Sapeli 1.0 - New chess engine

[JohnWoe]

Sapeli 1.63

Source code: https://github.com/SamuraiDangyo/Sapeli
Release: https://github.com/SamuraiDangyo/Sapeli ... /tag/v1.63

There was actually some bugs in perft function. The total perft suite is actually: 32,362,126,796 nodes.
Time management is greatly simplified.
AiLevel was much improved.

Now AiLevel is much better. Some quick tests.
AiLevel 0 as random mover loses all games as random mover should.
Level 1/100 scores 2%.
10/100 scores 9%. etc.
Seems to work great now.

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AiLevel: 0
Score of Sapeli 1.63 vs Fairy-Max 5.0b: 0 - 276 - 0  [0.000] 276

AiLevel: 1
Score of Sapeli 1.63 vs Fairy-Max 5.0b: 2 - 139 - 4  [0.028] 145

AiLevel: 10
Score of Sapeli 1.63 vs Fairy-Max 5.0b: 24 - 326 - 20  [0.092] 370

AiLevel: 30
Score of Sapeli 1.63 vs Fairy-Max 5.0b: 16 - 126 - 17  [0.154] 159

AiLevel: 50
Score of Sapeli 1.63 vs Fairy-Max 5.0b: 46 - 112 - 21  [0.316] 179

AiLevel: 80
Score of Sapeli 1.63 vs Fairy-Max 5.0b: 74 - 39 - 36  [0.617] 149

AiLevel: 100
Score of Sapeli 1.63 vs Fairy-Max 5.0b: 82 - 5 - 17  [0.870] 104

[JohnWoe]

I wanted to check has there been any progress in terms of strength. It is faster and less buggy that's I know without testing.

I ran a little tournaments against older versions using Chess960 games. I test against Stockfish just to see there's no illegal moves/crashes.
Yes, the latest version is the strongest as it should be.

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Rank Name                          Elo     +/-   Games   Score   Draws
   1 Sapeli 1.64                    66      32     400   59.4%   13.3%
   2 Sapeli 1.02                    55      32     400   57.9%   14.2%
   3 Sapeli 1.38                    36      32     400   55.1%   13.3%
   4 Sapeli 1.21                   -61      32     400   41.4%   13.8%
   5 Sapeli 1.16                   -98      33     400   36.3%   12.5%
Finished match

[Gabor Szots]

I wanted to check has there been any progress in terms of strength. It is faster and less buggy that's I know without testing.

I ran a little tournaments against older versions using Chess960 games. I test against Stockfish just to see there's no illegal moves/crashes.
Yes, the latest version is the strongest as it should be.

Code: Select all

Rank Name                          Elo     +/-   Games   Score   Draws
   1 Sapeli 1.64                    66      32     400   59.4%   13.3%
   2 Sapeli 1.02                    55      32     400   57.9%   14.2%
   3 Sapeli 1.38                    36      32     400   55.1%   13.3%
   4 Sapeli 1.21                   -61      32     400   41.4%   13.8%
   5 Sapeli 1.16                   -98      33     400   36.3%   12.5%
Finished match

Still no chance for a Windows compile?

[Guenther]

...
Still no chance for a Windows compile?

I created one for my architecture only, old quadcore (yorkfield), no popcount, SSE 4.1.
If you are interested I can add it here, (if talkchess has no hickups anymore for connection)
(connection problems since around 15 minutes from here)

[Gabor Szots]

...
Still no chance for a Windows compile?

I created one for my architecture only, old quadcore (yorkfield), no popcount, SSE 4.1.
If you are interested I can add it here, (if talkchess has no hickups anymore for connection)
(connection problems since around 15 minutes from here)

Yes, I am interested. And sooner or later I may learn how to compile it myself.

[Guenther]

...
Still no chance for a Windows compile?

I created one for my architecture only, old quadcore (yorkfield), no popcount, SSE 4.1.
If you are interested I can add it here, (if talkchess has no hickups anymore for connection)
(connection problems since around 15 minutes from here)

Yes, I am interested. And sooner or later I may learn how to compile it myself.

Well, the quota for adding files is very low?
(140KB was too much already)

Sorry, the board attachment quota has been reached.

Get it here:
http://rwbc-chess.de/Downloads/Engines/Sapeli_164na.7z

[Gabor Szots]

Get it here:
http://rwbc-chess.de/Downloads/Engines/Sapeli_164na.7z

Thanks Günther.

[Guenther]

Get it here:
http://rwbc-chess.de/Downloads/Engines/Sapeli_164na.7z

Thanks Günther.

Changed the name and thus the download now is called:
http://rwbc-chess.de/Downloads/Engines/Sapeli_164old.7z

[JohnWoe]

^ Thanks Günther! I added your build to the list: https://github.com/SamuraiDangyo/Sapeli ... naries/bin

I released Sapeli 1.65:
Source code: https://github.com/SamuraiDangyo/Sapeli
Release: https://github.com/SamuraiDangyo/Sapeli ... /tag/v1.65

I have those other compilers installed on my laptop so I'll add Android + other builds later.

With this release I profiled and profiled Sapeli. And squeezed every NPS out I could. It is fast.
Some tuning to LMR. Slightly more aggressive pruning. Split search into smaller pieces.
1.65 searches a bit deeper than 1.64. But that wasn't the goal.
Source code polishing.
Strength wise on par with 1.64. Slightly stronger on my tests.

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benchmarks
1.65
= nodes 120041499 mnps 4.001 time 30.000
1.64
= nodes 114280936 mnps 3.808 time 30.010

some tests
Score of Sapeli 1.65 vs Sapeli 1.64: 414 - 393 - 193  [0.510] 1000
Elo difference: 7.30 +/- 19.34
Finished match

[Guenther]

Compiled a few flavours for 1.65, with a big caveat, because I had never built versions before, I cannot run here myself,
which is a bit awkward.

Would be nice if someone could try the bmi or bmi2 version, if those run at all and with what speed.
The other two are are tested here and behave very similar at least on my old machine.

http://rwbc-chess.de/Downloads/Engines/Sapeli_165.7z