user: Question: What is the sum of the game with a PWin% of —, Term [c] of 1987–1988, and Win% less than 0.506?
Columns: ['Name [b ]', 'Term [c ]', 'Games', 'Win%', 'PWin%']
Types: ['text', 'text', 'real', 'real', 'text']
Sample row: ['George "Red" Sullivan', '1967 – 1969', 150.0, 0.393, '—']
SQL:

assistant: SELECT SUM("Games") FROM "Table" WHERE "PWin%" = '—' AND "Term [c ]" = '1987–1988' AND "Win%" < 0.506;