No, no answers on this site - but I carefully (as much as I could) tested each one and recorded a detailed solution to most of them.
Originally I prepared these cards in response to a plea from Russian coaches, with an idea to give each student a test (8 puzzles to the card) at the start of the class, and then review the answers in a group afterwards. There is a big difference between glancing at the ready-made solution and trying to come up with the solution on your own. But, alas, no coaches responded, if they use the cards I have no idea.
But of course everyone should take a challenge - it is fun! Take a card, take just one position - solve it, write down your solution in the card's comments - something like this: Pos 4. 1. 12-34 56-78 2.34-56, etc. Also one can practice copying the diagram in the answers.
One can also print a few cards and take them to the club/park/barbershop to show/challenge other players.
They can run solving contests, create lots of excitement and generate pride from individual achievement.