deprecated `chess.syzygy.is_table_name()`. Replaced with
  `chess.syzygy.is_tablename()` which has additional parameters and defaults to
  `one_king`.
* Take advantage of `int.bit_count()` coming in Python 3.10.

python-chess v0.31.1

Bugfixes:

* `RacingKingsBoard.is_variant_win()` no longer incorrectly returns `True`
  for drawn positions.
* Multiple moves for EPD opcodes *am* and *bm* are now sorted as required by
  the specification.
* Coordinates of SVG boards are now properly aligned, even when rendered as
  SVG Tiny.

Changes:

* SVG boards now have a background color for the coordinate margin, making
  coordinates readable on dark backgrounds.
* Added *[Variant "Illegal"]* as an alias for standard chess
  (used by Chessbase).

Features:

* Added `Board.find_move()`, useful for finding moves that match human input.

python-chess v0.31.0

Changes:

* Replaced lookup table `chess.BB_BETWEEN[a][b]` with a function
  `chess.between(a, b)`. Improves initialization and runtime performance.
* `chess.pgn.BaseVisitor.result()` is now an abstract method, forcing
  subclasses to implement it.
* Removed helper attributes from `chess.engine.InfoDict`. Instead it is now
  a `TypedDict`.
* `chess.engine.PovScore` equality is now semantic instead of structural:
  Scores compare equal to the negative score from the opposite point of view.

Bugfixes:

* `chess.Board.is_irreversible()` now considers ceding legal en-passant
  captures as irreversible. Also documented that false-negatives due to forced
  lines are by design.
* Fixed stack overflow in `chess.pgn` when exporting, visiting or getting the
   final board of a very long game.
* Clarified documentation regarding board validity.
* `chess.pgn.GameNode.__repr__()` no longer errors if the root node has invalid
  FEN or Variant headers.
* Carriage returns are no longer allowed in PGN header values, fixing
  reparsability.
* Fixed type error when XBoard name or egt features have a value that looks
  like an integer.
* `chess.engine` is now passing type checks with mypy.
* `chess.gaviota` is now passing type checks with mypy.

Features:

* Added `chess.Board.gives_check()`.
* `chess.engine.AnalysisResult.wait()` now returns `chess.engine.BestMove`.
* Added `empty_square` parameter for `chess.Board.unicode()` with better
  aligned default (⭘).

python-chess v0.30.1

Changes:

* Positions with more than two checkers are considered invalid and
  `board.status()` returns `chess.STATUS_TOO_MANY_CHECKERS`.
* Pawns drops in Crazyhouse are considered zeroing and reset
  `board.halfmove_clock` when played.
* Now validating file sizes when opening Syzygy tables and Polyglot opening
  books.
* Explicitly warn about untrusted tablebase files and chess engines.

Bugfixes:

* Fix Racing Kings game end detection: Black cannot catch up if their own
  pieces block the goal. White would win on the turn, so this did not
  impact the game theoretical outcome of the game.
* Fix bugs discovered by fuzzing the EPD parser: Fixed serialization of
  empty strings, reparsability of empty move lists, handling of non-finite
  floats, and handling of whitespace in opcodes.

Features:

* Added `board.checkers()`, returning a set of squares with the pieces giving
  check.

python-chess v0.30.0

Changes:

* **Dropped support for Python 3.5.**
* Remove explicit loop arguments in `chess.engine` module, following
  https://bugs.python.org/issue36373.

Bugfixes:

* `chess.engine.EngineProtocol.returncode` is no longer poisoned when
  `EngineProtocol.quit()` times out.
* `chess.engine.PlayResult.info` was not always of type
  `chess.engine.InfoDict`.

Features:

* The background thread spawned by `chess.engine.SimpleEngine` is now named
  for improved debuggability, revealing the PID of the engine process.
* `chess.engine.EventLoopPolicy` now supports `asyncio.PidfdChildWatcher`
  when running on Python 3.9+ and Linux 5.3+.
* Add `chess.Board.san_and_push()`.

python-chess v0.29.0

Changes:

* `chess.variant.GiveawayBoard` **now starts with castling rights**.
  `chess.variant.AntichessBoard` is the same variant without castling rights.
* UCI info parser no longer reports errors when encountering unknown tokens.
* Performance improvements for repetition detection.
* Since Python 3.8: `chess.syzygy`/`chess.polyglot` use `madvise(MADV_RANDOM)`
  to prepare table/book files for random access.

Bugfixes:

* Fix syntax error in type annotation of `chess.engine.run_in_background()`.
* Fix castling rights when king is exploded in Atomic. Mitigated by the fact
  that the game is over and that it did not affect FEN.
* Fix insufficient material with underpromoted pieces in Crazyhouse. Mitigated
  by the fact that affected positions are unreachable in Crazyhouse.

Features:

* Support `wdl` in UCI info (usually activated with `UCI_ShowWDL`).

python-chess v0.28.3

Bugfixes:

* Follow FICS rules in Atomic castling edge cases.
* Handle self-reported errors by XBoard engines "Error: ..." or
  "Illegal move: ...".

python-chess v0.28.2

Bugfixes:

* Fixed exception propagation, when an UCI engine sends an invalid `bestmove`.
  Thanks @fsmosca.

Changes:

* `chess.Move.from_uci()` no longer accepts moves from and to the same square,
  for example `a1a1`. `0000` is now the only valid null move notation.