400 ELO Chess Bot: Play Moss Free
Moss is the 400 ELO chess bot on ChessRank, one of twelve bots on a ladder from 0 to 3000 ELO. Play Moss free right here in your browser, with no login, no ads and no daily limit.
Moss takes a piece you leave hanging more often than not, but still gives its own pieces away and rarely has a plan. That makes it the right opponent for the habits that win games at this level: develop your pieces, castle early and check that everything is defended before you move.
How to beat Moss
Take what is free
Before every move, check whether the bot left a piece undefended. At this level most games are won by simply collecting free material.
Keep your pieces safe
After each bot move, ask what it now attacks. Moving or defending an attacked piece is half of winning at this level.
Finish with checkmate
Once you are ahead, trade pieces, promote a pawn and practise the basic mates with a queen or a rook. Ask Chess Coach for a hint if you cannot find the mate.
How to play Moss
Choose your colour
Moss is already selected above. Pick White, Black or Random and, if you like, a clock.
Play and ask for help
Move by dragging or tapping. Ask Chess Coach for a hint or take a move back whenever you want.
Review and climb
When the game ends, get a full Stockfish review with your accuracy. Win comfortably and move up to the next bot.
Frequently asked questions
How strong is the 400 ELO chess bot?
Moss plays to a target of 400 ELO. Like every bot from 200 to 2000 it is a real Stockfish engine held back to its rating, so it makes the kind of mistakes a 400 player makes instead of playing perfectly and then blundering on purpose.
Is playing the 400 ELO bot free?
Yes. Playing Moss is completely free, with no ads, no login and no daily limit, because the engine runs in your own browser.
What if Moss is too easy or too hard?
Win comfortably and move up to Juniper at 600 ELO. Lose every game and drop down to Bramble at 200 ELO. Close games against a bot near your level teach you the most.
Can I review my game against Moss?
Yes. When the game ends you get a full Stockfish game review with accuracy for both sides and every brilliant move, mistake and blunder marked, the same review you can run on your chess.com and lichess games.