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FunComp 1.0

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@Moxnar Moxnar released this 28 Sep 15:26
· 3 commits to main since this release
v1.0
c77b092

Changelog

FunComp 1.0 (2026-09-28)

The first public release: a classical engine (PeSTO's tables and a modern
alpha-beta search), single-threaded.

Strength. About 3030 on the CCRL Blitz scale: 3031 ± 14 from a
gauntlet of 2,040 games at 10+0.1 against 17 rated engines from eight
families (Stash, Booot, Reckless, Akimbo, RubiChess, Seer, Igel, Clover;
CCRL Blitz 2933-3345). An estimate on our hardware, not an official CCRL
rating.

Binaries.

  • funcomp-1.0-x86-64-v3.exe: for CPUs with AVX2 and BMI2 (Intel
    Haswell, AMD Zen and later). The faster build.
  • funcomp-1.0-x86-64.exe: for any 64-bit x86 CPU.

Both search identically (bench 2780319 nodes) and are statically linked.

UCI options. Hash (MB, default 64), Move Overhead (ms, default 30).

What went into it. Every search feature was tested by SPRT
against the previous best build before it was kept. Since the
last internal milestone, accepted: double and negative singular
extensions, a flag for positions on principal variations, late move
reductions in fractions of a ply, ProbCut, history pruning, a limit
on quiet evasions in quiescence, correction history by non-pawn
material, fifty-move scaling, and detection of repetitions one move
away. Together these gained +61 ± 15 Elo against that milestone in
1,000 balanced games. Tested ideas that didn't pay remain in the code,
switched off, for the tuning pass of 2.0.

Checked before release.

  • A stress run of 8,000 games on both builds (bullet and 40 moves in
    10 s, 24 at a time): no time losses, crashes, disconnects or illegal
    moves.
  • A robustness pass on the protocol: negative clocks from the GUI, a
    clock with no time left, FENs without move counters, invalid FENs.
  • An originality review: FunComp's code is its own. Stockfish and the
    chess-programming community influenced its ideas (see the README's
    credits); a best-move similarity test puts FunComp no closer to
    Stockfish than unrelated engines are to each other.

Known limitations.

  • Single-threaded (no Threads option); no endgame tablebases; no
    Chess960.
  • At bullet speeds (about 5 ms a move) a winning side occasionally fails
    to convert before the fifty-move rule (0.3-0.65% of games at 1+0.01).

Next. Version 2.0: a full tuning pass and multi-threaded search.
Then Chess960 and an NNUE.

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