If I were pricing this race from scratch for the Betfair Exchange, considering form, Timeform ratings, trainer trends, and pace dynamics, my odds in a 100% book would be:

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Explanation of Adjustments:

Rubaud (6/4, 40.0%)

Holds the best raw ability and Timeform rating (166).

Nicholls’ 6 wins in the last 10 runnings strengthens the case.

The stamina query makes him drift slightly from the current 11/8.

Imperial Saint (9/4, 30.8%)

Solid chase form and proven stamina.

More reliable than Rubaud over the trip.

Kept fairly close to Rubaud in odds due to stronger proven form at 2m4f.

Ashdale Bob (11/2, 15.4%)

The most experienced runner and proven at 2m4f+.

Irish-trained horses have a strong record in UK Graded races.

Bigger than 13/2 on the books due to possible lack of finishing speed.

Boombawn (14/1, 6.7%)

Skelton’s runners often progress, but 22-length defeat last time is a worry.

Weak pace scenario doesn’t suit a hold-up style.

Slightly bigger than the 14/1 offered by bookies.

Mark Of Gold (20/1, 4.8%)

Recent Sandown defeat (beaten 17L) exposed limitations in this class.

Unlikely to be involved unless others underperform.

Bhaloo (40/1, 2.4%)

Pulled up on last two starts.

Trainer/Jockey strike rates at Kempton justify not being completely ignored, but he’s the clear outsider.

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Comparison to Current Market

Bookmakers currently have Rubaud 11/8 (47.1%) and Imperial Saint 2/1 (33.3%).

My odds give a more competitive race between Rubaud & Imperial Saint, factoring in Rubaud’s untested stamina.

Ashdale Bob at 11/2 is an appealing value pick—currently 13/2 with bookies but may trade bigger in-play if he’s held up.

I lengthen Boombawn and Mark Of Gold slightly as the pace setup doesn’t favour them.

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Final Thoughts

If I were laying the market on the exchange, I’d be happy to take Rubaud on below 6/4 due to stamina concerns.

Imperial Saint is the safest betting proposition.

Ashdale Bob is the best value option at 11/2+.

Likely market moves: Rubaud to drift slightly before the off; Ashdale Bob to shorten if money arrives from Irish punters.