You took 0 so I took 0. Ok, there's 41 marbles left, and you could take up to 5.
(Sunday, 22 April, 2018.)
There's a pot in the middle of the table full of marbles. we take it in turns to take a few, you go first. The objective is to take the last few and leave just 1 marble in the pot. There is a knack, but one slip.... so you have to work at this one.