WhyThisMoveBeta
LEARN BY PLAYING

Develop the chess intuition of a Grandmaster.

Play chess against GPT-5, Claude and Gemini, understand the idea behind every move, and improve game after game.

83M+games analyzed
11,000+blunders catalogued
5+LLM models to challenge
Challenge Gemini 3 →Start free

No payment required • 1000 free credits included

Works withLichessChess.com
Powered byStockfishLichess DBMaiaMulti-LLM
Challenge Gemini 3
You
VS
Gemini 3
Your move
Your move
8
7
6
5
4
3
2
a1
b
c
d
e
f
g
h
83M+games analyzed
11,000+blunders catalogued
5+LLM models to challenge
THE PROBLEM

Sound familiar?

Traditional chess tools give you answers without understanding.

01

Stockfish says play this

Nf3 +0.8

→ But why is it good?

02

You memorize openings

1.e4 e5 2.Nf3 Nc6...

→ But forget them mid-game

03

Videos analyze GM games

Magnus vs Hikaru

→ But not YOUR positions

04

Same mistakes, again

-1.5 blunder detected

→ Because no one explains WHY

THE SOLUTION

4 AI engines. One answer.

We combine the world's best chess AI with cutting-edge language models.

Stockfish

~30ms

Objective analysis

  • Precise evaluation in centipawns
  • Best lines calculated in depth
  • Critical moment detection

Lichess DB

83M games

Collective wisdom

  • Statistics from millions of games
  • Real win rates per move
  • Move popularity by ELO

Maia

800-2800 ELO

Human psychology

  • Predicts human moves
  • Analysis by skill level
  • Identifies anti-human traps

Multi-LLM

GPT-5 • Claude • Gemini

Natural explanations

  • Plain language explanations
  • Multiple AI models available
  • Compare your alternatives
FEATURES

Everything you need to finally get it

AI Coach screenshot

AI Coach

Ask any question about your position and get clear explanations. The coach shows candidate moves with arrows and explains the ideas behind each variation.

  • Natural language explanations
  • Visual arrows on the board
  • Progressive hints system
  • Works in 11 languages
TESTIMONIALS

What players say

“I followed engine moves for years. I never improved. Because I never understood. WhyThisMove changed everything.”

M
Marcus Chen1400 → 1850 in 3 months

“The Blunders database is genius. I found out I was making the same mistake as 78% of players at my level!”

S
Sarah K.1420 Chess.com

“Finally an AI that explains chess like a real coach. The progressive hints are perfect for learning.”

T
Thomas R.2100 FIDE
EXPLORE

A chess library built from 83M+ analysed games

Opening guides, key positions and the reasoning behind the best move — free, and open to everyone.

FAQ

Frequently asked questions

Everything you need to know to get started

Is the site really free?

Yes, 100% free! All features are available at no cost. No payment, no subscription, no credit card required.

Do I need to create an account?

No to try. Yes to save your games and access all features.

Can I use the app in my language?

Yes, the interface and explanations are available in 11 languages including English, French, Spanish, German, and more.

How do I import my games?

You can paste a PGN, upload a file, or import directly from your Lichess or Chess.com account with your username.

Is the voice coach available on mobile?

Yes, the voice coach works on mobile via the browser. Latency of about 100ms allows for fluid, natural conversation.

Is my data shared?

No. Your games and analyses remain private. We use secure authentication (JWT) and never resell data.

What's the difference between quick and deep analysis?

Quick analysis (~2-5 seconds) gives immediate understanding of the move. Deep analysis (~10-15 seconds) explores variations and provides more detailed explanations.

Will there be paid features in the future?

Currently, all features are free. If we ever introduce premium features, existing features will remain free.

Have more questions? Contact us

Your next game could be your breakthrough.

Start understanding chess today. 100% free to start.

Start Your Journey →No payment required • 1000 free credits included