Goal buster

[obrijo]

Hello,
Its been a while and I hope someone can help. I have a fairly simple spreadsheet which is called Buster. It consists of various people who gamble on football teams scoring some goals or not each date they are playing. As soon as some one reaches 21 goals they win. However if they go over 21 goals they are bust(Hence Buster) and go back to 10 goals. I want to be able to flag when any player goes over 21, goes back to 10 and starts with 10 from that date on. In column C I have the Sum of goals scored. Rows 3-32. for each date.

[TABLE="width: 500"]
<tbody>[TR]
[TD][/TD]
[TD]John[/TD]
[TD]Column C[/TD]
[/TR]
[TR]
[TD]Date[/TD]
[TD]Team[/TD]
[TD]Gls[/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD]Row 3[/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD]Row 4[/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD]Row 5[/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
</tbody>[/TABLE]