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Ethereal8.00

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@AndyGrant AndyGrant released this 08 Jan 11:43
V8.00
b676adc

Official release of Ethereal8.00.

Summary of the changes made.

  • Cleaned up a large portion of the source code, removal of magic numbers + more
  • Resolved an issue which could cause problems with repeating time controls
  • Fixed an issue where not all squares could be connected (Thanks, Fernandotenorio)
  • Fixed an asymmetry issue with pawn connect evaluation (Thanks, Fernandotenorio)
  • Added Queen mobility into the evaluation function
  • Pawns can now be both stacked and isolated
  • Apply LMR to PV nodes but at a reduced depth
  • Factoring in pawns into attackerCounts and attackCounts
  • Lowered the threshold of attackers for the safety table
  • Greatly simplified the evaluation function, and merged most code together
  • Began saving passed pawn locations into the Pawn Structure transposition table
  • With that addition, we are now able to score passed pawns based on other features on the board
  • Extended a max depth limit from 32 to 64.
  • Factoring in all 'standard' terms into the zorbist hash
  • Fixed an issue where castle moves were generated when there were none
  • Cleaned up some code involving making null moves
  • Simplified the transposition table now that turn is factored into the zorbist key
  • Finally removed the damned -MATE scores
  • Finally created a nice testing framework, EtherealBenchmarking

A big thanks to all of those who have helped with the recent changes. Especially the members of TalkChess who were so helpful when diagnosing some issues involving zorbist keys.

Thanks as always,
Andrew Grant

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