CCRL Discussion Board

v4.1, July 2024 King safety and mobility evaluation modifications Quiescence search when in check modifications Better play in finals with pawns and 1 piece on each side Pondering is always off for the moment. the code needs an update In my testing Knightx 4.1 is about 50 Elo stronger than v4.0. htt...

Knightx v4.0, May 2024 King safety and mobility evaluation improvement Tree searching parameters adjustment Displays the principal variation as soon as a better move has been found (fail high move) According to my test gauntlet it is about 70 elo stronger than the previous version. Christophe http:/...

v3.9, December 2023 Fixed a limitation in the loading of a FEN position. The engine couldn't always set a position containing doubled pawns Doesn't stop the search when a mate has been found New search function at the root position Tree searching parameters adjustment Positional evaluation parameter...

Ray wrote: ↑Sat Jul 08, 2023 6:37 pm Is that 136 games ? If so, error margins are probably not far off +/- 50 Elo.

Bayeselo gives +/- 45 Elo. There is a progress.

Hello,

A new version of KnightX is available at http://technochess.free.fr

Regression tests vs 3.7b (136 games): +51 Elo

Christophe

v3.7b, March 2023
Regression tests vs 3.6a (79 games 1mn+1s): +60 Elo

http://technochess.free.fr

v3.6a, December 2022 +109 elo vs knightx 3.5 Bug fixes in the capture search transposition table, the root search, the null move pruning conditions Passed pawns evaluation, King safety evaluation for uncastled king The Windows executable is now compiled with the Mingw-w64 Linux cross compiler The 3....

Knightx v3.5, September 2022
+36 elo points (+/- 73)

http://technochess.free.fr

Knightx v3.4, July 2022

+40 elo points (estimated, 60 games in 2mn+1s)

http://technochess.free.fr

Knightx v3.3, June 2022
+70 elo points

http://technochess.free.fr

v3.2, February 2022
Tree searching improvements
Positional evaluation improvements
Tuned search parameters and eval parameters
+40 elo points (game in 2mn+1s)

http://technochess.free.fr

v3.1, November 2021
Positional evaluation improvements in rooks endings, knights endings
Increased search selectivity, modified evaluation of backward pawns
Optimisation of the evaluation, better search speed
Tuned search parameters and eval parameters

http://technochess.free.fr

v3, October 2021
Tree searching improvements
Positional evaluation improvements

http://technochess.free.fr

I will work on it at least until it reaches the 2700 elo.
I wonder what is the ceiling (highest elo today) for a no bitboard, no neural network, single thread program?

v2.91, September 2021
Fixed two regressions in v2.9
Positional evaluation improvement
Tuned search parameters and eval parameters

http://technochess.free.fr

This release has a nasty bug that make it loose many games.
I will release a fix soon.

v2.9, August 2021
Tree searching improvements
Positional evaluation improvements
50 elo points improvement (more or less)

http://technochess.free.fr