Mystery Fish

How Mystery Fish changes the game

It secretly borrows another Fish's ruleset and a random difficulty, revealing both only after the game ends.

Its strength stays between 0 and 3,200 Elo.

Available difficulties

• Relaxed: 400 starting Elo
• Original: 800 starting Elo
• Ruthless: 1,200 starting Elo

How to play against Mystery Fish

Watch its strength changes and move patterns for clues, but prioritize sound chess until the hidden rule becomes apparent.

Community statistics

Games played

278

Wins

104

Player win rate

37.4%

Average game length

37.5 full moves

Related bots

• Gamble Fish — It rolls a new hidden Elo before every move; the complete sequence is revealed in game review.
• Loaded Dice Fish — You choose its Elo each turn and must use every available strength before the set resets.
• Spotlight Fish — Moving the highlighted piece makes it answer at low Elo; any other piece triggers its high Elo.

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