README.md

---
license: gpl-3.0
---

<p align="center">
  <img src="https://cdn-uploads.huggingface.co/production/uploads/61dd07bafdc070745eed96fd/Q1OaUACXEp-nc0KhjBqw-.png" alt="Ultimate Fish logo" width="200">
</p>

# Ultimate Fish endgame tablebases

This gated dataset is the authenticated tablebase catalog used by the
[Ultimate Fish](https://github.com/SanderGi/Ultimate-Fish) engine and its local
tablebase manager. The tables contain exact win/draw/loss and distance-to-win
results for certified Chess Ultimate endgames.

## Native rules repair — 2026-09-12

The Checker and Sniper closures and their Jester/Ghost information proofs have
been recomputed for native flying Checker Kings and turn-start threat timing.
All twelve Devil partitions have fresh outcomes and distances, verified against
the corrected native terminal rules. Historical sorted Devil keys were reused;
historical outcomes were discarded and every successor was checked for closure.

Affected `.uftb` tables use UFTB version 12 with a rule-revision codec tag.
The Devil records use UFDS version 2. Update the engine before installing these
files; the corrected engine rejects the older affected formats. All other
certified payloads are unchanged. The repair proof inventory is stored in
`certificates/ultimate-rules-repair-20260912.json`.

## Information plot orientation correction — 2026-09-14

The opposed Ghost/Checker and Ghost/Sniper root audits previously interpreted
the UFIW2 secondary-piece color as the Ghost owner's color, reversing W/L.
The audit reader and plot metadata are corrected. Every repaired information
overlay now passes exact solver-versus-audit W/L/D equality for each side
before trivial-position filtering. The certificate records those checks.
All tablebase and information payload bytes remain unchanged; no solve was
repeated. UFIW2 byte 20 denotes secondary color, with the primary normalized
White; Ghost force bits denote owner/observer, and Jester bits White/Black.

## Lone-Ghost native input and progress certificate — 2026-09-14

The previous `kghostk.uftb` used obsolete invisible-Ghost capture rules and
failed 36,760 native Bellman/singleton comparisons. It is replaced by the
exhaustively regenerated `11b7b57a…` payload that matches the retained UFGM
concrete binding. `kghostk.ufiw` and `kghostk.ufgm` are regenerated, and
`kghostk.ufrp` stores certified first-activation reachability ranks.

All 49 activation layers, the full symbolic Bellman equations, all 1,971,840
singletons, and full rank serialization passed validation. The force diagram
is equivalent to the retained reference over all masks. An independent native
sample covered 17,270 edges; runtime tests completed eight owner games and
checked both strategies, colors, reflections, selected actions and repetition
rejection. The sample supplements the exhaustive generator proof.

This release covers lone-Ghost masks in supported observation cells. UFIW
remains a fresh-root overlay; absence of either force remains unresolved.
Other materials have no new progress certification in this release. Arbitrary
repetition history requires the runtime's separate complete-policy check.
Hashes and source/model bindings are in
[the certificate](certificates/information-progress-kghostk-20260914.json).

## Lone-Jester finite progress ranks — 2026-09-14

`kjesterk.ufrp` preserves the finite solver's activation ranks for all supported
indistinguishable royal pairs. The concrete table regenerated with the same
published hash; all 985,920 fresh-root payload bytes also match the previous
UFIW. The new UFIW header binds the rank-preserving source model.

The complete fixed point and rank serialization passed. An exhaustive native
runtime audit covered 412,600 information cells and 7,914,824 edges, including
irreversible identity disclosure and concrete suffixes, with zero progress
residual. Runtime tests completed eight Jester-owner games (120 progressing
actions) across both strategies, colors and reflections.

No still-ambiguous bare-King pair has a guaranteed win in this certificate.
Neither-force outcomes remain unresolved. Repetition history still requires
the runtime's separate complete-policy proof; four-piece Jester and other
material progress coverage is not supplied by this release. Full bindings and
limitations are in [the certificate](certificates/information-progress-kjesterk-20260914.json).

## Bishop/Ghost concrete input repair — 2026-09-14

`kbishopkghost.uftb` now matches the native rules and the concrete hash already
bound by both published information companions. Exhaustive regeneration
verified 75,915,840 states and 931,510,904 edges, including WDL and DTW. The
obsolete published payload differs at 232,580 WDL entries. The UFIW and UFGX
companions are unchanged; this release does not add information progress ranks
or certify new history-aware policies. See [the repair certificate](certificates/native-concrete-kbishopkghost-20260914.json).

## Giant/Ghost concrete input and binding repair — 2026-09-14

`kghostgiantk.uftb` now matches the native rules: exhaustive WDL/DTW
regeneration verified 75,915,840 states and 496,847,352 edges. The obsolete
published concrete file differs at 839,460 WDL entries. The new concrete
file's complete normalized WDL hash exactly matches the input bound by the
retained UFGI. The UFGI and UFIW concrete-hash fields were rebound; every other
byte, including original model provenance and force payloads, is unchanged.
This repair adds no information progress ranks or history-policy coverage.
See [the repair certificate](certificates/native-concrete-kghostgiantk-20260914.json).

## Jester versus Knight progressing certificate — 2026-09-14

`kjesterkknight.ufrp` retains the finite royal-ambiguity ranks. Exhaustive native
validation checked 1,527,972 information cells and 40,580,546 edges, including
2,592,018 lower-material edges, with zero progress residual. Eight complete
runtime games verified both strategies, colors and reflections, exact selected
captures, and continuation into the certified lone-Jester class. Runtime wins
use complete bounded history/repetition policy proofs; neither-force remains
unresolved. There are no observer-pair forced wins in this class. This does not
certify a complete two-player history representation or improved playing strength.
See [the certificate](certificates/information-progress-kjesterkknight-20260914.json).

## Additional primary-Jester progressing certificates — 2026-09-14

`kjesterknightk.ufrp`: exhaustive native audit of 15,339,334 finite information cells and 359,459,660 edges, zero residual; eight complete runtime games cover both strategies, colors and reflections. [Certificate](certificates/information-progress-kjesterknightk-20260914.json).

These releases preserve lower-material continuation and exact selected-action checks. Neither-force remains unresolved. The runtime guarantee is conservative against a fully informed adversary; no full two-player history or playing-strength improvement is claimed.

## Additional primary-Jester progressing certificates — 2026-09-14

`kjesterqueenk.ufrp`: exhaustive native audit of 14,316,342 finite information cells and 467,536,174 edges, zero residual; eight complete runtime games cover both strategies, colors and reflections. [Certificate](certificates/information-progress-kjesterqueenk-20260914.json).

These releases preserve lower-material continuation and exact selected-action checks. Neither-force remains unresolved. The runtime guarantee is conservative against a fully informed adversary; no full two-player history or playing-strength improvement is claimed.

## Canonical K+Queen lower repair — 2026-09-14

`tablebases/kqk.uftb` now uses the canonical native codec/model binding required by the certified same-side Queen/Jester progressing proof. Exhaustive comparison covered 985,920 states with zero WDL or DTW-byte differences; the replaced file carried a stale edge-count/model header. [Certificate](certificates/concrete-native-kqk-20260914.json).

## Opposed Fisherman/Ghost progressing certificate — 2026-09-15

`kghostkfisherman.ufrp` retains exact activation ranks for the arbitrary correlated Ghost-mask sidecar. Generation used 64 native transition/audit shards and exhaustive all-mask projection; runtime validation checked complete selected policies for both strategies, colors and reflections. [Certificate](certificates/information-progress-kghostkfisherman-20260915.json). Neither-force remains unresolved and no playing-strength improvement is claimed.

## Knight/Ghost progressing certificates — 2026-09-15

Both same-side `kknightghostk` and opposed `kknightkghost` now include authenticated arbitrary-belief UFGD and exact UFRP activation ranks. Each class passed 64 native transition shards, the full exact symbolic proof, an independent all-mask verifier and engine policy tests for both strategies, colors and reflections. [Certificate](certificates/information-progress-knight-ghost-20260915.json). Neither-force remains unresolved; no complete two-player epistemic-history or playing-strength claim is made.

## Opposed Bishop/Ghost progressing certificate — 2026-09-16

`kbishopkghost` now includes authenticated UFIW, arbitrary-belief UFGD and exact UFRP activation ranks. The class passed 64 native transition shards, the exhaustive symbolic proof, an independent all-mask verifier, and engine policy tests covering both strategies, colors and reflections. [Certificate](certificates/information-progress-bishop-ghost-opposed-20260916.json). No complete two-player epistemic-history or playing-strength claim is made.

## File roles

- `tablebases/*.uftb` are the ordinary runtime tables probed by the engine.
- `tablebases/kdevilk-{a1..d3}.ufds` are the twelve logical fixed-square
  partitions of the certified stateful
  King+Devil+causally-spawned-Minions vs King class. Partitions below the
  hosting service's 50 GB object limit are stored directly. Larger partitions
  use an authenticated `.ufdsm` manifest plus ordered `.ufdsp` transport
  shards. The manager verifies every shard, reconstructs and verifies the
  certificate-bound canonical `.ufds`, removes the transport shards, and only
  then installs it. All twelve canonical partitions are one logical runtime
  table and must be installed together.
- Files such as `.ufiw`, `.ufgd`, and the other `uf*` sidecars are authenticated
  proof/dependency data. The manager installs sidecars with their table; they
  are not substitutes for a runtime `.uftb` or `.ufds` file.
- `certificates/ultimate-devil-stateful-class-certificate.json` binds the exact
  twelve Devil partitions, their sizes, SHA-256 hashes, outcome censuses, and
  aggregate conservation result.
- `manifests/tablebases-sha256.json` is the machine-readable, revision-bound
  catalog of every managed artifact.

Every managed artifact is stored with a Hugging Face LFS SHA-256. The Ultimate
Fish manager refuses catalog entries without that digest, validates shard
manifests and byte conservation, verifies the complete logical download, and
only then atomically installs it.

## Install and probe

Request access to this dataset and authenticate the Hugging Face CLI. Start the
local engine bridge with `ULTIMATE_TABLEBASE_PATH` set to the desired tablebase
directory, then use the Tablebases panel in the Ultimate Fish UI to install or
remove endgames. For example:

```bash
cd ui
ULTIMATE_TABLEBASE_PATH=/absolute/path/to/tablebases npm run engine
```

The engine scans `tablebases/` by default and accepts a colon-separated
`ULTIMATE_TABLEBASE_PATH`. It probes only codec-compatible, structurally valid
files and fails closed on malformed headers, extents, ordering, or stateful
Devil records. Files installed while the local bridge is running are picked up
by a clean engine reload before the next queued operation.

See the repository's
[`tablebases/README.md`](https://github.com/SanderGi/Ultimate-Fish/blob/master/tablebases/README.md)
for the authoritative class ledger, model exclusions, and certification notes.