GNU Go 3.1.28 released March 24, 2002

This release includes Arend Bayer's revised hashing scheme,
which is a good speedup. I moved the definition of
HASHING_SCHEME to config.h. I made the new scheme
default. If you want the old behavior, you can configure
--disable-experimental-hashing. There is no configure
support for a third hashing scheme in this release.

Patches in this release:

gofun_1_28.1. New tests. 
hash_1_28.4. Hashing scheme revised.
warnings_1_28.1. Compiler warnings fixed. 
gunnar_1_28.9. Doc patch. 
gunnar_1_28.8. Cleanup patch. 
gunnar_1_28.7. Doc patch. 
gunnar_1_28.6. Bugfix and 1D conversion in confirm_safety(). 
tuning_1_28.1. Tuning. 
gunnar_1_28.5. Doc patch. 
komaster_1_28.1. Gunnar's proposed new komaster scheme. 
gunnar_1_28.4. Atari_atari patch. 
doc_1_28.3. Doc revision. 
gunnar_1_28.3. Regression patch. 
gunnar_1_28.2. Doc patch. 
doc_1_28.2. Doc revision. 
owl_speedup_1_28.1. 
twogtp_1_28.1. Twogtp must close the file when the engine crashes. 
twogtp_1_28.2. Same correction (and another) for twogtp-a. 
influence_doc_1_28.1. 
bugfix_1_28.2. Remember to set gameinfo->to_move. 
bugfix_1_28.1. Repairs printsgf, broken by gunnar_1_28.1. 
gunnar_1_28.1.gz. Fabled undoing. 
trevor_1_28.1. added several .h files to .dsp files 
trevor_1_28.2. reading.tst results. 
trevor_1_28.3. komaster. 
doc_1_28.1.gz. Big documentation patch, copyright notices updated. 
unused_1_27.1. A used unused patch. 

- hashing dependent on compiler switches, default 64 bit and no full position
- default cache size set to 8
- --stack option and showstack global variable removed
- cache.o removed from libboard.a
- unneeded include of dfa.h removed from patterns.h
- compiler warnings fixed: dragon2_func prototyped, etc.
- bugfix in confirm_safety() plus 1D conversion
- komaster scheme 5 implemented and made default
- update_aa_goal() in combination.c revised
- heuristics to estimate cost of pattern constraint introduced
- constraint cost used in owl callback for speedup
- twogtp and twogtp-a close the sgf file if an engine crashes
- twogtp-a had coordinates reversed
- global variable last_moves[] removed
- move history added to board state
- static function undo_move() in board.c renamed to undo_trymove()
- new global functions store_board(), restore_board(), undo_move(),
  get_last_opponent_move(), and get_last_move() in board.c 
- macros do_add_stone() and do_remove_stone() removed from board.c
- Position struct removed
- Gameinfo struct revised
- new board_state struct
- API functions gnugo_* work on an internal board state instead of on
  an externally provided board state
- board_size workaround in influence.c obsoleted and removed
- revised order of operations in main.c; in particular playing up the
  position specified by -l and -L options centralized
- revised modes for --score option
- all undo implementations in GTP, GMP, and ASCII interfaces replaced
  by the new undo_move() function in the board code
- Added several .h files to appropriate .dsp files
- corrected gcc warnings & other cleanup in mkpat.c
- komaster_to_string now takes 2 arguments
- new KOMASTER_TRACE; set to log all komaster_trymove calls
- dfa ise announced only as a debug message
- copyright notices updated
- DRAGON2 macro array bounds checking is not the default
- tuning
- test revision
- doc revision
- additional correct answers added to reading.tst