Who would win: three España-class battleships or SMS Kaiser?
Short answerThe Spanish force would probably win, but likely at a severe cost, with multiple España-class ships sunk, crippled, or left unserviceable.
NotesThe three Spanish ships would probably prevail, though at severe cost. SMS Kaiser is a much more formidable individual dreadnought, so the Spanish numerical advantage does not translate into three intact victors. At least one España is expected to sink and another could be sunk or crippled, leaving perhaps one ship that could return promptly to service. Winning the engagement is different from retaining an operational force afterward. Three-to-one odds therefore offer no guarantee of tactical safety or an inexpensive victory.