It's worth mentioning that Lee Sedol mentioned in an interview that even if he loses a single game against AlphaGo, he will have lost the match. He was expecting to win all 5 games.
I completely understand where you're coming from - without feedback telling you why the move you chose is incorrect, the exercises can become a bit frustrating.
We're aiming to make the site far more adaptive by tailoring error responses to your moves. At the moment, I'm going through the tactics in Train and tagging them with motifs and supplying explanations for the solutions. An idea is to track the most common responses and create specific messages to be shown when those moves are made.
We are using chessboard.js (http://chessboardjs.com/) for our board right now and I'm not sure if they support two-click yet. We may have to add it ourselves. Thanks for the note!
We're building an onboarding process for tactics so the objective is clearer, but the point of the section is to put you in a position that you might encounter over the board and have you find the optimal moves.
If black captures the hanging pawn, that is known as the Open Variation of the Ruy Lopez. I didn't want to get too deep into theory with this video as it was only supposed to outline opening ideas. White regains the pawn back due to his pressure on the e-file.
