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New version chess engine: Tcheran 2.4

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Tcheran - UCI chess engine  Author: Jonathan Gilchrist
Rating Chess Engines Diary CEDR=2245

v.2.4:
Expand move scoring range from 200000 to 1000000000 (~10 Elo)
Refactor duplicate code in MoveProvider (~9 Elo)
Score quiets after yielding killers and avoid scoring captures with killer scores (~7 Elo)
Persist and decay history heuristic data (~6 Elo)
Do null move pruning when static eval == beta (~5 Elo)
Avoid yielding the prior best move from the transposition table twice (~2 Elo)
Killer move fixes: bound history scores and don't allow dupes (~0 Elo)
Misc
Added a 'Threads' UCI option (which isn't used)
Changed various Cargo options
Disable incremental compilation in release mode
Switch to panic=abort
Stop generating debug symbols
Set codegen-units=1
Report 'uci name' as 'name version' instead of 'name (version)'


Tcheran 2.3 - results:
Alouette 0.1.76/6+66 Games
Piglet 1.3.64/4+44 Games
GitChess 1.04/4+44 Games
Sloth 1.83.5/4+34 Games
Oxidation 0.7.03.5/4+34 Games
Akira CE 1.1.13.5/4+34 Games
Eubos 3.52.5/4+14 Games
Mayhem 8.22.5/4+14 Games
OpenTal 1.1 JA2/4+04 Games
Fatalii 0.7.01.5/4-14 Games
Rodent NN JA0.5/4-34 Games
Chess-Rikus 1.466 JA2/2+22 Games
Javelin 1.0.02/2+22 Games
Topas 1.3.32/2+22 Games
Alibaba 1.40 JA2/2+22 Games
Throttle 3.21.5/2+12 Games
Peripheral 1.1.31.5/2+12 Games
Jackychess 24.041/2+02 Games
Weiawaga 5.0.00.5/2-12 Games
Arcanum 2.10/2-22 Games
Critter 1.6a0/2-22 Games

 


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