Master chess through legendary games by replaying iconic positions and testing your calculation against the engine
The free endless dive trivia game where the rarest answer wins
Stage
Startup
Not given
Founded
2026
Not given
Based in
Not given
Not given
Pricing model
Freemium
Free
Pricing
Player plan: $4.99 per month or $50 per year. Yearly billing saves 16% and works out to $4.17 a month. Includes unlimited positions, record and export, 1080p quality, and basic AI analysis. 30-day money-back guarantee.
Not given
Key features
Replay iconic chess positions from legendary games
Test calculation against AI engine
Challenge friends with shareable links
Compare continuation against best engine line
Game recording and export
Basic AI analysis
1080p quality output
Play against engine from any position
Curated library of historic positions
Free position challenges without account
Seven prompts per dive with 25 seconds each
Six rarity scoring tiers from Plankton to One in a Krillion
Ocean depth visualization showing score as metres descended
Five real ocean zones from Sunlit Shallows to Hadal Trench
Unlimited mode for endless practice dives
Daily dive with same prompts for everyone
Multiplayer with pass-and-play or online rooms
Practice mode with no time pressure
Question bank with 172 hand-built questions
No account required; play as guest
What makes it different
Play from the exact moment of legendary games, not just study them
Designed for pausing chess videos to calculate positions
Step into the shoes of chess legends at critical game moments
Compare your moves directly against engine analysis
Built by an indie hacker solving a personal chess problem
Rewards rare answers rather than just knowledge or speed
Never reveals answer lists to preserve mystery
Completely free with no premium tier or paywall
Score visualized as real ocean descent through five zones
ReplayChess
Free Krillion