Chess engine: Renegade 0.10.0

Author:Krisztian Peocz  

Rating CEDR=2319

Renegade is a chess engine written in C++ using Visual Studio 2019. It values readability and simplicity, and uses the UCI protocol to communicate, making it easy to connect it to chess frontends. Under construction since October 7, 2022 and released publicly on January 15, 2023.  

The project can be compiled using Visual Studio 2019 with C++20 features enabled. The engine makes heavy use of `popcnt` and `lzcnt` instructions, thus only processors from 2013 or so are supported, but the calls to these instructions are wrapped in a custom function, and replacing them with something more compatible is relatively straightforward. Currently only Windows binaries are compiled, but in the future I would like to make them for Linux as well.

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v.0.10.0:

Improved evaluation

Tuned most parameters, using 7.1 million positions from the lichess-big3-resolved dataset

Added pawn threats

Separate early and late game penalties for isolated pawns

Passed pawn bonuses depend on the rank

Penalty for a passer that is blocked

Adjusted king safety scores

Changed phase calculations

Reduced the number of expensive linear interpolation calls

Improved search

Enabled late-move reductions

Added reverse futility pruning

Much more aggressive regular futility pruning

Updated null-move pruning formula

Added internal iterative deepening

Move ordering updates

Added history heuristic (albeit with some weird behavior)

Cleaned it up a bit

Added new commands

bench: tests nps on 10 different positions

goall: prints the evaluation of all legal moves (optionally takes a parameter, which is how much time (in milliseconds) should be spent on analyzing a move, defaults to 1 second)

Fixed a bug in the recognition of KBvKB insufficient material draws

Formerly this led to the engine refusing to make moves (returning bestmove 0000)

Rating CEDR=2271 Author - Krisztian Peocz

Individual statistics: Renegade 0.7.0 - 148 games (+ 17,=  5,-126), 13.2%

Critter 1.6a                  :   6 (+  0,=  0,-  6),  0.0 %

Houdini 1.5a                  :   2 (+  0,=  0,-  2),  0.0 %

Delocto 0.61n                 :   1 (+  0,=  0,-  1),  0.0 %

ECE 20.1                      :   2 (+  0,=  0,-  2),  0.0 %

Fritz 17                      :   2 (+  0,=  0,-  2),  0.0 %

Jinx 1.0                      :   1 (+  0,=  0,-  1),  0.0 %

Hiarcs 15.5                   :   2 (+  0,=  0,-  2),  0.0 %

Coiled 1.1                    :   2 (+  0,=  0,-  2),  0.0 %

Fritz 18                      :   2 (+  0,=  0,-  2),  0.0 %

Lc0 0.29.0                    :   2 (+  0,=  0,-  2),  0.0 %

Raven 1.30                    :   2 (+  0,=  0,-  2),  0.0 %

Peacekeeper 1.1               :   3 (+  0,=  0,-  3),  0.0 %

Akimbo 0.1.1                  :   2 (+  0,=  0,-  2),  0.0 %

BlackCore 5.0                 :   4 (+  0,=  0,-  4),  0.0 %

Stockfish 20230114            :   6 (+  0,=  0,-  6),  0.0 %

4ku 1.1                       :   2 (+  2,=  0,-  0), 100.0 %

Igel 3.3.0                    :   8 (+  0,=  0,-  8),  0.0 %

Inanis 1.2.0                  :   8 (+  0,=  2,-  6), 12.5 %

Koivisto 9.0                  :   4 (+  0,=  0,-  4),  0.0 %

Polyfish 230115               :   6 (+  0,=  0,-  6),  0.0 %

Caissa 1.5                    :   8 (+  0,=  0,-  8),  0.0 %

CorChess 20230114             :   2 (+  0,=  0,-  2),  0.0 %

Charisma Saphir               :   6 (+  0,=  0,-  6),  0.0 %

ShashChess 27.2               :   6 (+  0,=  0,-  6),  0.0 %

Koivisto 9.0 Ipman            :   8 (+  0,=  0,-  8),  0.0 %

Frozenight 6.0.0              :  10 (+  0,=  0,- 10),  0.0 %

Jangine 2023-01-15            :   8 (+  4,=  2,-  2), 62.5 %

Mess 0.0.2                    :   7 (+  2,=  0,-  5), 28.6 %

Clovis II                     :   4 (+  0,=  0,-  4),  0.0 %

Durandal 0.1.1                :   3 (+  3,=  0,-  0), 100.0 %

Princhess 0.9.0               :   5 (+  1,=  1,-  3), 30.0 %

Wasabi 1.5.0                  :   2 (+  0,=  0,-  2),  0.0 %

Sturddle 1.27                 :   4 (+  0,=  0,-  4),  0.0 %

Zagreus 2.0.0 alpha-2         :   4 (+  4,=  0,-  0), 100.0 %

Durandal 0.1.2                :   1 (+  1,=  0,-  0), 100.0 %

Sting Black Hole 4            :   2 (+  0,=  0,-  2),  0.0 %

Rapcschess 2022-12-08         :   1 (+  0,=  0,-  1),  0.0 %

Renegade 0.10.0 download

github:https://github.com/pkrisz99/Renegade/releases/tag/v0.10.0