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Names: »CHANGES«
└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
└─⟦this⟧ »EUUGD11/gnu-31mar87/chess/CHANGES«
GNU CHESS HISTORY (current version 1.2.87) January 2, 1987 -- Stuart Cracraft at UCLA 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 at UCLA 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 at UCLA 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 at UCLA 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 at UCLA 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 -- ASP at MIT Athena Added a couple of Master games from Modern Chess Openings 12 (a Fischer game, and a Matanovic game). November 30, 1986 -- Stuart Cracraft at UCLA 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 at UCLA 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 at UCLA 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 at UCLA 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 at UCLA 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 at UCLA 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 at UCLA "read" command was working, but needed additional tweaking so that history array would be printed by list_history(). November 19, 1986 -- Stuart Cracraft at UCLA 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 at UCLA 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 at UCLA 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 at UCLA 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 at UCLA 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 at UCLA 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 at UCLA He added code for an opening book. MAN-PAGE and README were modified accordingly. November 8, 1986 -- Stuart Cracraft at UCLA 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 at UCLA 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 at UCLA Pps now rewards moves which liberate bishops. October 19, 1986 -- Stuart Cracraft at UCLA 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.