Good capture or a blunder? Decide before you move.
You want to take a piece at once, but many blunders start with a capture: the piece was defended, or the capture opens a tactic. Checking the reply before you move saves the most points.
The trainer shows a position and an arrow with a capture. Say whether it is good. Positions come from lichess puzzles and are checked by Stockfish. A blunder is a capture after which the side loses at least three pawns or gets mated. A good capture takes an undefended piece or a clearly more valuable one. Trades and sacrifices are left out: they have no clear answer. After the answer an arrow shows the refutation.
A capture after which the side loses at least three pawns by the engine evaluation or gets mated. For example, a queen takes a defended pawn.
Trades and sacrifices are left out: whether they are good depends on the position. Only clear cases are here: the piece is undefended, you take a more valuable piece, or the capture loses material.
By the number of pieces: up to 12 on Easy, 13 to 20 on Medium, more than 20 on Hard. Easy has only what you can see in one move: an undefended piece, an instant recapture or mate in one.
Yes, the trainer is free and works without sign-up.