Fasting 10 Days?

With regard to fasting on the 10th of Dhul Hijjah i.e, day of ‘Eid , this is haram (prohibited), as is indicated by the marfoo’ hadeeth of Abu Sa’eed al-Khudri (may Allah be pleased with him):

“He [the Prophet (peace and blessings of Allah be upon him)] forbade fasting on the day of ‘Eid) al-Fitr and the day of al-Nahr (the day of sacrifice, i.e., ‘Eid al-Adha).”

(Narrated by al-Bukhari, no. 1992; Muslim, 827) 

The scholars are unanimously agreed that it is haram to fast on these days.

Righteous deeds on these ten days are better than on others. With regard to fasting, that should only be done on nine of them; the tenth day is the day of ‘Eid when it is haram to fast.

Based on this, what is meant by the virtue of fasting the ten days of Dhul-Hijjah is fasting nine days only, even though they are called ten days.

And Allah knows best.

Sharh Muslim by al-Nawawi, hadeeth no. 1176