Major League Baseball (National League) rules apply. This includes the rule that ONLY WOOD BATS are permitted.
(a) The bat shall be a smooth, round stick not more than 23/4 inches in diameter at the thickest part and not more than 42 inches in length. The bat shall be one piece of solid wood. NOTE: No laminated or experimental bats shall be uses in a professional game (either championship or exhibition game) until the manufacturer has secured approval from the Rules Committee of his design and methods of manufacture.
(b) Cupped Bats. An indentation in the end of the bat up to one inch in depth is permitted and may be no wider than two inches and no less than one inch in diameter. The indentation must be curved with no foreign substance added.
(c) The bat handle, for not more than 18 inches from its end, may be covered or treated with any material or substance to improve the grip. Any such material or substance, which extends past the 18 inch limitation, shall cause the bat to be removed from the game.
MLB Umpire Manual
2.5 BAT RESTRICTIONS AND MANUFACTURERS
See the annual bulletin regarding bat restrictions, trademark size, markings, colors and a list of approved manufacturers. All bats used in a Major League game must comply with these regulations as well as with Official Baseball Rule 1.10.
If a player uses or attempts to use (see section 2.7) a bat which does not conform with the specifications of rule 1.10 or with the restrictions set forth in the annual bulletin regarding approved bats, such infraction shall case the bat to be removed from the game. The player would not normally be declared out or ejected for using such bat unless, in the umpire’s judgment, such bat has been altered or tampered as described in Official Baseball Rule 6.06(d) (i.e., the distance or reaction factor has been affected).
SO let’s be clear:
(a) If anyone discovers an illegal bat, it must be replaced immediately, but no one is called out.
(b) If the illegal bat puts the ball into play before it is discovered, any and all outs that are made on the
play stand (including both sides of a double or triple play), but no other runners may advance as a result
of that bat’s use.
(c) If no out is made and then the illegal bat is discovered, all runners return and the batter gets up again
with a legal bat. (Yes, there are do-over’s in baseball.)
EXCEPTIONS TO Major League Rules
RE-ENTRY: Once per game a starting player removed from the game may re-enter in his same position in the batting order. His substitute will be removed from the game and may not return.
EXTRA HITTER: A team has the option of a 10 man batting order. A team must decide this before the game and it applies for the duration of the game. The EH may be placed into a defensive position.
VISITS TO MOUND: Pitchers removed because of the second visit in an inning may remain in the game at another position. They cannot return to the mound later in the game.
COURTESY RUNNERS: They are not permitted. The pitcher and catcher must run for themselves.
INJURY RULE: A team may begin a game with 8 legal players. If a player cannot finish the game, the team may continue with no fewer than 8. There will be no penalty. The missing player’s time at bat will not be an automatic out. If a team begins the game with a 10 man line-up and must continue with 9, they may do so without penalty. They simply skip that position in the line-up. If a player gets injured and the team has non-legal substitutes only, they MAY bring one of those players back into the game. If the opposing coach would like to choose which player is to return, he may do so. The player who has left the game because of injury may NOT return to the game; he is disqualified for the remainder of the game.
VIOLENT CONTACT: We do not have a must slide rule nor do we have a must avoid contact rule during a tag play at a base. However, if the fielder has possession of the baseball violent contact in an attempt to dislodge the ball is prohibited. The runner will be called out and may be ejected from the game (umpire discretion).
However: Since we are strict with runners who collide with fielders, we must prevent fielders from blocking a base (e.g., a catcher blocking the plate) without possession of the baseball. Therefore, “Fielders without possession of the ball will not be allowed to deny access to the base that a runner is attempting to achieve”.
Specific Rules for PeeWee Division (8U)
No player in the Peewee Division can turn 9 years-old prior to May 1, 2007.
No metal Cleats.
The runners may not lead off the base. If they leave early, they will be sent back to the base they came from or if the batter reaches base, they will be sent to the base to which they are forced-ONE BASE AHEAD OF THE BATTER-RUNNER. Runners may steal a base after the pitch has crossed home plate.
No stealing home: A player may inherit home plate on continuous play on a batted ball (NOT BUNTED) or by being forced in by a walk. There is no infield fly rule. The batter is out even if the third strike is not caught. Universal batting is optional. If a player leaves the game early and there is no player to replace that player, then there is no out recorded for the vacant spot in the lineup. Play is considered dead when the pitcher is in the vicinity of the pitcher’s mound and has possession of the ball.
Specific Rules for Cub Division (10U)
No player in the Cub Division can turn 11 years-old prior to May 1, 2005.
No metal cleats.
Common Rules for PeeWee and Cub Division
OFFICIAL GAME: The games are 6 innings in length. The game becomes official after the losing team has batted 4 times or 2 hours have elapsed.
TIME LIMIT: No inning may start after 2 hours have elapsed. Games will end in a tie. MERCY RULE: If a team that has batted 4 times is down by 10 or more runs, the game is over. However, if the visiting team opens up a 10 run lead in their half of the inning (5th inning or later) the home team must get their time at bat.
Specific Rules for Bantam Divisions (12U)
No player a BANTAM DIVISION can turn 13 years-old prior to May 1, 2003.
No metal Cleats.
Bases 75′ (If a site cannot accommodate 75′ bases, no less than 70′ is permitted)
Specific Rules for Grasshopper/Freshmen/Junior Divisions
No player in either Grasshopper Division can turn 15 years-old prior to May 1, 2001.
No player in the Freshmen Division can turn 17 years-old prior to May 1, 1999.
No player in the Junior Division can turn 19 years-old prior to May 1, 1997.
Mound 60′ 6″
Common Rules for Bantam, Grasshopper and Freshmen Divisions
OFFICIAL GAME: The games are 7 innings in length. The game becomes official after the losing team has batted 4 times or 2 hours have elapsed.
TIME LIMIT: No inning may start after 2 hours have elapsed. Games will end in a tie.
MERCY RULE: If a team that has batted 5 times is down by 10 or more runs the game is over. However, if the visiting team opens up a 10 run lead in their half of the inning (6th inning or later) the home team must get their time at bat.
ADVANCING TO THE CHAMPIONSHIP
POINT SYSTEM: A team will be awarded 2 points for a win. If a game ends in a tie (and pool play games can end in a tie) each team will be awarded 1 point. There are NO extra innings in pool play.
The point system will be used to determine position in the standings.
I Head-to-head competition. This applies when only 2 teams are tied and they played each other.
II Run Differential (12 run maximum for the purpose of this rule, no game can be decided by more than 12 runs). When 3 or more teams are tied we will use run differential to position the teams in the standings. We will not revert back to head-to-head competition unless teams have the same run differential.
A team that forfeits a game is NOT eligible for the playoffs. If all tied teams played the game against a team that forfeited, the run differential from those games will be included in the calculation. If all tied teams did not play their game against a team that forfeited, the forfeit score of 7-0 will be used in the calculation.
III Runs Allowed over-all.
IV Runs allowed vs common opponents.
V Runs scored overall.
VI Runs scored vs Common opponents.
VII Coin flip