Want to play against Stockfish 18 online? On Rama Chess there is a free Stockfish 18 bot that runs the real engine in your browser. This guide shows you how to start a game, what the levels and Elo numbers mean, how to score points against it, and three real Stockfish 18 games on replay boards.
Open the Stockfish 18 bot page. It is free and you install nothing. Then:
The first game takes a moment. The bot runs the real Stockfish 18 (the official version, built for the browser) on the cores of your own device. Its neural network files are about 112 MB. Your browser downloads them once and keeps them. While they load, the top line says "Loading Stockfish 18", and the small Stockfish 19 Lite engine plays the moves for it. When the top line shows "Stockfish 18" and the number of threads, the real engine is playing.
If you want every move to come from Stockfish 18, play White and make your first move only after that line appears. On an old phone or browser that cannot run it, the line says it could not start, and Lite plays the whole game.
During the game you have Hint, Undo, the eval bar and "See what the bot is thinking" (30 free looks a day). After the game, Analyse opens it in the Analyser.
The Stockfish 18 bot has no level slider. It always plays at full strength, and it thinks up to about 3 seconds a move (less on a fast clock). That is the point of this bot: the real engine, not a weaker copy.
Stockfish 18 itself has two settings that make it weaker, if you use it in your own chess program:
Skill Level from 0 to 20. Level 20 is full strength.UCI_LimitStrength + UCI_Elo from 1320 to 3190. This scale was fitted to engine games, so it is only a rough guide to human ratings.Want to play by level on Rama Chess? Use the Rama Chess Engine bot. It has a slider from level 1 to level 25:
| Rama Chess Engine level | About | Who should play it |
|---|---|---|
| Level 1 | 500 Elo | You just learned how the pieces move |
| Level 5 | 983 Elo | Beginner, still loses pieces |
| Level 8 | 1345 Elo | Casual player |
| Level 11 | 1708 Elo | Club player |
| Level 14 | 2070 Elo | Strong club player |
| Level 17 | 2433 Elo | Expert / master level |
| Level 20 | 2795 Elo | Grandmaster level |
| Level 23 | 3158 Elo | Near engine strength |
| Level 25 | 3400 Elo | The top of the slider |
Levels go from 1 to 25 in steps of about 120 Elo. These numbers are the site's own scale for the bot, not FIDE ratings.
How strong is full-strength Stockfish 18? On the engine rating lists (checked 15 October 2026) it is rated 3649 on CCRL 40/15 with 4 CPU cores, 3772 on CCRL Blitz (1 CPU) and 3621 on CEGT 40/20 (1 CPU). These are engine-vs-engine ratings, not FIDE ratings. The full table for every version is on our Stockfish Elo page.
Be honest with yourself: at full strength, in a normal game, no human player today is expected to beat Stockfish 18. The best humans are rated around 2800 FIDE, and the engine is far stronger than that. In 2006 the world champion Vladimir Kramnik lost a match to Deep Fritz 4-2, and engines have become far stronger since then.
So set goals you can reach:
More ideas, including which anti-engine tricks still work, are in how to beat Stockfish.
Before you play it, see how it plays. All three games are real engine games from CCRL tests in 2026, with Stockfish 18 as White. Evaluations in the comments are by Stockfish 18 itself at depth 20.
What to learn: The engine counts king safety, not only material. Seven points down and still better: that is how far a bad king can matter.
What to learn: Against Stockfish a wild sacrifice rarely works: it checks every reply. If you attack it, be sure you have counted the checks to the end.
Key idea: A pawn storm needs a safe king of your own and rooks behind the pawns. Stockfish moved its king and rook first, then pushed.
You can play these opponents too: Arasan and Viridithas are bots on our site.
On our channel the new Stockfish 19 plays its older version, Stockfish 18, and gives up three pieces. Watch it, then decide which version you want to face.
Stockfish 18 came out on 31 January 2026. Stockfish 19 followed on 5 September 2026. The Stockfish team measured Stockfish 19 at up to +44 Elo over Stockfish 18 in its own fast tests. On the slower CCRL 40/15 list the two are almost level (3650 vs 3649), because top engines draw most normal games.
For you as a player the difference does not matter much: both are far stronger than any human. Choose by what you want:
The full comparison is in Stockfish 19 Elo and on our Stockfish page.
Yes. The Stockfish 18 bot on Rama Chess is free and runs in your browser. The first game downloads the engine's network files (about 112 MB) once.
Yes. It is the official Stockfish 18 built for the browser and running on your own device. Only while it is still loading, or on a device that cannot run it, does Stockfish 19 Lite play the moves.
Stockfish 18 has Skill Level 0 to 20 and a UCI_Elo setting from 1320 to 3190. The Stockfish 18 bot on Rama Chess always plays at full strength; for levels 1 to 25 (about 500 to 3400 Elo) use the Rama Chess Engine bot.
Not at full strength in a normal game; it is far stronger than the best humans. You can beat it with odds, such as starting without its queen, or beat a lower-level bot and climb.
On the lists checked on 15 October 2026: 3649 on CCRL 40/15 (4 CPU), 3772 on CCRL Blitz (1 CPU) and 3621 on CEGT 40/20 (1 CPU). These are engine ratings, not FIDE ratings.
Yes, a little. The Stockfish team measured up to +44 Elo in fast tests, but on CCRL 40/15 the two are only one point apart. You can play both on Rama Chess.
Pick the slowest clock, play your own opening and see how many moves you can last.