DoubleCheck 3.4 (Aart Bik compile - Android)
http://www.aartbik.com/MISC/DATA/doublecheck3.4
http://www.aartbik.com/MISC/DATA/doublecheck3.4
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DiscoCheck 3.5 New name for "DoubleCheck"
Windows-x64, Linux-x64 and sources included!
- no futility pruning of killer moves: scores equal in self-play, but slightly better in tactics.
- futility and eval pruning now done also at PV nodes.
- bugfix: returned the previous iteration move when mate found in certain cases.
- bugfix: print_pv was calling move_to_string with illegal moves.
- run_epd: run an EPD file, produce a nice report of missed positions and total score.
- move_to_san added.
- bugfix: calc_attacks was functionally incorrect, rewritten and speeded it up a little too.
- improved evaluation of connected passed pawns.
A new interesting feature of DiscoCheck is the EPD support, as documented in the readme.txt file!
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
Windows-x64, Linux-x64 and sources included!
- no futility pruning of killer moves: scores equal in self-play, but slightly better in tactics.
- futility and eval pruning now done also at PV nodes.
- bugfix: returned the previous iteration move when mate found in certain cases.
- bugfix: print_pv was calling move_to_string with illegal moves.
- run_epd: run an EPD file, produce a nice report of missed positions and total score.
- move_to_san added.
- bugfix: calc_attacks was functionally incorrect, rewritten and speeded it up a little too.
- improved evaluation of connected passed pawns.
A new interesting feature of DiscoCheck is the EPD support, as documented in the readme.txt file!
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
DiscoCheck 3.5 JA
Windows/Linux/Android 64/32
http://dl.dropbox.com/u/5047625/discocheck-35-ja.zip
http://cl.ly/GbkL/discocheck-35-ja.zip
Windows/Linux/Android 64/32
http://dl.dropbox.com/u/5047625/discocheck-35-ja.zip
http://cl.ly/GbkL/discocheck-35-ja.zip
DiscoCheck 3.51 (Windows-x64, Linux-x64 and sources included!)
- new logo by Jim Ablett!
- many bugfixes.
- introduced a double threat test in the eval pruning.
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
- new logo by Jim Ablett!
- many bugfixes.
- introduced a double threat test in the eval pruning.
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
DiscoCheck 3.5.1 JA
Windows/Linux/Android 64/32
http://dl.dropbox.com/u/5047625/discocheck-351-ja.zip
http://cl.ly/GlIu/discocheck-351-ja.zip
Windows/Linux/Android 64/32
http://dl.dropbox.com/u/5047625/discocheck-351-ja.zip
http://cl.ly/GlIu/discocheck-351-ja.zip
DiscoCheck 3.6
- search: experimental queen threat extension (actually non-reduction at low depth).
- calc_eval: now distinguish the treatement of draws and drawish endgames. When it's a draw the score
is zero, and when it's drawish we still do the relevant eval terms to incentive DC to resist.
- is_drawish: KPK bitbase added, ported the code from Stockfish to generate the bitbase. It doesn't
add any elo, but now DC looks less stupid in some dead drawn endgames!
- id_loop: now there are two time limits, max_time[2]. max_time[0] is the normal time, and
max_time[1] is a higher one used to solve aspiration window fail high/low, for the current iteration.
- search: null move minimum depth condition removed. However intuive this min depth condition seemed,
it was proven to be harmful in testing.
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
- search: experimental queen threat extension (actually non-reduction at low depth).
- calc_eval: now distinguish the treatement of draws and drawish endgames. When it's a draw the score
is zero, and when it's drawish we still do the relevant eval terms to incentive DC to resist.
- is_drawish: KPK bitbase added, ported the code from Stockfish to generate the bitbase. It doesn't
add any elo, but now DC looks less stupid in some dead drawn endgames!
- id_loop: now there are two time limits, max_time[2]. max_time[0] is the normal time, and
max_time[1] is a higher one used to solve aspiration window fail high/low, for the current iteration.
- search: null move minimum depth condition removed. However intuive this min depth condition seemed,
it was proven to be harmful in testing.
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
DiscoCheck 3.6 JA (UCI)
Windows/Linux/Android 64/32
https://dl.dropbox.com/u/5047625/discocheck-36-ja.zip
http://cl.ly/HhVc/discocheck-36-ja.zip
Windows/Linux/Android 64/32
https://dl.dropbox.com/u/5047625/discocheck-36-ja.zip
http://cl.ly/HhVc/discocheck-36-ja.zip
DiscoCheck 3.6.1 (Boney M)
- do_eval_pawns: do not apply the storm bonus to a blocked pawn.
- parse_go: hanle the "movestogo" parameter to the "go" command. At long last, DC now play at tournament time controls!
- gen_msl: for quiet moves from the main search and with a zero history score, postpone the ones that fall on squares attacked by enemy pawns.
- search: increase the move count condition for double reduction at low depths.
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
- do_eval_pawns: do not apply the storm bonus to a blocked pawn.
- parse_go: hanle the "movestogo" parameter to the "go" command. At long last, DC now play at tournament time controls!
- gen_msl: for quiet moves from the main search and with a zero history score, postpone the ones that fall on squares attacked by enemy pawns.
- search: increase the move count condition for double reduction at low depths.
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
DiscoCheck 3.6.1 (UCI)
Windows/Linux/Android 64/32
https://dl.dropbox.com/u/5047625/discocheck-361-ja.zip
http://cl.ly/HqrW/discocheck-361-ja.zip
Windows/Linux/Android 64/32
https://dl.dropbox.com/u/5047625/discocheck-361-ja.zip
http://cl.ly/HqrW/discocheck-361-ja.zip
DiscoCheck 3.6.2
- critical bugfix: a nasty integer signedness error that caused time losses.
- do_eval_pawns: pawn storm bonus is now more gradual.
- search: Null reduction formula changed, from max(4,depth/2) to 3+depth/4, which is somewhat more
standard. Testing at fast tc showed no elo gain (nor regression), but this formula is at least
asymptotically more reasonable, so it should be safer at long tc. Also increase the reduction by 1,
when eval >= beta + Pawn (idea from Stockfish).
- search: LMR re-search condition at PV nodes fixed. Thanks to Matthew Brades for pointing this out.
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
- critical bugfix: a nasty integer signedness error that caused time losses.
- do_eval_pawns: pawn storm bonus is now more gradual.
- search: Null reduction formula changed, from max(4,depth/2) to 3+depth/4, which is somewhat more
standard. Testing at fast tc showed no elo gain (nor regression), but this formula is at least
asymptotically more reasonable, so it should be safer at long tc. Also increase the reduction by 1,
when eval >= beta + Pawn (idea from Stockfish).
- search: LMR re-search condition at PV nodes fixed. Thanks to Matthew Brades for pointing this out.
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
DiscoCheck 3.6.2 JA (UCI)
Windows/Linux/Android 64/32
https://dl.dropbox.com/u/5047625/discocheck-362-ja.zip
http://cl.ly/HxUG/discocheck-362-ja.zip
Windows/Linux/Android 64/32
https://dl.dropbox.com/u/5047625/discocheck-362-ja.zip
http://cl.ly/HxUG/discocheck-362-ja.zip
DiscoCheck 3.7 (Colorblind)
--------------
search: do not research full window at reduced depth, when the zero-window reduced search did not
fail low at non PV nodes (waste of time).
eval: rook trapped by uncastled king penalty
uci: better time usage
uci: TimeBuffer option introduced
search: display mate scores correctly
eval: trapped knight and bishop
uci: AutoClearHash option introduced
(+ bugfixes and code cleanup as usual)
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
--------------
search: do not research full window at reduced depth, when the zero-window reduced search did not
fail low at non PV nodes (waste of time).
eval: rook trapped by uncastled king penalty
uci: better time usage
uci: TimeBuffer option introduced
search: display mate scores correctly
eval: trapped knight and bishop
uci: AutoClearHash option introduced
(+ bugfixes and code cleanup as usual)
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html
DiscoCheck 3.7.1 TM (Win32 build rebuilt, 24-Aug-2012)
http://tmokonen.freehosting.com/DiscoCheck_371_x32_new.rar
http://tmokonen.freehosting.com/DiscoCheck_371_x32_new.rar
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