(CNN) -- Coach Jose Mourinho has told his Real Madrid players to heed the wisdom of Albert Einstein ahead of Wednesday's Champions League semifinal first leg against Spanish arch-rivals Barcelona. Having been crushed 5-0 by Barca in this season's first "Clasico" clash in the Catalan capital in November, Mourinho has successfully resorted to more defensive tactics to earn a draw at the Santiago Bernabeu and then victory in the Spanish Cup final last Wednesday. Real's strategies in those matches bore more resemblance to the Portuguese coach's winning formula against Barca while in charge of Inter Milan in last season's Champions League semis than the all-out attacking blitz that saw Madrid crush Valencia 6-3 on Saturday.
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Jose Mourinho tells his players that willpower can overcome the most powerful forces
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Real Madrid play Barcelona for the third time this month in first leg of semifinal
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Mourinho guided Inter Milan to victory over Barca in last-four stage in Europe in 2010
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Spanish champions boosted by return of captain Carles Puyol but Andres Iniesta is out
"I told my players there was someone called @placeholder, Albert Einstein, who said that there is a force more powerful than steam, electricity and atomic energy: will.