Now the solution meets the following requirements:
- A chess board that shows the position after each move
- The moves are shown
- Clicking on a move shows the position on the board after this move
- Autoplay
- It should be able to add variations
- Comments between the moves are possible
- Based on entering PGN-like moves
- Without the need to copy and paste all kind of code
- And not depending on the site of another person or company.
At the moment I haven't looked at the following wishlist
- A possibility to hide the moves (= solution) for puzzles
- Everything integrated within a single blogspot template
The original requirements can be found in this older post.