At 1:51:34 the white pawn at g4 and the white rook at e7 acted as jailkeepers against the black king, allowing the white rook move from e1 to e6 to then cause checkmate. Often, as in this case, it takes 3 attacking chessmen to deliver checkmate. In this case the 3 attacking chessmen that caused checkmate were 1 pawn and 2 rooks.
At 1:51:34 the white pawn at g4 and the white rook at e7 acted as jailkeepers against the black king, allowing the white rook move from e1 to e6 to then cause checkmate.
Often, as in this case, it takes 3 attacking chessmen to deliver checkmate. In this case the 3 attacking chessmen that caused checkmate were 1 pawn and 2 rooks.