In three seasons of “Married at First Sight,” the reality show matched nine pairs of strangers to meet at the altar and wed, but only two of those couples remain together today. So for Season 4, premiering Tuesday (8 p.m. on FYI), the show is calling in reinforcements.

New matchmaking specialists — relationship expert Rachel DeAlto and marriage counselor and pastor Calvin Roberson — are joining the sole returning expert, sociologist Pepper Schwartz, in an attempt to improve the show’s track record with six new singles in Miami. As for what’s been dooming the marriages since Season 1, Schwartz sees two main factors at fault.

First, she says the experts couldn’t predict how individuals would react under the pressure of an arranged marriage — pressure that in some cases revealed hidden character traits. (One could see Season 2’s Ryan De Nino and his temper falling into this category.)