Defence Forcingleft pack
 1 Force ballhandlers to dribble with their left hand, shrink the floor by gapping on both sides of the ball.
See Defences  Forcing left basics, Gap basics.
Force left by splitting the right shoulder or right foot.
If 2 has the ball,
 X2 forces left and takes away a pass to 5's left hand  X1 gaps left  X4 and X3 split the floor in "sight" (help) positions (a weakside "i")  X5 defends 5 in the low post 3/4 high side, taking away a pass to 5's right hand.
Gap defender X1 helps and recovers if 2 beats X2 to the middle, X4 helps the helper by stunting at 1 on the pass, then recovers to 4. 
 2 Guard the post "3/4 to behind"  on a post entry, X5 jumps behind on air time, gaps off, and forces left, taking away baseline.
Perimeter players choke on the post, then can dig (up) with one hand on a dribble (except if guarding a shooter), and recover if the dribble is picked up.X3 is weakside help.
If 5 gets the ball close to the baseline, X5 takes away middle, forcing baseline, X3 is the help (see below).
Variations
 just play behind the post, e.g. if X5 is long, or with the FIBA key, or to doubleteam  front the post (early), e.g. if she has a foot in the paint  3/4 low side if the ball is in the corner (be closer to the post line). 
 3 If 1 has the ball, X1 forces left, X2 and X4 gap, X5 denies 5, X3 is in a help position. 
 4 If 4 has the ball, X4 forces left (toward the sideline), X1 and X3 gap, X2 is in help. 
 5 Here 3 has the ball and 5 is ballside.
X4 gaps, X3 forces left and takes away a pass to 5`s top (left) hand.
X5 does not have to help on a baseline drive, but can help and recover if ballside.
X5 can play 3/4 high side (shown), or front and call "early", in either case X2 is help on the post. If X5 plays on the low side, 5 could duck in on a pass back to 4.
X1 and X2 form a weakside "i", X2 is ballside to help on a baseline drive, or on a lob pass if X5 is fronting. 
 6 Here 5 made an early icut to the elbow to get out of the way on a baseline drive.
On a baseline drive by 3, offensively 2 drifts to the weakside corner, 4 fills behind the drive, and 1 gets to 45 degrees on the weakside.
Defensively, X2 rotates to cut off the drive, X1 sinks to ball level (cover downs), helping the helper by taking away a pass to 2, X4 rotates to the top of the i. When X2 calls "switch", X3 peels off to the find the open attacker in X4's direction, here 4 filling behind the drive (a fourman rotation).
All defenders are matched up.
Variation  X3 stays to doubleteam 3 if he is long enough to influence a pass. 
 7 Defensive rotations are the same if 5 is weakside, X2 cuts off the drive, X1 covers down, X4 rotates to the top of the "i", X3 peels off.

 8 On a post entry, X5 gets behind, gaps and forces left (taking away middle), perimeter players choke then dig if 5 dribbles.
X2 is the help if 5 drives baseline, X1 sinks.

 9 On a pass out, X5 stays with 5 and X2 has leftovers.
Help rotation is the same if X5 fronts the post (X5 would pivot on the top foot to get behind and take away middle).

