Here are two helpful decriptions of the DP/Flex rule and how it can be used
http://www.fastsports.com/tips/tip25/index.shtml
and from NFHS
DP/FLEX RULE
It is believed that many coaches and umpires still may not completely understand the DP/FLEX rule (3-3-6) since it was passed in 2004. The committee felt another ?refresher? would be appropriate to more fully understand and utilize all the options available with the rule. The DP/FLEX rule was originally adopted because it provides more participation opportunities for student-athletes and more flexibility to coaches.
A. For Coaches ? Basic Rules to Remember. Keep these basic rules in mind:
1. Decide the 10 players you want to be designated as starters: 1) list the nine players you want to have in the batting order on lines 1 through 9; 2) list the name of the remaining player (FLEX) on the 10th line.
2. Fill in the defensive positions and list the player not initially playing defense as the DP.
3. When making lineup changes:
a. The DP cannot play defense only and the FLEX cannot play offense only.
b. When the DP spot in the batting order comes up, either the DP, FLEX or their legal substitutes must bat or run the bases. It is the only offensive spot the DP or FLEX player may hold.
c. The DP can replace anyone on defense any time, any number of times while the FLEX player may replace the DP any time, any number of times.
d. When any of the first nine players listed on the card leaves the batting order, she has left the game and when the FLEX player leaves the game on defense, she has left the game.
B. For Coaches ? Basic Utilization Strategies. The following are two basic strategies a coach might utilize to match the skills of the DP and FLEX players to complement one another. Further examples can be found on the NFHS Web site (
www.nfhs.org).
1. Objective: to utilize a fast runner who is a weak hitter (FLEX) to run for the solid hitting DP.
a. Matchup: assuming your pitcher can hit for herself, pair up an solid hitter (DP) with a player of exceptional speed but who is a weak hitter (FLEX).
b. Typical sequence: DP hits safely; FLEX enters to run for her; DP re-enters and hits safely; FLEX enters to run for her; sub #1 hits for DP (since the DP already used her one re-entry), FLEX enters to run for sub #1; sub #1 re-enters and hits safely; FLEX enters to run for sub #1; sub #2 hits safely; FLEX enters to run for her; and so on.
2. Objective: list a power hitter as the FLEX player when you have a platoon of players who will be the DP?s.
a. Matchup: assuming your pitcher can hit for herself, pair up an average player (DP) with a good hitting, but slow runner (FLEX) who also plays defense. Also used for a good hitting pitcher (FLEX) who you do not want running the bases unnecessarily.
b. Typical sequence: as the spot in the batting order comes up, enter the FLEX who hits safely; re-enter the DP to run; enter the FLEX who hits safely; sub #1 enters to run (since the DP already used her one re-entry); enter the FLEX who hits safely; sub #1 re-enters to run; FLEX hits safely; sub #2 enters to run; and so on.