How it works
The market settles on the conceded column only: a 0:0 draw and a 4:0 win are both clean sheets for the home side. Any clean sheet by either team automatically makes BTTS a «no».
What it tells you
Clean sheet frequency is the standard quick read of defensive strength — goalkeepers and defences are often ranked by it. Combine it with goals conceded per match: a side can keep few clean sheets yet concede little overall.
On ScanGoal
Check the conceded numbers in the form column: a row of zeros against a team over recent matches is the clean-sheet habit made visible.