What it attacks
An empty board and one piece: click every square it attacks.
What it trains
The geometry tactics are built from. A fork is easy to spot once you already see every square a knight reaches, and invisible while each one has to be worked out.
How to use it
Click every square, then check. The whole set has to be right: the board then marks what you got, what you claimed in error, and what you left out.
Knight, bishop and king, mixed or one at a time. The rook and the queen are left out deliberately: a rook sees the same fourteen squares from everywhere, and a queen sees up to twenty-seven, which is clicking rather than seeing.
The other drills
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