The ultimate privacy-first chess companion running entirely inside your browser sandbox. Toggle effortlessly between unthrottled Stockfish 18 WASM tactical calculation and Maia-3 Neural Network human intuition that avoids robotic anti-cheat flags.
Searches millions of nodes locally with uncapped depth. Background pondering analyzes replies during opponent clock for zero-latency Instant Ponderhits.
Trained on real human database games. Avoids robotic calculation anomalies and reflects realistic human positional preferences, blunder probabilities, and pressure dynamics.
Switch between unadulterated tactical brute-force computation and neural network human intuition with a single tab click.
Classical brute-force computational power evaluating millions of tactical tree branches to pinpoint mathematically absolute candidate moves. Built for game analysis, blunder refutations, and deep calculation.
Trained on millions of real, professional human chess games. Evaluates positions using intuitive pattern matching rather than infinite tree searches, mimicking natural human play and bypassing robotic anti-cheat detection.
multiPV = 1 to present the single highest-probability human candidate
move without visual arrow clutter.
Everything built into ChessCompanion VIP to elevate your tactical analysis, opening repertoire, and realistic human sparring.
Triggers instant chess analysis every time a move is played on the board. Provides seamless, hands-free calculation updates in real time as you play or spectate live matches.
Calculates what the opponent's best response will be while it is their turn on the clock. Renders dotted predictive vector arrows so you can prepare your replies before they play.
Guided opening repertoire across both Engine and Human modes. Select from popular White and Black books (Queen's Gambit, Italian Game, Sicilian Najdorf, etc.) with seamless handoff to calculation once out of book.
Allocates 3000ms of unthrottled thinking time on your turn with uncapped search depth.
Furthermore, during your opponent's turn, it immediately runs speculative background pondering
(go movetime 3000 ponder). When your opponent plays the expected line, an instant
Ponderhit delivers deep Grandmaster analysis with 0ms waiting time.
In Engine Mode, a smooth slider lets you display up to 5 concurrent candidate lines on the board. Weigh tactical alternatives and branch depth side-by-side with color-differentiated arrows.
Exclusively in Human Mode, independently condition Maia-3 on ratings for both sides (Self Elo 600–2600 and Opponent Elo 600–2600). Simulate how a 2400 Master exploits a 1200 Intermediate or how a Club player responds to Grandmaster pressure.
Fine-tune move variety from precise greedy moves (0.1) to balanced human variety (0.35) and creative lines (0.6). The 85% Nucleus Filter physically blocks unnatural machine glitch moves.
Human Mode runs with dedicated multiPV = 1, predicting the exact #1 highest-probability human
move. Eliminates overlapping arrow clutter for crystal-clear visual clarity.
Test how ChessCompanion tunes neural model conditioning, temperature diversity, and tactical search depth in real time.
Simulates standard tournament club psychology with aggressive kingside initiatives and typical 1600 tactical vision.
Step-by-step master theory across White and Black repertoires with seamless computation handoff once out of book.
1. d4 d5 2. c4
1. e4 e5 2. Nf3 Nc6 3. Bc4
1. e4 e5 2. Nf3 Nc6 3. Bb5
1. d4 d5 2. Bf4 Nf6 3. e3
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6
1. e4 e6 2. d4 d5
1. e4 c6 2. d4 d5
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7
Your play data stays completely isolated. Every evaluation, neural weight execution, and license check operates 100% client-side.
License validation executes client-side using asymmetric public key cryptography. Zero network requests required to activate VIP access.
Tamper-proof time verification validates subscription lifespans locally without exposing your IP address or session tokens.
All client-side JS bundles are compiled with multi-stage control-flow flattening, dead-code injection, and string encryption.
Runs in browser MV3 WebAssembly and ONNX runtimes. No board coordinates, FEN strings, or game IDs are ever transmitted to third parties.
Unlike cloud analysis tools with 200–500ms network roundtrips, calculations execute with 0ms lag directly on your local CPU thread pools.
Maia models reproduce authentic human decision distributions to prevent algorithmic flagging on competitive online servers.
ChessCompanion integrates seamlessly with the world's premier online chess platforms, rendering zero-latency vector overlays directly over the game board without modifying core DOM events.
Full support for live blitz, rapid, classical, and analysis board interfaces with automatic FEN turn-sensing observers.
Native canvas SVG overlay rendering for ultra-smooth move arrows, opponent response predictions, and turn hooks.
Everything you need to know about the extension, anti-cheat safety, offline cryptography, and opening book expansion.
go movetime 3000 ponder) on the opponent's
most likely reply. If your opponent plays the expected move, an instant Ponderhit fires, delivering deep
Grandmaster tactical analysis lines with 0ms waiting time.
chrome://extensions in Chrome, Brave, or Edge), toggle on
Developer Mode, and click Load Unpacked. For custom profile sharing and
discussion, join our Discord at https://discord.gg/95JxUCbsgW!