Borussia Dortmund and Schalke 04 are separated by 19 points in the table but on Saturday, the two clubs will be uncomfortably close once more, forced to tussle with each other in the bear-pit of the Veltins-Arena. Proximity breeds contempt and it’s felt most keenly in the “Revier”, the post-industrialist heartland of German football, where neighbourly animosity verges on the pathological.
Those in charge on either side of the Yellow-Blue tribal divide have been at pains to stress that relations…