When looking for all checks during the FAC (Find All Checks) exercise, it can be quite annoying when you have to find 8 checks, and you can only find 7 of them. Your average starts to nosedive, while your frustration hits the ceiling.
The rook, bishop and knight are easy to check. They each can give check in maximum two different ways.
|White to give check|
By dividing the 9 possible checks in 3 sets of 3 checks, it all becomes more manageable.
When the queen and the king are on adjacent files, there are 3 squares next to the king, where the queen can give check. Imagine that the king is on d7, while the queen is on e1, then there are still 3 squares next to the king where the queen can check. I call this set of 3 checks "queen moves like a rook"
|Queen moves like a rook|
|Queen gives check like a rook|
|And even more stretching|
Here I found 12 checks. So matters are a bit more complicated. Well, it was worth a try :D
|Is 12 checks the maximum?|
This means that the next diagram is more appropriate:
|3 checks per line max.|