Tags: andyInn/python-chess
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python-chess v0.19.0
New features:
* **Experimental XBoard engine support.** Thanks to Manik Charan and
Cash Costello. Expect breaking changes in future releases.
* Added an undocumented `chess.polyglot.ZobristHasher` to make Zobrist hashing
easier to extend.
Bugfixes:
* Merely pseudo-legal en passant does no longer count for repetitions.
* Fixed repetition detection in Three-Check and Crazyhouse. (Previously
check counters and pockets were ignored.)
* Checking moves in Three-Check are now considered as irreversible by
`ThreeCheckBoard.is_irreversible()`.
* `chess.Move.from_uci("")` was raising `IndexError` instead of `ValueError`.
Thanks Jonny Balls.
Changes:
* `chess.syzygy.Tablebases` constructor no longer supports directly opening
a directory. Use `chess.syzygy.open_tablebases()`.
* `chess.gaviota.PythonTablebases` and `NativeTablebases` constructors
no longer support directly opening a directory.
Use `chess.gaviota.open_tablebases()`.
* `chess.Board` instances are now compared by the position they represent,
not by exact match of the internal data structures (or even move history).
* Relaxed castling right validation in Chess960: Kings/rooks of opposing sites
are no longer required to be on the same file.
* Removed misnamed `Piece.__unicode__()` and `BaseBoard.__unicode__()`. Use
`Piece.unicode_symbol()` and `BaseBoard.unicode()` instead.
* Changed `chess.SquareSet.__repr__()`.
* Support `[Variant "normal"]` in PGNs.
* `pip install python-chess[engine]` instead of `python-chess[uci]` (since
the extra dependencies are required for both UCI and XBoard engines).
* Mixed documentation fixes and improvements.
python-chess v0.18.2 Bugfixes: * Fixed castling in atomic chess when there is a rank attack. * The halfmove clock in Crazyhouse is no longer incremented unconditionally. `CrazyhouseBoard.is_zeroing(move)` now considers pawn moves and captures as zeroing. Added `Board.is_irreversible(move)` that can be used instead. * Fixed an inconsistency where the `chess.pgn` tokenizer accepts long algebraic notation but `Board.parse_san()` did not. Changes: * Added more NAG constants in `chess.pgn`.
python-chess v0.18.1 Bugfixes: * Crazyhouse drops were accepted as pseudo legal (and legal) even if the respective piece was not in the pocket. * `CrazyhouseBoard.pop()` was failing to undo en passant moves. * `CrazyhouseBoard.pop()` was always returning `None`. * `Move.__copy__()` was failing to copy Crazyhouse drops. * Fix ~ order (marker for promoted pieces) in FENs. * Promoted pieces in Crazyhouse were not communicated with UCI engines. Changes: * `ThreeCheckBoard.uci_variant` changed from `threecheck` to `3check`.
python-chess v0.18.0 Bugfixes: * Fixed `Board.parse_uci()` for crazyhouse drops. Thanks to Ryan Delaney. * Fixed `AtomicBoard.is_insufficient_material()`. * Fixed signature of `SuicideBoard.was_into_check()`. * Explicitly close input and output streams when a `chess.uci.PopenProcess` terminates. * The documentation of `Board.attackers()` was wrongly stating that en passant capturable pawns are considered attacked. Changes: * `chess.SquareSet` is no longer hashable (since it is mutable). * Removed functions and constants deprecated in v0.17.0. * Dropped `gmpy2` and `gmpy` as optional dependencies. They were no longer improving performance. * Various tweaks and optimizations for 5% improvement in PGN parsing and perft speed. (Signature of `_is_safe` and `_ep_skewered` changed). * Rewritten `chess.svg.board()` using `xml.etree`. No longer supports *pre* and *post*. Use an XML parser if you need to modify the SVG. Now only inserts actually used piece defintions. * Untangled UCI process and engine instanciation, changing signatures of constructors and allowing arbitrary arguments to `subprocess.Popen`. * Coding style and documentation improvements. New features: * `chess.svg.board()` now supports arrows. Thanks to @rheber for implementing this feature. * Let `chess.uci.PopenEngine` consistently handle Ctrl+C across platforms and Python versions. `chess.uci.popen_engine()` now supports a `setpgrp` keyword argument to start the engine process in a new process group. Thanks to @dubiousjim. * Added `board.king(color)` to find the (royal) king of a given side. * SVGs now have `viewBox` and `chess.svg.board(size=None)` supports and defaults to `None` (i.e. scaling to the size of the container).
python-chess v0.17.0 Changes: * Rewritten move generator, various performance tweaks, code simplications (500 lines removed) amounting to **doubled PGN parsing and perft speed**. * Removed `board.generate_evasions()` and `board.generate_non_evasions()`. * Removed `board.transpositions`. Transpositions are now counted on demand. * `file_index()`, `rank_index()`, and `pop_count()` have been renamed to `square_file()`, `square_rank()` and `popcount()` respectively. Aliases will be removed in some future release. * `STATUS_ILLEGAL_CHECK` has been renamed to `STATUS_RACE_CHECK`. The alias will be removed in a future release. * Removed `DIAG_ATTACKS_NE`, `DIAG_ATTACKS_NW`, `RANK_ATTACKS` and `FILE_ATTACKS` as well as the corresponding masks. New attack tables `BB_DIAG_ATTACKS` (combined both diagonal tables), `BB_RANK_ATTACKS` and `BB_FILE_ATTACKS` are indexed by square instead of mask. * `board.push()` no longer requires pseudo-legality. * Documentation improvements. Bugfixes: * **Positions in variant end are now guaranteed to have no legal moves.** `board.is_variant_end()` has been added to test for special variant end conditions. Thanks to salvador-dali. * `chess.svg`: Fixed a typo in the class names of black queens. Fixed fill color for black rooks and queens. Added SVG Tiny support. These combined changes fix display in a number of applications, including Jupyter Qt Console. Thanks to Alexander Meshcheryakov. * `board.ep_square` was not consistently `None` instead of `0`. * Detect invalid racing kings positions: `STATUS_RACE_OVER`, `STATUS_RACE_MATERIAL`. * `SAN_REGEX`, `FEN_CASTLING_REGEX` and `TAG_REGEX` now try to match the entire string and no longer accept newlines. * Fixed `Move.__hash__()` for drops. New features: * `board.remove_piece_at()` now returns the removed piece. * Added `square_distance()` and `square_mirror()`. * Added `msb()`, `lsb()`, `scan_reversed()` and `scan_forward()`. * Added `BB_RAYS` and `BB_BETWEEN`.
python-chess v0.16.2 Changes: * `board.move_stack` now contains the exact move objects added with `Board.push()` (instead of normalized copies for castling moves). This ensures they can be used with `Board.variation_san()` amongst others. * `board.ep_square` is now `None` instead of `0` for no en passant square. * `chess.svg`: Better vector graphics for knights. Thanks to ProgramFox. * Documentation improvements.
python-chess v0.16.0 Bugfixes: * `pin_mask()`, `pin()` and `is_pinned()` make more sense when already in check. Thanks to Ferdinand Mosca. New features: * **Variant support: Suicide, Giveaway, Atomic, King of the Hill, Racing Kings, Horde, Three-check, Crazyhouse.** `chess.Move` now supports drops. * More fine grained dependencies. Use *pip install python-chess[uci,gaviota]* to install dependencies for the full feature set. * Added `chess.STATUS_EMPTY` and `chess.STATUS_ILLEGAL_CHECK`. * The `board.promoted` mask keeps track of promoted pieces. * Optionally copy boards without the move stack: `board.copy(stack=False)`. * `examples/bratko_kopec` now supports avoid move (am), variants and displays fractional scores immidiately. Thanks to Daniel Dugovic. * `perft.py` rewritten with multi-threading support and moved to `examples/perft`. * `chess.syzygy.dependencies()`, `chess.syzygy.all_dependencies()` to generate Syzygy tablebase dependencies. Changes: * **Endgame tablebase probing (Syzygy, Gaviota):** `probe_wdl()` **,** `probe_dtz()` **and** `probe_dtm()` **now raise** `KeyError` **or** `MissingTableError` **instead of returning** *None*. If you prefer getting `None` in case of an error use `get_wdl()`, `get_dtz()` and `get_dtm()`. * `chess.pgn.BaseVisitor.result()` returns `True` by default and is no longer used by `chess.pgn.read_game()` if no game was found. * Non-fast-forward update of the Git repository to reduce size (old binary test assets removed). * `board.pop()` now uses a boardstate stack to undo moves. * `uci.engine.position()` will send the move history only until the latest zeroing move. * Optimize `board.clean_castling_rights()` and micro-optimizations improving PGN parser performance by around 20%. * Syzygy tables now directly use the endgame name as hash keys. * Improve test performance (especially on Travis CI). * Documentation updates and improvements.
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