From: Rabbi Moshe Sofer
To: Rabbi David Katz
A Kohen's wife gave birth two months after their wedding to a viable son; the husband claims relations occurred during their engagement yielding a nine-month pregnancy under shufra garim, but community members contest this timeline. The Chasam Sofer finds it difficult to actively permit the situation for a Kohen given challenges to the foundational leniency of Mahari Mintz, but ultimately adopts the Rivash's formulation that one who is lenient has a pillar to lean on, declining to mandate separation while personally reserving judgment.
Source: Shu"t Chasam Sofer EH I §7