(…taken from: https://wiki.changeringing.co.uk/Cambridge_Surprise)

Some Tips on the Blue Line
One way of looking at the line for Cambridge on any number of bells is to consider it to consist of three components, front work, back work and middle work.

Front Work
For the purposes of this exercise the Front work finishes after the double dodge at the back. The rule for the front work is to do the places at the front, treble bob to the back missing out the dodge before meeting the treble one 2 blows from the back, double dodge and lie.

Back Work
The Back work is from 3rd place bell, treble bob to the back, double dodge, lie, dodge with the treble, places below the treble, dodge with the treble, lie, double dodge and treble bob down to 3/4 becoming 4th place bell.

Middle Work
The Middle work can be rung by the “dodge N miss 2 dodge N places” rule where n is 1 for minor; 2 for major; 3 for royal; 4 for maximus etc

So in Major, having done the Front work, dodge 2 (becoming 6th place bell), miss 2 (ie miss the dodges either side of passing the treble), dodge 1/2 up, dodge 3/4 up and do 5/6 places. Now dodge 2 (7/8 up, 7/8 down), miss 2 (5/6 and 3/4 passing the treble in between), dodge 2 (1/2 down, 1/2 up) and do 3/4 places. Proceed to Back work.

Other useful pointers

• The lead end order is Plain Bob plus 1, i.e. instead of being 2-4-6-8-7-5-3-2 it is 2-6-7-3-4-8-5-2 (in Major).
• Course and after bells are met at the back.
• Course or after bell pass through you while you are making places.
• Places are made progressively from far to near (from 6th place bell perspective).
• If places are being made then (single) dodges occur at every dodging position in that slope.
• All places can be considered as dodge-far-near-dodge-far-near-dodge (far being furthest away from where you started, near being nearest to where you started on that slope).
• The middle dodge is with the treble and is in the direction the ringer is going (as are all the dodges during places).