v7.0

Release notes

This version of Sirius is, unfortunately, no longer using just piece square tables for the evaluation function. It is, however, significantly stronger than Sirius 6.0 in self-play. Major new features include a more sophisticated handcrafted evaluation function tuned with my tuner, and a few major search features

Changelog

• A few minor refactors
• Many new evaluation features
  • Mobility
  • Threats
  • Pawn structure
    • Passed pawns, isolated pawns, etc.
  • King safety
    • Pawn shield/storm
    • Safe checks from enemy pieces
    • Attacks to squares near kings
  • Rooks on open/semi-open files
  • Knight outposts
  • Bishop pair
  • Tempo bonus
• A few search changes
  • Static evaluation correction history
  • Capture history
  • Quiescence search futility pruning
  • Threat history
  • Some other tweaks
• Complete LTC SPSA tune of the entire search

Self-play against Sirius v6.0

Elo   | 269.79 +- 7.38 (95%)
Conf  | 8.0+0.08s Threads=1 Hash=16MB
Games | N: 10000 W: 7189 L: 682 D: 2129
Penta | [29, 163, 708, 1472, 2628]

Elo   | 306.84 +- 10.27 (95%)
Conf  | 40.0+0.40s Threads=1 Hash=64MB
Games | N: 5000 W: 3715 L: 175 D: 1110
Penta | [0, 41, 251, 835, 1373]

Estimated 3200 rating

Credits

Thanks to members in the engine dev community who continue to support me
Special thanks to Andy Grant for creating OpenBench

Selecting a binary

v1 is significantly slower than v2, v3, and v4(about 15x), 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.

Full Changelog: v6.0...v7.0