Simple Chess 3.5.0 JA - new version chess engine

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SimpleChessEngine - UCI engine
Author: LinkLikesLattes  Rating Chess Engines Diary CEDR=3696

SCE is a chess engine written in educational purposes. Its rating is aproximatly 1690 - 1750 elo. SCE won shallow blue and tscp It uses UCI protocol to communicate with GUI interface. It was not tested on linux!

What's new?
SimpleChess 3.7.0
Comparison (10+0.1, pentanomial SPRT) Elo (95%)
Network only: SCNNUEv3-2026-11-04 vs SCNNUEv3-2026-10-15, both on the 3.7.0 engine +35 [+26, +45]
Code + network: 3.7.0 vs the 3.6.0 release +38 [+28, +48]
3.7.0 vs the 3.5.0 release +111 [+93, +129]
3.5.0 is the point of comparison because it is the latest release with a CCRL rating: 3485 on CCRL 40/15 (one CPU).

New network SCNNUEv3-2026-11-04. Same architecture; the training set adds four generations of self-play (2.61 billion), among them positions from a reverse analysis of the engine's own games, with the oldest 1.5 billion positions dropped, for a new training set of 4.29 billion positions (3.18 billion before).
Faster. Network evaluations are cached per search thread, and on x86-64 the accumulator is updated lazily: the same search runs about +5% nodes per second on Apple Silicon and +27% on x86-64 AVX2 (+39% at eight threads). No node count changes, so on the same network 3.7.0 plays exactly as 3.6.0, only sooner.
Win/draw/loss model re-fitted for the new network (behind UCI_ShowWDL and the normalized cp), on 1.05 billion self-play positions. Full list in the changelog.
Downloads (each zip holds the engine, LICENSE, NOTICE and install notes):

simplechess-3.7.0-windows-avx2.zip — Windows x86-64, AVX2 (Intel Haswell / AMD Zen or newer); keep the network file beside the exe.
simplechess-3.7.0-macos-arm64.zip — macOS on Apple Silicon (M1 or newer), macOS 11+; keep the network file beside the binary.
simplechess-3.7.0-android-arm64.zip — Android, phone SoCs from about 2018 on (Arm dot-product); network embedded.
simplechess-3.7.0-android-arm64-generic.zip — Android, older 64-bit SoCs without dot-product; network embedded, slower.
To build from source: make (or make profile-build PGO_NET=nets/SCNNUEv3-2026-11-04.scn5 for the fastest binary); the network ships in the repository. Third-party notices are in NOTICE.

Jim Ablett compiles:

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