Sphinx position

d) Structure
The handlebars must be positioned in an area defined as
follows: above, by the horizontal plane of the point of support of the saddle (B); below, by the horizontal
line passing through the highest point of the two wheels (these being of equal diameter) (C);
at the rear by the axis of the steerer tube (D) and at the front by a vertical line passing through the front wheel spindle with a 5 cm tolerance (see diagram «Structure (1A)»). The distance referred to in point (A) is not applicable to the bicycle of a rider who takes part in a sprint, keirin or team** sprint**, but must not exceed 10 cm in relation to the vertical line passing through the front wheel
spindle.

This should clear things up, 5cm for enduro monkeys, 10cm for sprint

And as the sphincter bars are fairy's bars they will mostly fall into the 5cm rule.

I wonder how many people's bikes won't pass muster? it's usual at the nationals to have league riders made to move their set up just before an important race (Stelle, remember?) so it kinda makes sense to toe the line beforehand so you are not used to an illegal position.