Ok here's a challenge for the retired engineers in our Challenge Family

Get out your slide rule, and your Abacus!

Scene: Your age is moving inexorably onward. You realize that you are older and older every minute!
PREPARE!!

Be ready!

Make your own Checkerboard using Qimage!!

You can print it on any paper; spill coffee on it, and throw it away. Print another one.
Whatever size paper you want to use, just make a square print.

A bonus!!   Screen image 052 is showing your checkerboard with a small mat which contains your name and your phone number in case you forget.

It took about 10 minutes to make this...  
Hint: The black squares are created by using page background  color in black.

Have Fun!!
Click the pictures to enlarge
Fred