Guides
What a chess engine is actually telling you, and what it is not.
Every position that appears in one of these has been checked against Stockfish before publication — including the ones that came back disagreeing and made us rewrite the sentence around them. It is a lower bar than it sounds like, and most of what is written about chess engines does not clear it.
How to tell if your opponent is cheating
Why the accuracy score proves nothing, what a position with only one answer looks like, and how detection actually works.
The printable chess cheat sheet
Piece values, notation, the four mates worth knowing by shape and the king-and-pawn ending to learn before any other. Made to print.
What the eval bar is actually telling you
What +1.4 means, why the engine changes its mind, and the point past which more search buys you decimal places rather than a better move.