In a situation where a batter hits a grand slam and a runner misses second base, how many runs score after a proper appeal?

In the scenario of a grand slam, typically four runs score because it involves the batter and three runners on base. However, if a runner misses touching second base and the opposing team makes a successful appeal, that specific run is negated. This means that even though the grand slam was hit and four runners originally reached home plate, the successful appeal for the missed base removes one of those runs, leaving a total of three runs that count.

Thus, after the appeal, three runs score—three because the runner who missed second base is not considered to have crossed home plate legally, even though the other runners did.