Answer:
(Fatwa: 19026/1794=D/1429)
According to the Hanfi Fiqh, there is no salah having single rakah, so the Hanfi followers will have to re-perform the salah. If the Imam had stood for the third rakah after having sat at two rakah, then there are only two rakah of qaza to be compulsorily performed, otherwise if he had not sat at the two rakah, then there are four rakah of qaza (two by two) to be performed necessarily.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
