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Caipora 3.6

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@ComputecOrg ComputecOrg released this 01 Oct 14:18
· 44 commits to main since this release
v3.6
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Learn about vigilant mode.

Caipora 3.6 is the first public release of Caipora, an original UCI chess engine from Brazil,
written from scratch in Rust with its own NNUE.

Strength

  • Gauntlet at 8+0.08, 1 thread, 300 games per opponent, against Stash versions with known CCRL
    Blitz ratings: ~3508 ± 23 CCRL Blitz estimated (Stash 33: 80.2%, Stash 37: 62.0%, all
    600 games ended normally). This is our own estimate, not an official CCRL rating.
  • Lichess: caiporaBot, blitz 2854 on 1 October 2026.

Downloads

File For
caipora-3.6-windows-x86-64-v3.exe Windows, CPUs with AVX2 (Intel Haswell 2013+, AMD Zen / Excavator+). Fastest.
caipora-3.6-windows-x86-64.exe Windows, any x86-64 CPU (about 20% slower)
caipora-3.6-linux-x86-64-v3 Linux, AVX2, static binary
caipora-3.6-linux-x86-64 Linux, any x86-64 CPU, static binary

The network is embedded; no extra files are needed. Bench: 5108549 for every build
(caipora bench). Checksums in SHA256SUMS.txt.

What is new since the first versions

  • NNUE g6: (768×8 king buckets → 1024)×2 → 8 output buckets, SCReLU, trained with bullet on
    Leela Chess Zero data (ODbL).
  • Search: PVS, aspiration windows, singular extensions with multi-cut, null move, LMR, LMP,
    futility, SEE pruning, quiescence with TT, butterfly, continuation and correction histories,
    Lazy SMP.
  • Time management scaled by best-move stability; pondering.
  • Standard chess and Chess960 / DFRC.

UCI options

Hash (16 MB), Threads (1, up to 256), Move Overhead (10 ms), Ponder, UCI_Chess960,
EvalFile (<embedded>), Clear Hash.

AI usage

Caipora is written by Claude Code (Anthropic) under the direction, review and testing of its
author; every commit is co-authored by Claude. No code, constants or networks from other engines
are used. Full policy: AI_USAGE.md.

License: GPL-3.0-or-later.

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