Does Jev search ahead like Stockfish or Leela?

No. Stockfish-style engines search millions of positions many moves deep; JEVChess scores the current legal moves once using king safety, material values, center control, and checks.

What happens if I deploy without a TypeSafe API key?

It still runs with heuristic fallback evaluation. Add the key under project settings or environment variables to enable live Jev inference.

How does match logging work on Vercel without a database?

Serverless filesystems are read-only outside /tmp, so completed matches persist in browser localStorage per username with a one-click JSON download; local runs also write ./logs files.

Can I force an illegal move or choose an underpromotion?

No. Standard FIDE movement, check, checkmate, stalemate, and auto-queen promotion are enforced, and pieces can only drop on legal squares.

What time controls does it offer?

Three: 3-minute Blitz, 1-minute Bullet and 5-minute Rapid. Running out of time immediately concludes the match as a Time Out defeat.

How do I run it locally?

With Python 3.11 run `python server.py` and open localhost:3000, which needs no Node install. With Node installed, run `npm install` then `npm start`; server.js is pre-configured for Vercel deployment.

What does Jev weigh when scoring a move?

King safety and check defence come first, then material exchange using relative values Queen 9, Rook 5, Bishop 3, Knight 3, Pawn 1, then center-square control and tactical pressure from checks or checkmate. It returns a confidence probability over the best move within roughly 10 to 50 ms.

CommunityJev Benchmarks & Evaluations

JEVChess — vamsi243

Minimal Chess.com-styled blitz and bullet chess app where Jev scores legal candidate moves in one parallel pass and reports confidence.

See highlights

Open github.com

Stars: 0
Language: HTML
Published by: Community
Author: vamsi243
Last verified: Oct 2026

vamsi243/JEVChess

User repository on GitHub

View on GitHub

JEVChess is an elegant, minimal chess platform designed around the chess.com aesthetic, It delivers rapid tactical responses using TypeSafe AI's **Jev** System-One model and heuristic fallback evaluation, without requiring any external database.

Forks: 0
Last pushed: Updated Sep 2026

Repo stats from the GitHub API, cached Oct 2026.Homepage

This is one of several Jev listings for the same project. The canonical entry is Jevchess — choxos.

About this project

JEVChess is an elegant, minimal chess platform designed around the authentic Chess.com aesthetic (#2c2b29 background, #4e7837 green squares, #ffffff white squares). It delivers rapid tactical responses using TypeSafe AI's Jev System-One model and heuristic fallback evaluation, without requiring any external database. All standard piece movements, captures, checks, checkmates, stalemates, and pawn promotions (auto-promotes to Queen for blitz speed) are strictly enforced.

Quoted from the project's README. Read the full README.

Tagscommunity github

Works forJev for Evaluation

Used inJev for Software & DevTools

Highlights

3-minute blitz, 1-minute bullet, and 5-minute rapid clocks with mandatory per-user match logging.
Single-pass Jev evaluation of legal moves with confidence, backed by heuristic fallback scoring.
Zero-framework vanilla UI with bundled chess rules engine and three backends: Python, Node, and Vercel.
REST endpoints for connectivity test, move selection, game saving, and per-user log fetch.

Watch out

Move quality is blitz-reflex heuristics plus Jev confidence, not deep search; expect tactical play, not engine-strength chess. Copy reviewed against the repository README on 2026-10-04, not from running it.

Questions about this entry

Short answers drawn from the linked project or page.

More Jev resources like this

jev-evals

Rubric-based eval harness that judges LLM and agent outputs with Jev through the Vercel AI Gateway, answering all rubrics for a case in one round trip.