Every numbered square counts the pieces attacking it. Place all your pieces so that each
number is matched exactly.
The Goal
The rook and the knight both attack the marked square, so it reads 2.
Attacks Pass Through Everything
A sliding piece is not blocked by your other pieces, or by numbers. The rook's attack runs
straight through the knight to the square beyond.
Holes Stop an Attack
Gaps in the grid are the one thing that does block an attack. The square to the right counts
the rook. The square to the left, past the gap, does not.
Pawns Only Go Up
A pawn attacks the two squares diagonally above it, and nothing else. It is the one piece that
cares which way up the board is, so a pawn on the top row attacks nothing at all.
Knights Jump
A knight ignores gaps entirely. It never travels through the squares between.