Six more top riders — including Lucinda Fredericks — have signed up to take part in the new Express Eventing International Cup.

The new eventing series — designed to condense the excitement of three-day eventing into a few hours, indoors —makes its debut in Cardiff’s Millennium Stadium on 30 November.

Twenty riders will take part in the competition, which has a prize-fund of £250,000, with £100,000 to the winner on the day.

British rider Lucy Wiegersma, Australian Olympic silver medallist Lucinda Fredericks, French eventer Rodolphe Scherer, Italy’s Vittoria Pannizon, New Zealander Caroline Powell and American Philip Dutton have all signed up for the competition in the past week.

Riders previously confirmed include Mary King, William Fox-Pitt, Andrew Nicholson, Clayton Fredericks, Belgian rider Karin Donckers and German Dirk Schrade.

The competition will start with a freestyle dressage programme, set to music, where riders will be judged on “artistic interpretation”.

They will then enter a combined jumping stage, with quick break to change tack between the show jumping and cross-country phases, still in the indoor arena.

For more information about Express Eventing International Cup, go to www.eeicup.com