The rearranged Victor Chandler Chase, due to take place at Cheltenham on Saturday, has been reopened due to an insufficient number of entries.
Saved from Ascot's abandoned card last weekend, Nicky Henderson's Sprinter Sacre, the Paul Nicholls-trained Sanctuaire and last year's winner Somersby are all due to be running.
However, only seven entries were made by midday on Monday so the race has been reopened until 11am on Tuesday.
Officials believe the weather over the next couple of days will be crucial as to whether the Festival Trials meeting will go ahead. Although the course is raceable under the protective covers, it remains very cold and more snow is forecast before a hoped-for improvement in the second half of the week.
Clerk of the course Simon Claisse said on Monday: "The course remains raceable under the covers. The temperatures are below freezing and there is a just a touch of very light snow in the air.
"There is the chance we will get further light snow tomorrow with temperatures beginning to get better by Thursday/Friday and rain on Saturday. I think it is still very much in the balance at this stage.
"We will remove the covers when most of the snow has thawed and that is where we need the help of not too much more snow, and milder air by the end of the week.
"I think the next crucial stage in our thinking will be after we have had the snow that's forecast. I think we will have a pretty good idea as to the way it's heading on Wednesday morning."
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