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Commits on Apr 17, 2025

• Increased version number and upgraded to .net9 framework

  

  thomas.jahn

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• fixed https://github.com/lithander/MinimalChessEngine/issues/5

  

  thomas.jahn

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Commits on Feb 8, 2024

• Update README.md

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Commits on Mar 9, 2022

• Update README.md

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Commits on Jan 26, 2022

• Some semanticly equivalent refactorings

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Commits on Jan 15, 2022

• upgraded wac to use the revised wac with 300 positions from https://arasanchess.org/tests.zip

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• changed default target framework to net6

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Commits on Sep 25, 2021

• Update README.md

  lithander

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Commits on Sep 21, 2021

• Update README.md

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Commits on Sep 12, 2021

• Update README.md

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• Update README.md

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Commits on Sep 10, 2021

• Update README.md

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Commits on Sep 6, 2021

• Version 0.6.1 improves mate finding capabilities: Now encoding the mate distance into the checkmate score instead of counting moves in the PV. Shortest mates are preferred over late ones by search.…

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Commits on Aug 29, 2021

• Merge branch 'master' of https://github.com/lithander/MinimalChessEngine

  lithander

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• Version 0.6 release

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• Update README.md

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• when reporting the 'info' to the GUI and the PV contains less then 'depth' moves due to a TT hit the engine now tries to restore the rest of the PV from the TT.

  lithander

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Commits on Aug 28, 2021

• Did a little code review and cleaned up and fixed a few things here and there. Nothing major.

  lithander

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• MoveList now stores SortedMove instead of Move: a struct that stores a move together with a priority. This eliminates the cost of repeatedly computing MvvLva or history values for moves while sorti…

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Commits on Aug 27, 2021

• Late moves are now reduced by 2 instead of 1.

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Commits on Aug 23, 2021

• History.cs refactored. It's not a static class anymore, instead IterativeSearch has an instance and passes it to the playmaker just like killers. Only beta cutoffs are stored as "good" positions in…

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Commits on Aug 20, 2021

• Added history heuristic and a simple late move reduction. Many variants are possible. Currently any move that raises alpha (and not only beta cutoffs) are remembered as good moves and the reduction…

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Commits on Aug 18, 2021

• another small refactoring that does not affect search behavior but improves the speed, reduces LOC by 2 instructions and is easier to read

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• small refactoring, -2 LOC, same speed, easier on the eye

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Commits on Aug 12, 2021

• The board now knows its evaluation and updates it incrementally. Only This is cheaper than recomputing the positional score from scratch whenever needed. It doesn't change the search except making …

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• Added futility pruning to search for the last 4 plies. If eval(child) + margin < alpha then the child is skipped. Worth about 30 ELO. Version bumped to 0.5.8.

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Commits on Jul 20, 2021

• Upgraded the TT to use a 2-bucket system with a replacement scheme based on depth and age. In a test against the previous version (0.5.4) with 10MB Hash and 5s + 0.5s time control this was worth 20…

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Commits on Jul 15, 2021

• Transpositions simplified to use an always-replace scheme. No buckets and no deletion of "chunks" necessary to prevent accumulation of stale entries. 656 LOC. A decent choice for a minimal engine!

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Commits on Jul 14, 2021

• Search now gathers the PV. No TriangularTable necessary anymore.

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Commits on Jul 11, 2021

• Merge branch 'master' of https://github.com/lithander/MinimalChessEngine

  lithander

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• Extracting PV from the TT was too error prone. Going back to using a simplified TriangularTable for now but keeping the improved 2-slots TT.

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Commits on Jul 8, 2021

• removed logging of debug metrics, reintroduced try-catch

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• Added ClearChunk to TT that allows to delete a rolling sub-sectin of the TT.

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Commits on Jul 5, 2021

• Added a 2-bucket TT that supports extraction of the PV which allows me to get rid of the PrincipalVariation class entirely.

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Commits on Jul 3, 2021

• Removed playing moves from the PV directly. Instead the PV of the last iteration is now stored again in the hash before going into SearchDeeper to make sure it's available from the TT. Less code an…

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