Alexander Grischuk (Black) Puzzle: Fork — Queen Check Fork
A queen fork becomes especially powerful when it arrives with check. The checked king must respond immediately, giving the attacking queen time to collect a second target. In this position, White’s advanced knight and exposed king create exactly that geometry: a forcing queen intrusion checks the king while attacking the knight. The result is a decisive material gain, even though White also has an advanced passed pawn and active tactical ideas of its own.