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Latest topics
» SPCC: Testrun of BrainFish-2 190310
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyToday at 6:31 am by "B"

» Play chess games 2019
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyYesterday at 7:11 pm by naahi

» Infinity Chess Tour Games 2019 + updates
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyYesterday at 6:54 pm by naahi

» Scorpio ctg
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyThu Apr 18, 2019 5:22 pm by When D Green ?

» Latest Stockfish development builds compiled by I. Ivec . April 16th
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyThu Apr 18, 2019 11:07 am by LondonFrau

» Latest abrok Development Versions April 17th
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyThu Apr 18, 2019 10:41 am by LondonFrau

» Latest abrok Development Versions April 16th
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyWed Apr 17, 2019 4:31 pm by LondonFrau

» ChessOk MegaData 2019
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyTue Apr 16, 2019 10:46 pm by naahi

» Chess for Android: version 6.1.1
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyTue Apr 16, 2019 8:58 am by When D Green ?

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  SF 9 !! latest version !! Introduce dynamic contempt

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When D Green ?
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When D Green ?

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

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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
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LTC:
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 16470 W: 2896 L: 2705 D: 10869
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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
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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
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Include suggestions from Marco Costalba, Aram Tumanian, Ronald de Man, etc.

Bench: 5207156



RFISH gldrnk
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