Play Chess Against Computer
Choose your opponent from 11 AI bots ranging from 400 to 3650 ELO. Each bot plays at a calibrated difficulty powered by Stockfish 18.
Free — no signup required
Our 11 AI Chess Bots
Every bot uses Stockfish 18 calibrated to a specific ELO level. Lower bots make realistic mistakes — they don't play random moves. Higher bots play increasingly accurate chess. Salazar at 3650 ELO uses full Stockfish strength with no limitations.
Wobble
400 ELO
Blinky
800 ELO
Gizmo
1100 ELO
Sparky
1400 ELO
Bolt
1700 ELO
Nova
2000 ELO
Phantom
2300 ELO
Titan
2600 ELO
Magnus
2900 ELO (Premium)
Demon
3190 ELO (Premium)
Salazar
3650 ELO (Premium)
How to Improve by Playing vs AI
Playing against computer opponents is one of the most effective training methods — but only if done right. Here's the approach chess coaches recommend:
- Pick the right difficulty. Choose a bot 100-200 points above your level. Win ~30-40% of games. Too easy builds bad habits. Too hard teaches nothing.
- Play seriously. Think about every move. Treat it like a rated game.
- Analyze after every game. Use the Chess Calculator's AI Coach to review your moves. Understand what you missed.
- Move up when winning consistently. Beat a bot 3 times in a row, move to the next level.
Why Play Chess Against Computer Here?
- 11 bots at precise ELO levels — calibrated play using Stockfish's UCI_Elo, not random difficulty
- Free to play — all bots accessible, Premium unlocks elite bots (2900-3650 ELO)
- AI Coach reviews your games — understand exactly where you went wrong and why
- Powered by Stockfish 18 — the same engine grandmasters use for tournament preparation
- No download needed — play instantly in your browser on any device
- After each game, use Hint to see what the engine recommended in critical positions
Frequently Asked Questions
How do I play chess against the computer?
Go to the Chess Calculator homepage and choose a bot from the difficulty selector. You play as white, the AI responds automatically. Use the Hint button to see what the engine recommends.
What difficulty levels are available?
11 AI bots from 400 ELO (beginner) to 3650 ELO (full Stockfish). Low-rated bots make realistic mistakes. Free users access up to 800 ELO, Premium unlocks all bots to 3650.
Is playing chess against computer free?
Yes, all 11 bots are available. Free users play bots up to 800 ELO. Premium ($19.99 for 30 days) unlocks elite bots including Magnus (2900), Demon (3190), and Salazar (3650).
Can I get hints while playing?
Yes. Click Hint during your turn to see the engine's best move. Play your best move first, then check what Stockfish suggests and learn why.
What engine powers the bots?
All bots use Stockfish 18 (3500+ ELO). Lower bots use UCI_Elo to simulate human-like play at calibrated strength levels.
How do I improve by playing vs computer?
Choose a bot 100-200 points above your level. Win ~30-40% of games. After each game, analyze with the AI Coach to understand mistakes. Move up when winning consistently.