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- GNU CHESS HISTORY
- (current version 1.17.89)
-
- April 30, 1989 -- Various GNU contributors
- setlinebuf() modification for xchess/chesstool.
- check for zero division in time printout.
-
- January 17, 1989 -- Anders Thulin
- Provided extensive addition to the opening book for his
- favorite opening the Vienna Game. This was drawn from ECO.
-
- November 23, 1988 -- Stuart Cracraft
- Installed new version of Xchess that is better debugged, works on
- the next version of X. Thanks to Wayne Christopher and Arturo Perez.
-
- August 28, 1988 -- Stuart Cracraft
- Removed a sacrifice line from the Giuoco Piano entry in the opening
- book; the program didn't seem to like the positions it got from this line.
-
- December 30, 1987 -- John Stanback
- Wrote a short blurb on the heuristics contained in GNU Chess. It resides
- in the subdirectory DOCUMENTATION as the file HEURISTICS.
-
- December 17, 1987 -- John Stanback
- Modified criteria for positional evaluation in quiescence search
- to include positions in which the estimated score lies within
- the alpha-beta window; fixed a bug in the king proximity to pawns heuristic;
- fixed a bug involving passed pawn heuristics;
-
- December 16, 1987 -- Stuart Cracraft
- Added automatic 'list' upon exit (both in display, non-display, and
- chesstool mode); command-line setting of tournament time controls
- bug fixed.
-
- December 14, 1987 -- John Stanback
- GNU defeated the commercial product 'Fidelity Excellence' 5.5-4.5 in
- a 10-game match. It was running at about 500 nodes per second (typical
- of its speed on a VAX 8650) and this would indicate its strength
- would be about USCF 1875-1900.
-
- December 4, 1987 -- John Stanback
- Man page added. Command line arguments now specify regular clock
- settings if so desired (useful for SUN players). Thinking
- on opponent's time is now disabled by default. Estimated
- rating is 1850 at 500 nodes per second.
-
- October 20, 1987 -- Stuart Cracraft
- Fixed GNU/SUN interaction. Chesstool and its features now
- seem to fully work.
-
- October 5, 1987 -- Ken Thompson
- GNU beat Belle (actually drew due to a bug, but
- Ken kept GNU playing through to the win) while
- running on a Cray XMP-48. In this 3-1 time handicap game
- Belle outsearched Cray GNU by 10-1 (even with the handicap).
-
- September 26, 1987 -- John Stanback at HP
- Hash table functioning. Thinking on opponent's
- time functioning.
-
- August 20, 1987 -- Mike Meyer at Berkeley
- Mike ran GNU Chess on a Cray 1 supercomputer.
- The system was very heavily loaded, so the
- program was not as speedy as with the Cray below.
-
- August 16, 1987 -- David Goldberg at SUN
- He added "chesstool" support so that this
- version of GNU Chess can run under the
- display manager "chesstool".
-
- August 15, 1987 -- John Stanback at HP
- Hash tables, more heuristics, a modified
- search which is more efficient. He also
- discovered a bug in the piece-exchanger. This
- would cause the program to exchange pieces suboptimally.
- With this fix, the program should play much
- more strongly.
-
- August 13, 1987 -- Ken Thompson at Bell Labs
- Ken ran GNU Chess on a Cray XMP supercomputer
- (among other processors). The program got
- about 3000-4000 chess positions per second
- which is comprable to today's fastest bit-slice
- commercial machines. Also, he had GNU Chess
- play two games against Belle.
-
- July 19, 1987 -- Jay Scott & John Stanback
- Many positional heuristics have been added.
-
- July 18, 1987 -- Stuart Cracraft
- Improvements have been made to the opening
- book. It is mostly an MCO book, containing
- major variations from many of the major openings
- and particularly in-depth on Sicilian.
-
- May 11, 1987 -- John Stanback at HP
- He donated his chess program, a fairly mature
- and strong program.
-
- May 1, 1987 -- Stuart Cracraft
- He added several bug fixes various people
- had reported. He also changed makemove() so that
- the calling syntax is makemove(movelist,index,board)
- rather than makemove(move,board). Having the latter
- tickled a bug in at least one manufacturer's C-compiler,
- so rather than write fancy code, we simplified it.
-
- April 25, 1987-- Jim Aspnes at MIT
- He added all sorts of useful capabilities,
- including positional evaluation in the tree
- search using a table-driven algorithm,
- modifying transposition table code in order
- to work properly, though it doesn't improve
- speed too much, checkmates/stalemates detected
- in the search, en passant captures allowed,
- detect repeated positions, iterative deepening,
- quicker quiescence search, tournament time controls,
- sqattacked sped up by a factor of 4, compile-time
- debugging options.
-
- January 2, 1987 -- Stuart Cracraft
- He added a few more Tal games to the collection.
-
- January 2, 1987 -- Jim Aspnes at MIT
- He contributed MCO variations for the Catalan,
- Queen's Indian, and Reti openings.
-
- December 29, 1986 -- Jim Aspnes at MIT
- He contributed all MCO variations of the Najdorf
- to the opening book. He also contributed a LISP
- macro (written in GNU Emacs Lisp) to convert
- xchess game formats to GNU Chess opening book
- format.
-
- December 14, 1986 -- Ken Thompson at Bell Labs
- He contributed almost 200 games by Tal to
- our collection of Tal-games, bringing the
- total number of Tal positions in the book
- to 10,692. Total book positions now 13,207.
- These reside in bookin, bookin.bdg, bookin.tal.
- Note that presently, only bookin and bookin.tal
- can be used. The new Tal positions came in a
- slightly different format, which we have chosen
- to adopt as our standard format. All book
- games in bookin and bookin.bdg will gradually
- change into the new standard format.
-
- December 11, 1986 -- Stuart Cracraft
- Added "averages" for node-count per move,
- cpu per move, rate per move to list_history
- and write_history.
- New version of Xchess installed.
- Started typing in Tal games into "bookin.tal".
- Added "total book positions" printout to "book"
- and "enter" statistics printout.
-
- December 10, 1986 -- Stuart Cracraft
- Implemented aspiration search in normal
- alpha-beta search. Speedups of 3% to 40%
- have been noticed in most positions.
- Occasionally a slower search will result,
- but it is thought these are worth the
- usual speedups.
-
- December 9, 1986 -- Stuart Cracraft
- Fixed minor bug in write_history()
- Added another Tal game, 2nd game of 1st world
- championship match with Botvinnik, a Benoni.
-
- December 9, 1986 -- Stuart Cracraft
- Enhanced parallelism. All parallel processors
- now communicate via a shared data file and
- are kept running (in idle loops watching the
- shared data file). This saves us a few seconds
- on each move since the 'rsh' need not be invoked
- more than once (at the beginning). Since the
- shared data file is now implemented, we will
- next work towards a "parallel anarchy" in which
- any processor can use any other processor in
- order to reduce its search. The current scheme
- with the program being only as fast as its slowest
- processor, is quite inefficient.
-
- December 1, 1986 -- Jim Aspnes at MIT
- Added a couple of Master games from
- Modern Chess Openings 12 (a Fischer game,
- and a Matanovic game).
-
- November 30, 1986 -- Stuart Cracraft
- Added parallelism. Can now handle multiple
- processors (sharing same disk). Later we will
- add the capability to use processors not sharing
- the same disk. Modified README and MAN-PAGE.
-
- November 26, 1986 -- Stuart Cracraft
- Fixed a few bugs in book-mailing mechanism.
- Fixed a bug regarding situations where only
- one move is available.
- Fixed a bug in read_history() that caused
- Black queenside castles to be mishandled.
-
- November 25, 1986 -- Stuart Cracraft
- Added two pawn heuristics. Reward pawns moving into
- a phalanx of pawns. A phalanx is two or more
- horizontally-connected pawns. Likewise, penalize
- pawns leaving a phalanx of pawns. The penalty for
- leaving is a little more than the reward for
- entering.
-
- November 24, 1986 -- Stuart Cracraft
- A user reported an unbelievable bug. Investigation
- of this bug led to the discovery that GNU Chess was
- not picking the move judged best by the tree search
- in all cases. This resulted in the bug showing
- itself which further showed that the program was
- selecting an inferior move. This may result in an
- improvement to the program's play.
-
- November 24, 1986 -- Stuart Cracraft
- Added two heuristics. Penalize king moves if
- the king hasn't castled yet. Also, penalize pawn
- moves which produce doubled pawns. Should
- probably have something for isolated pawns
- too.
-
- November 23, 1986 -- Wayne Christopher at Berkeley
- New version of X chess display front-end.
- Fixed bugs include multiple pieces, runs
- on SUNS & Bobcats, loads saved games.
-
- November 23, 1986 -- Stuart Cracraft
- Cleaned up some minor bugs regarding history.
- Added "Illegal command" error message at Wayne's
- request.
-
- November 22, 1986 -- David Goldberg at SUN Microsystems
- He complained that GNU Chess was memory-hungry.
- A few minor modifications to hash.c reduced
- uninitialized data space 87% and text space
- 12%. This should make it easier for GNU Chess
- to run on small computers.
-
- November 22, 1986 -- Stuart Cracraft
- "read" command was working, but needed
- additional tweaking so that history
- array would be printed by list_history().
-
- November 19, 1986 -- Stuart Cracraft
- Added "read" command which reads a history
- file (game listing) and restores the board
- to as if the person was still playing that.
- particular game. Generally cleaned up
- history mechanism, made it more orthogonal.
- Revised README. Added doc to MAN-PAGE.
-
- November 16, 1986 -- Stuart Cracraft
- More opening book bugs found and fixed.
- Added capability to accept abbreviated-algebraic notation
- for entering "book" games from files.
- Added approximately 2500 new positions to
- opening book from games involving the
- opening called Blackmar-Diemer Gambit,
- a hoary line developed by Diemer in
- Germany years ago.
-
- November 15, 1986 -- Wayne Christopher at Berkeley
- He modified the move generator, resulting in
- a 28% speedup.
-
- November 14, 1986 -- Stuart Cracraft
- He documented a lot of the GNU Chess modules
- with brief comments for each function. More
- extensive internal documentation may go in
- later.
-
- November 14, 1986 -- Wayne Christopher at Berkeley
- He created the Xchess interface for
- GNU Chess to have windowing with X windows.
-
- November 14, 1986 -- Stuart Cracraft
- He added a "randomization" feature to
- the opening book. This will cause the
- program to select randomly from alternate
- variations whenever -DBEST is removed
- from Makefile's CFLAGS. If this is not
- removed, the opening play selects the
- first move found in the book as it appears
- "in order" in the human-readable book.
-
- November 14, 1986 -- David Goldberg at SUN Microsystems
- He responded to a query about dbm(3) which
- eventually resulted in the fixing of a subtle
- bug in the book code which was causing the
- program to sometimes hash to the incorrect
- address and thereby produce a book move which
- didn't even exist in the book. Thanks David!
-
- November 14, 1986 -- Stuart Cracraft
- He added the "oboard" routine in util.c. This
- is the reverse of the already extant "iboard"
- (same module). These two routines translate
- between GNU Chess internal format and
- Forsythe notation.
-
- November 10, 1986 -- Stuart Cracraft
- He added the "enter" command. This causes
- the current game to be entered in the book.
- Then, GNU Chess tries to mail this new entry
- to the book maintainers (for inclusion in
- the master copy of the book).
-
- November 9, 1986 -- Stuart Cracraft
- He added code for an opening book. MAN-PAGE
- and README were modified accordingly.
-
- November 8, 1986 -- Stuart Cracraft
- Checks and mates are now noticed at ply-1.
- This is a more complete fix to the Oct 31 fix.
-
- October 31, 1986 -- Stuart Cracraft
- First attempt at fix to bug which causes
- program to check human's king when program
- itself is in check.
-
- October 31, 1986 -- Mly at MIT
- Reported a bug which caused program to crash
- when an illegal human move was played. Fixed.
- Also, program was unable to play as White. Fixed.
-
- October 22, 1986 -- Stuart Cracraft
- Pps now rewards moves which liberate bishops.
-
- October 19, 1986 -- Stuart Cracraft
- Added bitmapper routines to distribution.
- Added version notice.
-
- October 19, 1986 -- David Goldberg at SUN Microsystems
- Interfaced GNU Chess with SUN's chesstool.
-
- October 18, 1986 -- Initial release date.
-
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