Knight forks
A board of enemy pieces: click every square a knight could fork them from. About one board in four has none, and saying so is the answer there.
What it trains
The fork pattern itself: which squares see two pieces at once. A fork is easy to play once the square is seen and invisible while it has to be worked out, and the family of squares that hit king and queen together is the geometry most club games are decided by.
How to use it
Click every square a white knight could fork from, then check. The square has to attack two or more of the black pieces and be attacked by none of them; the king counts both ways, as a target (a check) and as a guard of the squares beside him. The board then marks what you found, what you claimed in error, and what you left out.
About one board in four has no safe fork square, and saying so is the answer there: a drill where a fork always exists would teach finding something whether or not it is there. What counts is stated on the page, so no answer is marked wrong by a rule you were not told, and a fork here is geometry, not a promise it wins material.
The other drills
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