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In this market SportingIndex predict how many points one team will beat the other by.
This gives you the opportunity to support or oppose either team in any given match.
So, SportingIndex might predict that England will beat France by 7-10 points. If you fancied England to beat France by a margin of more than 10 points you would bet high at 10 for the stake of your choice, in this case say £5 per point.
If it turned out to be a tight match, with England scraping home 11-6, the supremacy (winning margin) would be just 5 points. As a result you would have lost 5 times your stake: (5 - 10) x your stake = -5 x £5 = -£25. However, if England had romped home to win by 20 points you would have won 10 times your stake: (20 - 10) x your stake = 10 x £5 = £50.