What are the major changes in the January 2010 Revision of the Official WAKA Rules?

The most significant change to game play is that the infractions formerly known as Fielder Encroachment, Catcher Encroachment, and the Pitcher Position Infraction have been consolidated into a single “Fielder Position Infraction.” Instead of a separate team warning and penalty for each type of infraction, the three types are now grouped together. A team will receive one Position warning for its first Position infraction of any kind, and all subsequent Position infractions of any kind will result in a free base to the kicker.

The rest of this revision mainly features clarifications and simplifications of language, such as that governing “bouncy” pitches (12.02) and the Extra Base (1.06). For a full account of changes, see the 2010 WAKA Rule Changes Guide.