SELECT SUM("Games lost") FROM table_45710 WHERE "Points against" = '61' AND "Points difference" < '42'
Which Games lost has Points against of 61, and Points difference smaller than 42?
CREATE TABLE table_45710 (
    "Year" real,
    "Games played" real,
    "Games won" real,
    "Games drawn" real,
    "Games lost" real,
    "Points for" real,
    "Points against" real,
    "Points difference" real,
    "Bonus points" real,
    "Table points" real
)