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Did I got trolled by ECO?

I am trying to get to 3000 rating on opening's and tactics. I am starting to get only 3 points every time I get the 4 moves correct.

Today I want to share with you guys a crazy "problem".

http://es.lichess.org/training/opening/2802

Try to find the 4th move, just for you to understand how hard it was, I stopped thinking and started moving all my pieces to all possible squares one by one.

Once you find it, come here and post why you think that is a good move, cause I have no idea why it is lol.
I solved this debut puzzle in the following way. 1.d5 , 2.Re1 , 3.Bc2 , 4.Ra3 . I also, like you, had to sort through a lot of moves before I found the course Ra3 . Checked out the debut puzzle. Stockfish 7 . Here it moves . 1.d5 , 2.Bc2 , 3.Re1 , 4.Ba4 , 5.Bg5 , 6.Be3 , 7.Qd3 , 8.Ra4 , 9.Ra3 . Depth 24 was pretty decent. As you can see the engine with a rating of 3300 is also not coped with the debut puzzle. So no need to lose heart.
Rook to a3 for fourth move your rook is now protected
#1 Hi AntonioGlez04, I was hook to this puzzle until I begin doubt whether there is an answer. Then #3 voronn09 gave more than an answer, Ra3 and stockfish 7 capability. The rating of this puzzle is 1915 which I have not experience before so I do not have to lose heart. I lost 5 points on this puzzle but I had a nice time. Thank You and bye
Me gustaría hacer un torneo temático esta tarde con la posición inicial de la defensa bird eso A02,A03 como puedo colocarlo para que salga desde la posición inicial en el torneo ?

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