With the MLB playoffs under way Tuesday, here’s a look at the format and some of the rules changes that will stay in effect — and those that won’t:

The rosters will remain at 28 players throughout the postseason. Initially, rosters were going to go from 30 to 28 and then to 26 for the final six weeks of the regular season, but with several teams impacted by COVID-19 cases, MLB changed course during the season and kept rosters at 28.

The three-batter minimum for pitchers will also still be in play for the postseason. MLB planned for that rule to go into effect even before COVID in an attempt to deal with pace of play to limit pitching changes, but it’s hardly made a difference.

Both leagues will also use the DH in the playoffs.

One rule that will not carry over to the playoffs is the runner on second base to start extra innings, which was- not surprisingly- extremely unpopular- with relief pitchers.

In terms of scheduling, unlike in previous postseasons, there will be no travel days during series, which will force teams to use more of their pitching staffs.

The best-of-three Wild Card Series will be played entirely at the higher-seeded team’s home ballpark.

Following that round, teams will enter a postseason bubble in one of several locations.

The two ALDS will be played at Dodger Stadium in Los Angeles and Petco Park in San Diego, while the NLDS will be split up in Texas between Globe Life Field in Arlington and Minute Maid Park in Houston. Those series remain best-of-five and the series in Texas may have fans in attendance.

The best-of-seven ALCS is scheduled for Petco Park, while the NLCS will be at Globe Life Field.

Finally, the World Series is scheduled for Globe Life Field in Arlington, beginning on Oct. 20, with up to two off days built in.