Using the last couple of seasons at this fixture as an example, the main strategy under Moyes/Eusebio seems to be. Go all out in the first half and hope to score a goal or two and sit back and make it difficult for us to score again. and to be fair that strategy worked.
This fixture is annoying for so many reasons, it reminds me of Celta at Balaídos. We are confident enough to pump 3+Goals pass them at the Camp Nou, but over there we always seem to never have the right state of mind/tactics and we struggle to play against them and lose.
Today Eusebio, had a plan and that was to press us high and hard off the get go to make us as uncomfortable and it was actually working as they scored two goals+that disallowed one. I think they were hoping to get to half time without conceding and after that would sit back.
But Paulinho scored, and that played a part in them losing that edge they had the whole half. Second half started Valverde, made the right adjustments/talk behind the scenes and despite that early chance that Stegen saved it went downhill after that. Suarez scored that incredible goal to get the equalizer and La Real were getting tired and we were forcing mistakes out of them.
Valverde has had quite a bit of success at this fixture under Bilbao so he probably knew this was going to happen.