The chess board is not interactive. You cannot move pieces and check if you guessed it right. Instead, you need to keep your solution in mind and then click the ‘Show Solution’ button and compare.
Click on the E7 square in order to flip the view of the board (click D2 to get back).
I want to give credit where credit is due. Thank you pgn4web for all the PGN games replay script and the tactics used in this page.