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Crafty 25.2.1 (UCI)

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@stevemaughan stevemaughan released this 20 Jun 04:14
· 6 commits to master since this release
v25.2.1
7902992

First UCI-capable release of Crafty — the classic engine by Dr. Robert Hyatt, now usable directly in modern GUIs (Arena, Cute Chess, Nibbler, BanksiaGUI, ChessBase, …) alongside its original WinBoard/xboard and native console interfaces (auto-detected from the first command).

Downloads — pick by your CPU

File Tier Requires
crafty-25.2.1-win-x86-64-v3.exe Cutting-edge (fastest) AVX2 / BMI2 — Intel Haswell (2013+) / AMD Zen
crafty-25.2.1-win-x86-64-v2.exe In-between SSE4.2 / popcnt (2008+)
crafty-25.2.1-win-x86-64.exe Basic / max compatibility any 64-bit x86 CPU

All are 64-bit Windows builds compiled with -O3 + profile-guided optimization (PGO), with Syzygy tablebase support and multi-threading (up to 64 threads). If unsure, try v3 first; if it won't launch, fall back to v2, then the basic build.

Additional builds — Windows, Linux & Android (by Jim Ablett)

Highly-optimized Windows, Linux, and Android binaries kindly contributed by Jim Ablett. These are marked _ja_ in the filename, and the engine reports its id as Crafty 25.2.1 JA:

  • Windows (64-bit): crafty_2521_64_ja_avx512, …_avx2_zen2, …_avx, …_sse4, …_sse3_nopop (no-popcnt fallback)
  • Linux (64-bit): crafty_2521_64_ja_avx512_linux, …_avx2_zen2_linux, …_avx_linux, …_sse4_linux
  • Android: crafty_2521_ja_aarch64, …_aarch64_dotprod (64-bit ARM), …_armv7a (32-bit ARM)

Pick the highest instruction-set tier your CPU supports, and drop down a tier if a binary won't launch. The Android builds are confirmed working in Droidfish and Chess for Android.

Many thanks to Jim Ablett for contributing these Windows, Linux, and Android builds.

Highlights

  • Full UCI protocol: position, go (depth / movetime / clock / infinite / ponder), stop, ponderhit, streaming info (incl. seldepth and currmove/currmovenumber), bestmove, and options: Hash, Threads, Ponder, SyzygyPath, OwnBook/BookFile, Move Overhead.
  • Clean info output: one PV line per depth (no duplicate end-of-iteration copy).
  • UCI time-management & robustness fixes: correct ponder default, 50-move tracking from a FEN, well-behaved go infinite/ponder bestmove timing, and a volatile cross-thread stop flag.
  • WinBoard/xboard and native console interfaces unchanged.

Notes

  • Crafty is © Robert M. Hyatt — free for personal use (see README and the source header); not OSI-licensed.
  • 32-bit x86 build not included (Jim Ablett's armv7a covers 32-bit ARM).
  • Reproducible from source via scripts/build-releases.sh.
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