Questions & Answers about Ich obrona jest silna, więc trudno strzelać bramki.
Here ich means their:
- ich obrona = their defense
This is one of the Polish possessive forms that does not change its ending. Compare:
- ich obrona = their defense
- ich trener = their coach
- ich drużyna = their team
So unlike mój / moja / moje or twój / twoja / twoje, the form ich stays the same.
Also, ich can mean them in other contexts, but here it is clearly possessive because it comes before a noun: ich obrona.