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Amoeba search ofSimionescu function^[1]

Amoeba,
anUCI compliantopen source chess engine byRichard Delorme, written in theD programming language, first released in May 2016^[2], licensed under theGPL v3.0. Amoeba uses theNelder–Mead method^[3] or downhill simplex method^[4] totune itsevaluation parameters, also calledamoeba method and eponym of the program^[5].

Features

^[6]

Board Representation

• Bitboards
• Hyperbola Quintessence andRank Attacks
• Mailbox
• Staged Move Generation

Search

• Iterative Deepening
• Aspiration Windows (improved in 2.6)
• Principal Variation Search
• Transposition Table (improved in 2.6)
• Check Extensions
• Null Move Pruning
• Reverse Futility Pruning
• Razoring
• Mate Distance Pruning
• Late Move Reductions (improved in 2.6)
• Quiescence Search
• Internal Iterative Deepening
• Static Exchange Evaluation (SEE pruning improved in 2.6)

Evaluation

• Tapered Eval
• Lazy Evaluation
• Mobility
• Pawn Structure
• Tempo
• Automated Tuning usingNelder–Mead method aka Amoeba method

Tournament Manager

With the release of Amoeba2.1, the code of a tournament manager was published also written inD language, used to validate or reject Amoeba changes^[7]. So far only with fixed time per move, it

• can use variousopenings frompgn file
• can play several games in parallel
• can set H0 & H1hypothesis forSPRT^[8]
• can saves played game to a pgn file

See also

• Dumb

Forum Posts

2016 ...

• amoeba a new UCI engine byRichard Delorme,CCC, May 20, 2016
• Amoeba 1.3 released byRichard Delorme,CCC, August 03, 2016
• Amoeba 2.0 byRichard Delorme,CCC, November 27, 2016
• amoeba 2.1 byRichard Delorme,CCC, January 24, 2017
• sprt tourney manager byRichard Delorme,CCC, January 24, 2017 »Amoeba Tournament Manager,SPRT
• amoeba 2.2 released byGünther Simon,CCC, March 03, 2017
• Amoeba 2.4 byRichard Delorme,CCC, April 19, 2017
• Amoeba 2.5 byRichard Delorme,CCC, June 07, 2017
• Amoeba 2.6 byRichard Delorme,CCC, September 22, 2017
• Amoeba 2.7 byRichard Delorme,CCC, December 11, 2017
• Amoeba 2.8 byRichard Delorme,CCC, March 18, 2018
• Re: New engine releases 2019 (Amoeba 3.0) byRichard Delorme,CCC, March 28, 2019

2020 ...

• Re: New engine releases 2020 (Amoeba 3.1) byRichard Delorme,CCC, January 16, 2020
• Re: New engine releases 2020 (Amoeba 3.2) byRichard Delorme,CCC, July 25, 2020
• Re: New engine releases & news 2021 (Amoeba 3.3) byRichard Delorme,CCC, March 14, 2021
• Re: New engine releases & news 2021 (Amoeba 3.4) byRichard Delorme,CCC, December 16, 2021

External Links

Chess Engine

• GitHub - abulmo/amoeba: an UCI chess engine in d language
• Amoeba inCCRL 40/40

Misc

• Amoeba from Wikipedia
• amoeba - Wiktionary
• Amoeba (genus) from Wikipedia
• Amoeba (disambiguation) from Wikipedia
• Amoeba (mathematics) from Wikipedia

References

Up one Level

• UCI
• D-Proglanguage
• Open Source
• GPL