Table: portsmouth_fc_1991_92
Columns: opposing_team
against
date
venue
round

Question: What is the date of the 2nd round 2nd leg?
SQL: SELECT "date" FROM portsmouth_fc_1991_92 WHERE "round" = '2nd round 2nd leg'

Question: What is the Round against Gillingham with an Against smaller than 3?
SQL: SELECT "round" FROM portsmouth_fc_1991_92 WHERE "opposing_team" = 'gillingham' AND "against" < 3