"I fear not the man who has practiced 10.000 openings once, but I fear the man who has practiced one opening 10.000 times."
Club
Chess.com - Polska
50.249 membri
MARIANCZELLO CLUB
48.781 membri
Infoszach
7.812 membri
Polski Związek Szachowy
24.653 membri
Chess University - Poland
1.670 membri