CREATE TABLE table_20079931_4 (round VARCHAR, circuit_location VARCHAR, pole_position VARCHAR)

How many rounds were there in Karlskoga Motorstadion with Roger Eriksson at the pole position?
SELECT COUNT(round) FROM table_20079931_4 WHERE circuit_location = "Karlskoga Motorstadion" AND pole_position = "Roger Eriksson"
SELECT COUNT("round") FROM "table_20079931_4" WHERE "Karlskoga Motorstadion" = "circuit_location" AND "Roger Eriksson" = "pole_position"