CREATE TABLE table_69972 ("Name [b ]" TEXT, "Term [c ]" TEXT, "Games" FLOAT, "Win%" FLOAT, "PWin%" TEXT)

What is the sum of the game with a PWin% of , Term [c] of 1987 1988, and Win% less than 0.506?
SELECT SUM("Games") FROM table_69972 WHERE "PWin%" = '—' AND "Term [c ]" = '1987–1988' AND "Win%" < '0.506'
SELECT SUM("Games") FROM "table_69972" WHERE "PWin%" = '—' AND "Term [c ]" = '1987–1988' AND "Win%" < '0.506'