How accurate are HBS's polls?

ELECTIONHBS POLLACTUAL RESULT
2023-05-28 Cumhurbaşkanlığı 2. Tur
Erdoğan: 52.3%
Kılıçdaroğlu: 47.7%
Erdoğan: 52.18%
Kılıçdaroğlu: 47.82%
2023-05-14 Cumhurbaşkanlığı 1. Tur
Erdoğan: 47.5%
Kılıçdaroğlu: 47%
Oğan: 2.2%
Erdoğan: 49.52%
Kılıçdaroğlu: 44.88%
Oğan: 5.17%
2023-05-14 Genel Seçim
Cumhur: 45.1%
Millet: 40.5%
Emek: 10.4%
Cumhur: 49.49%
Millet: 35.04%
Emek: 10.55%