The Blackhawks' are 21-0-3 at the moment, which sounds great. (And on one level is remarkable.) But, you see, the National Hockey League changed it rules a few years back, and if you tie a game during regulation play and therefore go into overtime -- then you automatically get a point. If you lose that game in overtime...it doesn't count as a loss! All that happens is that the winning team gets an extra point.
The Blackhawks have actually lost three games. But they don't count as losses. That's why you don't see a loss on their record. Even though they have actually lost three games.
So, it's a very nice record to have, just not quite as impressive as it sounds.
What is impressive is that out of a possible 46 point this season, the Blackhawks have accumulated 43. That is impressive.
But being 21-0-3 when you've actually lost three games. Less so.