chessforyou Bettina&Terry77

chessforyou Bettina&Terry77

HomeCalendarFAQRegisterLog in
WELCOME TO FORUM OF Angels77 * named in memory of Bettina & Terry
Search
 
 

Display results as :
 
Rechercher Advanced Search
Search
 
 

Display results as :
 
Rechercher Advanced Search
Latest topics
» YLCET Season 2, Final latest Stockfish v/s latest Komodo ....150 @ 60'+10" time control 36 Cores
Yesterday at 5:20 pm by Belladonna

» Ranomi 08/02/18 bin
Tue Feb 20, 2018 11:11 am by st peter

» Matefinder Compiles by Joseph Ellis
Tue Feb 20, 2018 10:52 am by st peter

» Testrun of Stockfish 180209 finished. Nice progress: +8 Elo to Stockfish 9
Mon Feb 19, 2018 2:03 pm by LondonFrau

» Brainfish New book + engine.
Sat Feb 17, 2018 10:38 am by Play4Fun

» Sting SF 9.8 update By Marek Kwiatkowski
Fri Feb 16, 2018 6:34 pm by Belladonna

» asmFishW 2018-02-15
Fri Feb 16, 2018 10:49 am by "B"

» McBrain v9 by Michael Byrne
Wed Feb 14, 2018 3:15 am by "B"

» asmFishW 2018-02-11
Mon Feb 12, 2018 5:16 pm by "B"

Latest topics
» YLCET Season 2, Final latest Stockfish v/s latest Komodo ....150 @ 60'+10" time control 36 Cores
Yesterday at 5:20 pm by Belladonna

» Ranomi 08/02/18 bin
Tue Feb 20, 2018 11:11 am by st peter

» Matefinder Compiles by Joseph Ellis
Tue Feb 20, 2018 10:52 am by st peter

» Testrun of Stockfish 180209 finished. Nice progress: +8 Elo to Stockfish 9
Mon Feb 19, 2018 2:03 pm by LondonFrau

» Brainfish New book + engine.
Sat Feb 17, 2018 10:38 am by Play4Fun

» Sting SF 9.8 update By Marek Kwiatkowski
Fri Feb 16, 2018 6:34 pm by Belladonna

» asmFishW 2018-02-15
Fri Feb 16, 2018 10:49 am by "B"

» McBrain v9 by Michael Byrne
Wed Feb 14, 2018 3:15 am by "B"

» asmFishW 2018-02-11
Mon Feb 12, 2018 5:16 pm by "B"

Navigation
 Portal
 Index
 Memberlist
 Profile
 FAQ
 Search
Navigation
 Portal
 Index
 Memberlist
 Profile
 FAQ
 Search
Forum
Forum
Affiliates
free forum
 


Affiliates
free forum
 



Share | 
 

  SF 9 !! latest version !! Introduce dynamic contempt

Go down 
AuthorMessage
Wendy D Green
Madam
Madam
avatar

Female Posts : 156
Reputation : 517
Join date : 2012-11-08
Location : Ten men waiting for me at the door? Send Rabbi Mordecai home, I'm tired of kosher pork Moslem meats Richer

PostSubject: SF 9 !! latest version !! Introduce dynamic contempt    Fri Feb 09, 2018 10:11 pm

[You must be registered and logged in to see this link.]
[You must be registered and logged in to see this link.]
[You must be registered and logged in to see this link.]
[You must be registered and logged in to see this link.]
[You must be registered and logged in to see this link.]
[You must be registered and logged in to see this link.]
[You must be registered and logged in to see this link.]
Author: Stefano Cardanobile
Date: Fri Feb 9 19:07:19 2018 +0100
Timestamp: 1518199639

Introduce dynamic contempt

Make contempt dependent on the current score of the root position.

The idea is that we now use a linear formula like the following to decide
on the contempt to use during a search :

contempt = x + y * eval

where x is the base contempt set by the user in the "Contempt" UCI option,
and y * eval is the dynamic part which adapts itself to the estimation of
the evaluation of the root position returned by the search. In this patch,
we use x = 18 centipawns by default, and the y * eval correction can go
from -20 centipawns if the root eval is less than -2.0 pawns, up to +20
centipawns when the root eval is more than 2.0 pawns.

To summarize, the new contempt goes from -0.02 to 0.38 pawns, depending if
Stockfish is losing or winning, with an average value of 0.18 pawns by default.

STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 110052 W: 24614 L: 23938 D: 61500
[You must be registered and logged in to see this link.]

LTC:
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 16470 W: 2896 L: 2705 D: 10869
[You must be registered and logged in to see this link.]

A second match at LTC was organised against the current master:

ELO: 1.45 +-2.9 (95%) LOS: 84.0%
Total: 19369 W: 3350 L: 3269 D: 12750
[You must be registered and logged in to see this link.]

Finally, we checked that there is no apparent problem with multithreading,
despite the fact that some threads might have a slightly different contempt
level that the main thread.

Match of this version against master, both using 5 threads, time control 30+0.3:
ELO: 2.18 +-3.2 (95%) LOS: 90.8%
Total: 14840 W: 2502 L: 2409 D: 9929
[You must be registered and logged in to see this link.]

Include suggestions from Marco Costalba, Aram Tumanian, Ronald de Man, etc.

Bench: 5207156



RFISH gldrnk
Back to top Go down
http://www.realjewnews.com/?p=67
 
SF 9 !! latest version !! Introduce dynamic contempt
Back to top 
Page 1 of 1
 Similar topics
-
» SCID New Version!!
» UCI2WB 1.9 released
» AntiMaster 9X.ctg [NEW]
» WSCE - World Championship Qualifier #1
» Bulgarian Boy Introduce Himself !

Permissions in this forum:You cannot reply to topics in this forum
chessforyou Bettina&Terry77 :: ENGlNES :: ALL ENGlNES :: Stockfish :: StockFish Forks-
Jump to: