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It's said 2D6 at close combat section but it shouldbe 3d6 and disgard the lowest according to swiftride specila rule.
How much do Cavalry units Flee / Pursue after break tests?

Not sure if this is a question, as you have answered yourself...

Cavalry have the swiftstride special rule. This rule overrides page 56 "A unit pursues 2D6"

You pursue by rolling 3D6 and choosing the highest 2.

As above.

They only list the base case for all rules. Special rules then override where they are more specific than the general rule.