Reserve Runners Vaal Race 7

Race 7 the Vaal.

Reserve runners, numbers 15 and 16 now make up the field. No runner's scratched except for the other reserve runner.

This meeting to my knowledge was moved this morning.

I thought reserve runners replaces any horse that was scratched the previous day by 08h00 or 11h00.

I know the Vaal can accommodate more runners than the inside course at Turffontein.

What rule got implemented for them to be accepted.