Unfragile

KataGo is a strong open-source Go engine trained by self-play 1. Its official page describes a distributed training run and states that support for versions prior to v1.18.0 has been retired 1. The results below are otherwise unrelated general platforms, so no other source offers a direct Go-engine alternative.

1
KataGo Distributed Trainingkatagotraining.orgwebsite read, tools not yet checked
A strong open-source self-play-trained Go engine that predicts score and territory, plays handicap games, and handles many board sizes and rules with one neural net 1.
Website Get started
2
Leela Chess Zerolczero.orgwebsite read, tools not yet checked
An open-source neural network chess engine inspired by AlphaZero, not a Go engine, so it is an alternative only in the sense of a self-play-trained board-game engine 4.
Website Docs
3
Stockfishstockfishchess.orgwebsite read, tools not yet checked
A free, open-source chess engine that analyzes positions and communicates via the UCI protocol, not a Go engine, so it is an alternative only in the sense of a board-game engine 8.
Website

Sources

1KataGo Distributed Trainingkatagotraining.org · read 2026-10-29
4Leela Chess Zerolczero.org · read 2026-10-29
8Stockfish - Strong open-source chess enginestockfishchess.org · read 2026-10-29

Left out: AnotherAI, because each one's own page says it is retired or discontinued.

For agents: the 10 actions behind this answer

· Katagotraining website read, tools not yet checked
sagemaker-ai · sagemaker-ai verified and signed
Build, train, and deploy AI models with deep AWS AI/ML expertise brought directly into your coding assistants, covering the surface area of Amazon SageMaker AI.
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· Lczero website read, tools not yet checked
Open source neural network based chess engine
· Go website read, tools not yet checked
Go is an open source programming language that makes it simple to build secure, scalable systems.
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Ask AI — Send a question or instruction to a Groq model and get a text reply.
gopls-lsp · gopls-lsp verified and signed
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· Stockfishchess website read, tools not yet checked
Strong open-source chess engine
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AI Search
analyze-test-run · analyze-test-run verified and signed
analyze-test-run — an installable skill for AI agents.

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