@cimarronOST cimarronOST released this Nov 6, 2018

Assets 9


I'm very proud to finally release Monolith 1.0 after almost 2 years of delights and frustration.
The engine is certainly nothing ground breaking but simply a plain old alpha-beta-searcher like hundreds of its kind, but writing it has enriched those past 2 years immensely. To every non-programmer out there:
If you want to broaden your horizon and learn a programming language, there's no better way to get started than to write a chess engine. Yes, it demands a great lot of time, but I regret no single hour of it.

Main changes are:

  • added support for multi-processors with simplified-ABDADA
  • added support for syzygy endgame-tablebases
  • added support for PEXT instruction
  • added new search enhancements (SEE pruning, singular extension, LMR, aspiration window)
  • added new evaluation terms
  • tuned the evaluation automatically with Texel's tuning method
  • simplified the code
  • fixed a bug that caused crashes while moving backwards through the game

Strength estimate (bullet games):
Score of Monolith 1.0 vs Monolith 0.4: 6481 - 1470 - 2049 [0.751] 10000
Elo difference: 191.36 +/- 6.70

Oct 18, 2018
Merge pull request #8 from cimarronOST/Syzygy-bug-fix
Syzygy bug fix
Oct 18, 2018


Merge pull request #7 from cimarronOST/v1.0
Update source to Monolith 1.0

@cimarronOST cimarronOST released this Mar 18, 2018 · 59 commits to master since this release

Assets 9

monolith 0 4

Main changes are:

  • added support for Fischer Random Chess
  • added support for the UCI 'MultiPV' option
  • added pawn hash table
  • added check- and evasion-generation in quiescence search
  • improved Null Move pruning
  • added Internal Iterative Deepening
  • added Late Move Pruning
  • huge number of other small additions, improvements and bug-fixes

@cimarronOST cimarronOST released this Sep 22, 2017 · 81 commits to master since this release

Assets 8


Main changes are:

  • added Principal Variation Search
  • added reverse futility pruning
  • added SEE for move-ordering
  • added SEE pruning in quiescence search
  • new and improved search extensions
  • higher rook-on-open-file bonus
  • a lot of small evaluation tweaks
  • transposition table improvements
  • new staged and pseudolegal move generator (sadly a Elo loss)
  • completely rewritten UCI handling
  • added new important UCI options
  • fixed the reported bug that prevented the use of external opening books
  • added support to use internal books under Linux
  • a lot of other bug fixes and improvements

@cimarronOST cimarronOST released this May 25, 2017 · 132 commits to master since this release

Assets 7

monolith 0 2
Main changes are:

  • completely rewritten move-ordering
    • added MVV-LVA
    • added Killer Heuristic
    • added History Heuristic
  • completely rewritten evaluation
    • added mobility score, passed pawn bonus, king safety, tempo bonus, bishop pair bonus, knights-connected bonus, rook on (semi)open file bonus
  • many search tweaks
  • heavy hash-table bug fix and a lot of other bug fixes