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» Guzelkiz.bin II (powerofsouthsumatera)
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyToday at 4:36 am by "B"

» Eman 3.72 +
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptySat Jun 22, 2019 6:36 pm by vv56

» McCain X4 Release Final
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptySat Jun 22, 2019 5:28 am by When D Green ?

»  Stockfish Polyglot: Updated June, 21st 2019
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyFri Jun 21, 2019 11:33 am by When D Green ?

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  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyFri Jun 21, 2019 11:15 am by LondonFrau

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  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyFri Jun 21, 2019 1:43 am by "B"

»  SugaR-NN 1.0 32-64 by Zerbinati Jun 18, 2019
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyWed Jun 19, 2019 11:57 pm by Doppelganger

» Cerebellum Stockfish June 10th 2019
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyWed Jun 19, 2019 11:26 am by "B"

»  BrainFish June 16th 2019
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyWed Jun 19, 2019 11:22 am by "B"

Latest topics
» Guzelkiz.bin II (powerofsouthsumatera)
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyToday at 4:36 am by "B"

» Eman 3.72 +
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptySat Jun 22, 2019 6:36 pm by vv56

» McCain X4 Release Final
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptySat Jun 22, 2019 5:28 am by When D Green ?

»  Stockfish Polyglot: Updated June, 21st 2019
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyFri Jun 21, 2019 11:33 am by When D Green ?

» Latest abrok Development Versions June 21st
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyFri Jun 21, 2019 11:15 am by LondonFrau

» Latest abrok Development Versions June 20 th
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyFri Jun 21, 2019 1:43 am by "B"

»  SugaR-NN 1.0 32-64 by Zerbinati Jun 18, 2019
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyWed Jun 19, 2019 11:57 pm by Doppelganger

» Cerebellum Stockfish June 10th 2019
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyWed Jun 19, 2019 11:26 am by "B"

»  BrainFish June 16th 2019
  SF 9   !! latest version !!  Introduce dynamic contempt  EmptyWed Jun 19, 2019 11:22 am by "B"

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  SF 9 !! latest version !! Introduce dynamic contempt

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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



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