Wild Pitches and Passed Balls
When a pitch is thrown that is not caught by the catcher and a runner advances, it is scored as a wild pitch (WP) or passed ball (PB) as per scoring rule 10.13.
The difference comes down to whether or not the ball could have been handled with ordinary effort. If it could, then it’s a passed ball, otherwise a wild pitch. One specific hard and fast rule to use is that any pitch that hits the ground prior to getting to the catcher is always a wild pitch. Also note that a strike (swung at by the batter) may be a wild pitch. If there is a wild pitch or passed ball, but a runner is thrown out trying to advance, then no WP or PB will be scored, even if other runners advance. The others runners advance is deemed to be on a fielder’s choice.
Also note that if a runner was stealing on the pitch that ends up past the catcher, then no PB or WP will be charged (unless the runner advances more than one base).