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81A--
From my (admittedly untrained) viewpoint:
Against Cal, UCLA played a lot of a "flat" 2-3 zone, intended to deny entry passes to the post by dropping the 2 defenders almost into the lane and daring Boyd, Pierre and Jemerigbe to shoot from the wing. It also denied Clarendon her favorite spot, the corner 3. In the quarter, Jemerigbe was able to hit from the wing. Against UCLA, she was ice cold.
Against us, I think they realized that for the most part, Stanford's perimeter players are hesitant to launch immediately on receiving the ball (with the notable exception of Bonnie and to a lesser extent Sara). Also, Chiney is almost always operating solo inside (four out on the perimeter, including the other post). What that means to me is that the Bruins were able to maintain pressure on the ball and the two adjacent perimeter players, while leaving two players down low, one directly on Chiney and the other ready to go to her inside shoulder. There is an open player for Stanford, but to reach her means a long and dangerous pass from one side to the opposite corner. (It's really hard to describe this without the diagrams I see in my head).
Think of it this way - with Stanford's perimeter players being hesitant to drive (everyone except Amber, really) and mostly hesitant to shoot, three perimeter defenders can press HARD against 4 perimeter passers by bodying up against the ball and the two adjacent perimeter players. The fifth defender maintains constant contact with Chiney, and the fourth can float in the lane. If Stanford tries to reverse the ball, that hesitation allows either the perimeter defense to shift, or the fourth defender to rotate out while the opposite perimeter defender drops in as Chiney crosses the lane to set up on the opposite post. Also, as the ball moves around Stanford's perimeter it tends to stop at each "station", as each defender tries to determine if she has an opening into Chiney, rather than "whipping" around the perimeter. That slight hesitation also encourages those adjacent defenders to get in the passing lane and force the passes to move even further outside, or leads to tipped balls.
It takes some key parts to work - length and quickness on the perimeter (if our tall perimeter can see/pass over you, ball pressure becomes harder to maintain), and an inside defender whom Chiney can't simply overwhelm going to the baseline or straight up, rather than across the lane. (It helps if the ref don't call bodychecks as Chiney spins and goes up; I love how she spins, goes up and ends up 2 feet further under the backboard then she started while the defender only "maintained verticality").
Normally, there are two ways to punish defenses that press hard on the perimeter - drive past them, or back-cut them. The problem is, Chiney (and her two defenders) are waiting in the lane. And a dangerous backcut really calls for a "cutter" type player, who is both dangerous on the perimeter and quick enough to create separation from an overcommitted defender with the backcut, rather than Stanford's compliment of tall but not very quick perimeter passers. The most natural target for backcuts would be Amber (although they don't often overcommit on her outside shot), and they tried yesterday to get that working a bit, but the defenders UCLA had on her (Williams, especially) were really quick; she never could get enough of a step to open up a clear passing angle.
The other way, which seemed to be Stanford's play in the second part of the second half yesterday, was to pull Chiney and her primary defender away from the basket. That pulls both the primary and to a certain extent that secondary defender away, spreading the floor. But spreading the floor only works if you've got players willing to cut and drive into the creases it opens up. Amber was willing, and Sara is willing if not as able to get a good look. But very few other players in Stanford's rotation are willing to put the ball on the floor, quick enough to get an angle on their defender and confident enough to finish solidly at the hoop. And also able to deal with the propensity I mentioned to favor the charge call over the block (again, I really love how defenders who are still and being driven past at an angle collapse at the slightest touch and often get the call).
One other mode of attack is the high pick and roll, again, pulling Chiney away from the basket. Amber did that well yesterday, too; when Chiney's defender didn't hedge and Amber's defender dropped under the pick, she pulled up for the 14-footer.
More generally, Stanford's measured, controlled pace on offense tends to not punish defenses for overcommitting, whether on the full court press, the half court trap, or ball pressure on the perimeter. The constant reassessment (Can I feed Chiney? If not, then do I have a shot? If not, then pass...) of Stanford's halfcourt offense enables defenses to close gaps and recover without ever really feeling that threatened.
I'm sorry if I'm not explaining it more clearly; don't have the technical coaching language. And there's a lot more to it, both in terms of positioning, specific match-ups (having Bonnie opposite corner as Chiney works across the lane helps out, preventing the offside perimeter from dropping in, e.g)
VG