Mainshock · Chepstow 17:45

Published 29 August 2026 · Updated 29 August 2026 · HorseWhale

At 08:21 on 29 August 2026, 21 bookmakers cut Mainshock from 17/2 to 7/2 in the 17:45 at Chepstow. At the time of the alert, 12/1 was still available at Hollywood Bets, 10 Bet, BetWright and Dragon Bet. The race returned an SP of 3.75, making the alert price +247% better than SP, or +19.0 probability points. It finished 3 of 5, beaten 11.25 lengths.

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Flat

Mainshock

Chepstow · 17:45 · 5 runners · Other

THE MOVE

17/2 → 7/2

Still 17/2 at 4 firms when alerted
Hollywood Bets · 10 Bet · BetWright · Dragon Bet

21 firms had already cut to 7/2 when alerted

Risks

• Unproven at 7f. 0 previous runs at this trip.

RESULT
LOST · finished 3
Alert price: 12/1 (13.00)
SP: 3.75
Beat SP: Yes
+247% better than SP · +19.0 probability points

Fired 08:21, 29 Aug 2026

What this record shows

This is a permanent HorseWhale record of a qualifying market-movement alert. It records the observed event and what happened next; it is not a recommendation or a prediction of the race result.

Alert recorded

08:21 on 29 August 2026

Horse and race

Mainshock · Chepstow · 17:45

Observed move

17/2 → 7/2

Qualifying bookmaker movement

21 bookmakers had cut when alerted

Earlier price still recorded

12/1 at Hollywood Bets · 10 Bet · BetWright · Dragon Bet

Context at the time

Risks

• Unproven at 7f. 0 previous runs at this trip.

Outcome and grade

LOST · SP: 3.75 · Beat SP: Yes

A recorded price cut does not identify individual bettors, bet size, bookmaker liabilities or the reason for the move. A horse can have a recorded move and still lose.

Mainshock · Chepstow 17:45

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