The Championship Course from Mortlake to Putney on an ebb tide or from Putney to Mortlake on a flood tide. Since the Boat Race moved to this course in 1845, it has always been raced on a flood tide from Putney to Mortlake except in 1846, 1856 and 1863. The Wingfield Sculls is also raced from Putney to Mortlake. Most other events race on an ebb tide from Mortlake to Putney. In April 1869 the Harvard University Boat Club challenged Oxford University Boat Club to an "International University Boat-Race" of coxed fours on the Boat Race course. The event took place on 27
Head of the River Race Head of the River Race The Head of the River Race (HORR) is an against-the-clock ('processional') rowing race held annually on the River Thames in London, England between eights, other such races being the Schools' Head of the River Race, Women's Head of the River Race and Veterans' Head of the River Race. Its competitors are, with a few experienced junior exceptions, seniors of UK or overseas competitors and it runs with the ebb tide down the 4.25 mile (6.8 km) Championship Course from Mortlake to Putney which hosts the Oxford and Cambridge head-to-head races usually between one and two