My fiancée is all-in on the Bruins this year after she started watching the playoffs with me last year, just hooked on hockey. So we've been watching all the games and she's a VERY thorough researcher when she's interested in something. I keep telling her how funny it is that she chose such a frustrating season to get into the Bruins, but hey I have someone to watch with.
Anyway, we watch a lot of X's and O's videos. If you listen to Sacco at all, especially when he was just starting, two words keep coming up with regard to defense: "details" and "layers".
Details is kind of a catch-all for a lot of things, but on defense the noticeable one is their stick placement. They've gotten very, very good at using their sticks to
protect the slot and break up dangerous passes. The most recent games are great examples of this, where they prevent anything going through the middle of the ice. Even when the other team has a long possession in our zone, the only lanes open are passes around the periphery and they inevitably have to settle for a low-percentage shot.
Layers is about forward help on the transition, and the way handoffs happen into our hybrid D-zone structure. Essentially, this comes down to
forward help. In the neutral zone, you'll see our wingers force the puck into the boards and battle to try and get the puck going the other way. Someone said to just watch Geekie in the neutral zone and that's honestly a pretty good shorthand.
If they get it through the neutral zone, the Bruins D-men are way less than willing to give up a free entry. Under Sacco, they step up and challenge at the blue line to force a reset, or a dump, or just keep it on the perimeter. This is because a forward (usually the C) comes back and picks up the free man, establishing a "second layer."
Under Montgomery, challenging the blue line wasn't happening consistently. For example, here's a 5v5 transition goal we gave up vs. Dallas.
View: https://youtu.be/zTPTgfgOD94?si=nHaqOo9tpLrtWN9x&t=202
The forwards are late coming back off a lost puck battle and you can see the D pair sorting out what to do about the 3v2.
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Wotherspoon is going to take the open man coming up the right side. If a huffing Koepke (or Beecher, who slips) is more with this play, Peeke can step up and challenge the puck at the blue line knowing his forward will drop back behind him to pick up #27. Instead, he has to give up to the blue line to keep everything in front of him for an easy Dallas entry. The forwards are behind the play and we give up a pass to the slot that leads to a goal because we don't have time to set up.
Contrast that with this play vs. Washington:
View: https://youtu.be/p5KybIHTTRU?si=f5zJXw7Dsyk7WL-9&t=183
Even with the stretch pass, Zadorov can step up and challenge the puck carrier as he enters the zone because Zacha is in position to wrap behind and take the open man. They're forced to the outside and settle for a nothing shot to get an O-zone faceoff.
From that same game, here's a Dallas PP entry:
View: https://youtu.be/zTPTgfgOD94?si=BYlPUdm1S-Y60Lm_&t=329
McAvoy should be stepping up to challenge the puck with a forward dropping behind with Zacha coming around behind him to protect the pass and help. Hampus should then pick up the puck when it gets low, but he can't do that because Koepke is pretty much out of the play. So they give up a pretty easy cross to Duchene for effectively a back-door goal.
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I'm not a coach or anything, so I can't say for sure if that's more on Zacha or Koepke... maybe Zacha was supposed to let Hampus rotate while Koepke swoops in behind. But, essentially, Koepke is where McAvoy should be if he challenges.
Contrast that with this PP entry from the Washington game:
View: https://youtu.be/p5KybIHTTRU?si=nJmizNcQvSK-8LOT&t=52
Here, Peeke can step up to challenge the puck carrier and Wotherspoon can pick up the play low. Zacha's in pretty much the same place to defend the pass (which makes me think he was correct v. Dallas). The difference is Elias is on the other side of the ice to swap in for Wotherspoon.
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Washington is unable to develop down low and settles for a pretty routine shot from the faceoff circle.
Now, this is not really a different system than Monty's. But maybe the message to the forwards has changed from "win your O zone battles" to "get back to help first and foremost." Or maybe the newer faces have a better understanding of how the responsibilities shift as the play develops. And a huge caveat that I'm not a coach, am just pulling from the highlights of games I remember, and my hockey experience is squirts and a season of intramural in college. We did win, though.
Would love to learn more if anyone's more knowledgeable!