New chess engine: Sirius 6.0

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New chess engine: Sirius 6.0

Sirius 5.0 - UCI chess engine

Rating CEDR=2746

v.6.0:

Changelog

Lots of refactors

Lots of fixes

Much better time management

soft time management

node count time management

A new set of piece square tables

Improvements to various pruning techniques

The improving heuristic

reverse futility pruning

late move pruning

late move reductions

Better history implementation

continuation history

3 fold pvs/lmr

Lots of performance improvements

pseudo legal movegen

Better tt lookup

Added history pruning

Added internal iterative reductions

Adjust static evaluation using the tt score

Lazy SMP

Other tweaks and improvements

Full changelog: v5.0...v6.0

Release Notes

This is the final version where Sirius is piece-square table only. This release brings many improvements to the search, a completely new set of piece square tables, and tons of bug fixes and performance improvements. Sirius-v6.0 is around ~370 elo stronger than the previous version in self-play, and is an estimated ~3050 elo.

Self-play against sirius-v5.0

Score of sirius-6.0 vs sirius-5.0: 3293 - 101 - 641 [0.896] 4035

... sirius-6.0 playing White: 1693 - 39 - 286 [0.910] 2018

... sirius-6.0 playing Black: 1600 - 62 - 355 [0.881] 2017

... White vs Black: 1755 - 1639 - 641 [0.514] 4035

Elo difference: 373.3 +/- 13.3, LOS: 100.0 %, DrawRatio: 15.9 %

tc: 8+0.08

Score of sirius-6.0 vs sirius-5.0: 1397 - 28 - 325 [0.891] 1750

... sirius-6.0 playing White: 746 - 8 - 121 [0.922] 875

... sirius-6.0 playing Black: 651 - 20 - 204 [0.861] 875

... White vs Black: 766 - 659 - 325 [0.531] 1750

Elo difference: 365.2 +/- 18.9, LOS: 100.0 %, DrawRatio: 18.6 %

tc: 8+0.08s

Against PeSTO

Comparison against PeSTO, the current(previous?) strongest pst-only engine

Score of sirius-6.0 vs PeSTO: 784 - 629 - 1347 [0.528] 2760

... sirius-6.0 playing White: 410 - 290 - 680 [0.543] 1380

... sirius-6.0 playing Black: 374 - 339 - 667 [0.513] 1380

... White vs Black: 749 - 664 - 1347 [0.515] 2760

Elo difference: 19.5 +/- 9.3, LOS: 100.0 %, DrawRatio: 48.8 %

tc: 20+0.2

Credits

Huge thanks to Ciekce, JW, Alex2262, and Cj5716 along with many others in the engine dev community, who have continued to provide valuable support and insight on the development of Sirius

Selecting a binary

v1 is significantly slower than v2, v3, and v4(about 3x), and should only be used when absolutely necessary. In general, higher levels are faster.

If you download a binary and it crashes(closes immediately or doesn't respond to commands), it likely doesn't work, and you should download a different binary.

Sirius 6.0 download

Comments

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