Little Wing 0.5.0 released

[vincent]

After a few weeks of work and 8 months since the last release of Little Wing, a chess engine written in Rust, the new version 0.5.0 is ready!

Most of the gain in strength (around 40 ELO) comes from a faster move generator implementing hyperbola quintessence. But the two most important features are Android support and an improved command line interface (CLI).

Changelog

Added

• Use Hyperbola Quintessence and First Rank Attacks for sliding piece attacks
• Use Xorshift random number generator for Zobrist hashing
• Add depth parameter to perft CLI command
• Add save fen and save pgn CLI commands
• Add --silent flag to executable

Changed

• Improve CLI output
• Rename load CLI command to load fen
• Rename Direction to Shift and introduce a new (compass) Direction
• Rename Move* to PieceMove*
• Store castling rights in a u8 in Position
• Use fail-soft instead of fail-hard in search
• Refactor many parts of the code

Tournament results

Here are the latest results of gauntlet tournaments with 40 moves in 60+0.6 seconds:

Code: Select all

Rank Name                         Elo    +    - games score oppo. draws
   1 Dorpsgek Dillinger 1        2244   13   13  2695   72%  2061   12% 
   2 RattateChess 1.0 Nosferatu  2200   12   12  2694   67%  2061   11% 
   3 Napoleon                    2101   12   12  2695   55%  2061   20% 
   4 Little Wing v0.5.0          2077    6    6 10548   54%  2044   14% 
   5 Cinnamon 2.0                2040   12   12  2690   47%  2061   18% 
   6 Little Wing v0.4.0          2033    8    8  6820   48%  2045   15% 
   7 Poor little Pinkus          1984   12   12  2693   40%  2061   13% 
   8 Sjaak II 1.4.1              1934   12   12  2694   34%  2061   16% 
   9 Sayuri 2018.05.23           1803   14   14  2695   20%  2061   10% 

And with 40 moves in 10+0.1 seconds:

Code: Select all

Rank Name                         Elo    +    - games score oppo. draws
   1 Dorpsgek Dillinger 1        2293    4    4 32751   75%  2086   11% 
   2 RattateChess 1.0 Nosferatu  2200    4    4 32747   64%  2086   11% 
   3 Napoleon                    2118    3    3 32747   54%  2086   17% 
   4 Little Wing v0.5.0          2096    3    3 49716   52%  2078   12% 
   5 Little Wing v0.4.0          2048    4    4 27439   46%  2078   13% 
   6 Sjaak II 1.4.1              1950    4    4 32738   33%  2086   13% 
   7 Sayuri 2018.05.23           1832    4    4 32743   21%  2086    9%

Links

https://github.com/vinc/littlewing
https://vinc.cc/blog/2018/07/18/little- ... 0-released
https://vinc.cc/binaries/littlewing-v0.5.0

[vincent]

Thanks Vincent. These are very good news. I'm going to test the new Little Wing as soon as possible.

Great! Can't wait to see how it'll perform on CCRL!

[melajara]

Nice to have a Rust engine, keep up the good work