DiscoCheck

on Fri Nov 04, 2011 12:09 am by **Steve.R** · on Fri Nov 04, 2011 12:09 am by **Steve.R**

DiscoCheck New name for "DoubleCheck" (UCI)
Author: Lucas Braesch, France.
http://wbec-ridderkerk.nl/html/details1/DoubleCheck.html

Last edited by Steve.R on Mon May 14, 2012 4:26 pm; edited 4 times in total (Reason for editing : DiscoCheck New name for "DoubleCheck!!)

on Fri Nov 04, 2011 9:11 pm by **Steve.R** · on Fri Nov 04, 2011 9:11 pm by **Steve.R**

DoubleCheck 2.0 for Android is available
Download
http://www.aartbik.com/MISC/eng.html

on Sat Nov 05, 2011 2:39 pm by **Steve.R** · on Sat Nov 05, 2011 2:39 pm by **Steve.R**

Doublecheck 2.0 JA (Windows/Linux/Android 64/32 p.g.o)
Download
http://jim-ablett.co.de/

on Sat Nov 05, 2011 10:06 pm by **Andres** · on Sat Nov 05, 2011 10:06 pm by **Andres**

New 64 bit linux compile to test using link-time optimizations
http://dl.dropbox.com/u/5047625/doublecheck-20-64-lin-new-ja.zip

on Mon Jan 16, 2012 8:29 am by **Steve.R** · on Mon Jan 16, 2012 8:29 am by **Steve.R**

DoubleCheck 2.4 released

change log:

- search: rewrote the PVS + reduction bit a little. Thanks to Marco Costalba for his advice on this.
- MAX_GAME_PLY now equals 0x400, so games can safely last 0x400-0x80 half-moves before the game stack.
writes out of its allocated memory and crashes everything.
- qsearch: do not write in the TT when the move loop was empty.
- eval: mobility rewritten, should make a bit more sense now.
- search: introduced double reductions for late quiet moves.
- search: do not reduce castling moves.
- search: eval pruning rather than reduce.

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

on Tue Jan 17, 2012 7:38 am by **Steve.R** · on Tue Jan 17, 2012 7:38 am by **Steve.R**

DoubleCheck 2.4 JA
Windows/Linux/Android 64/32 p.g.o

Download:
http://dl.dropbox.com/u/5047625/doublecheck-24-ja.zip
Mirror:
http://cl.ly/DNU8/doublecheck-24-ja.zip

on Sun Jan 22, 2012 12:47 pm by **Steve.R** · on Sun Jan 22, 2012 12:47 pm by **Steve.R**

DoubleCheck 2.5 released
(Windows-x64, Linux-x64 and sources included!)

change log:

Essentially it fixes a time bug, and introduces a king attack evaluation component.
About +70 elo in self-play.

- eval: added a very simplistic king attack bonus mechanism.
- bugfix: doubled the node polling frequency to avoid time losses.

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

on Sun Jan 22, 2012 7:23 pm by **karakan** · on Sun Jan 22, 2012 7:23 pm by **karakan**

DoubleCheck 2.5 - mirror download

on Sun Jan 22, 2012 10:54 pm by Hossam · on Sun Jan 22, 2012 10:54 pm by Hossam

Doublecheck 2.5 JA
http://dl.dropbox.com/u/5047625/doublecheck-25-ja.zip
http://cl.ly/DWqp/doublecheck-25-ja.zip

on Sat Jan 28, 2012 7:26 pm by **Steve.R** · on Sat Jan 28, 2012 7:26 pm by **Steve.R**

DoubleCheck 2.51 released

change log:
- eval: added candidate passed pawns.
- bugfix: report correct version number.

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

on Sun Jan 29, 2012 6:06 am by **Steve.R** · on Sun Jan 29, 2012 6:06 am by **Steve.R**

DoubleCheck 2.52 released

change log:
- eval: removed candidate passed pawns.
- eval: reduced penalty when a passed pawn is not part of a pawn chain.

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

on Mon Feb 06, 2012 5:08 am by jnhes · on Mon Feb 06, 2012 5:08 am by jnhes

DoubleCheck 2.5.3
-----------------
- move_ok: rewritten efficiently (first step to prepare the lazy move ordering).
- rook and bishop promotions can be disabled (in search, not perft) with SubPromotions in movegen.c
- gen_msl: precalculate SEE only for captures.

http://www.wbec-ridderkerk.nl/html/downloada/doublecheck/DoubleCheck_253.zip

on Wed Feb 08, 2012 3:55 pm by **Steve.R** · on Wed Feb 08, 2012 3:55 pm by **Steve.R**

DoubleCheck 2.54 released

change log:
- bugfix: free passer bonus was attributed when pieces were in the way, i/o the opposite.
- bugfix: relative king distance was too preponderant in the passed pawn scoring.
- bugfix: KRRBKRR was incorrectly recognized as a draw.

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

on Thu Feb 09, 2012 7:41 pm by **Steve.R** · on Thu Feb 09, 2012 7:41 pm by **Steve.R**

DoubleCheck 2.5.4 JA
Windows/Linux/Android 64/32

Download:
http://dl.dropbox.com/u/5047625/doublecheck-254-ja.zip
Mirror:
http://cl.ly/E3vm/doublecheck-254-ja.zip

on Sat Feb 11, 2012 6:06 am by **Steve.R** · on Sat Feb 11, 2012 6:06 am by **Steve.R**

DoubleCheck 2.5.4 (Mac PPC build by Matthew)
http://www.thelumpit.net/DoubleCheck_254_Mac.zip