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DiscoCheck

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Code:

Games Completed = 500 of 500 (Avg game length = 30.132 sec)
Settings = RR/32MB/4000ms+200ms/M 700000cp for 7 moves, D 150 moves/EPD:E:\LittleBlitzer\openings.epd(4000)
Time = 3802 sec elapsed, 0 sec remaining

 1.  DoubleCheck 3.2 JA         256.0/500   165-153-182     (L: m=142 t=11 i=0 a=0)   (D: r=140 i=25 f=9 s=3 a=5)   (tpm=241.2 d=12.8 nps=0)
 2.  DoubleCheck 3.1 JA         244.0/500   153-165-182     (L: m=162 t=3 i=0 a=0)   (D: r=140 i=25 f=9 s=3 a=5)   (tpm=241.1 d=12.6 nps=0)

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DoubleCheck 3.3 (Windows-x64, Linux-x64 and sources included!)

- eval: added candidate passed pawns.
- tt: generation SF style: todo
- pack move_t into 16 bits: in progress
- board: pack move_t to 16 bits.
- eval: knight and bishop outposts.
- eval: improved passed pawn scoring.

http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html

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DoubleCheck 3.3 JA

Windows/Linux/Android 64/32

http://dl.dropbox.com/u/5047625/doublecheck-33-ja.zip
http://cl.ly/G1B0/doublecheck-33-ja.zip

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DoubleCheck 3.4

- tuned king safety weights.
- rewritten and tuned passed pawns eval.

http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html

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DoubleCheck 3.4 JA

Windows/Linux/Android 64/32

http://dl.dropbox.com/u/5047625/doublecheck-34-ja.zip
http://cl.ly/G8pX/doublecheck-34-ja.zip

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DoubleCheck 3.4 (Aart Bik compile - Android)
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

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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

DiscoCheck - Page 2 Discoc10

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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

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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

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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

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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

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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

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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

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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

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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

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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

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DiscoCheck 3.71 - Bugfix
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html

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DiscoCheck 3.7.1 TM w32
http://tmokonen.freehosting.com/DiscoCheck_371_x32.rar

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DiscoCheck 3.7.1 TM (Win32 build rebuilt, 24-Aug-2012)
http://tmokonen.freehosting.com/DiscoCheck_371_x32_new.rar

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Own homepage for DiscoCheck (only sources at the moment)
"A 4.0 version is baking, and is almost ready. It will be nicknamed Dschinghis Khan, following the logic of naming with Disco band names (now letter D, as fourth version of the "disco era""
Homepage link: https://github.com/lucasart/chess

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DiscoCheck 4.0.0 JA

Windows/Linux/Android 64/32

https://dl.dropbox.com/u/5047625/discocheck-400-ja.zip
http://cl.ly/MScR/discocheck-400-ja.zip

Android version (direct link):
https://dl.dropbox.com/u/5047625/discocheck-400-android-ja

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DiscoCheck 4.0.1 JA

Windows/Linux/Android 64/32

https://dl.dropbox.com/u/5047625/discocheck-401-ja.zip
http://cl.ly/MSiF/discocheck-401-ja.zip

Android version (direct link):
https://dl.dropbox.com/u/5047625/discocheck-android-ja

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DiscoCheck 4.0.2

- Linux64 build only
- bishop trap on A/H 3/6 added (functional change, microscopic elo gain if any)
- popcount hardware support added (so people can product fast compiles without having to modify the code)

https://github.com/lucasart/chess/tree/master/bin

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DiscoCheck 4.0.3
- added bishop X-ray threats.
https://github.com/lucasart/chess/tree/master/bin

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