There's tricks i' the world;
William Shakespeare, Hamlet, 4.V
The whole day it seems I forget something; that February, 15 is an important date, but why? Someone's anniversary, but whose ...
For the first time in the last 17 years I forget my father's day of death.
My memory is legendary, especially my memory of biographical data.
And now this ...

PLAY IT BY TRUST / WHITE CHESS SET
Play it for as long as you can remember
who is your opponent and
who is your own self.