Zack Britton’s most frustrating moment in baseball, brought the Yankees — and most of baseball — to this point. In October 2016, then an Oriole, Britton was not only the Orioles’ closer, he was the best reliever in baseball at the time. He’d converted 47 of 47 save opportunities and had not allowed an earned run since April.

And when the Orioles’ season ended in the American League Wild Card, he was still standing there in the Rogers Centre bullpen. He never threw a pitch.

“That was tough. Obviously, I wanted to help the team out in that situation. I think this bullpen’s a little different, obviously. I’m not closing games now, but I think that allows Aaron (Boone) to put me in the game a little earlier. But the game evolved, too,” Britton said last week. “I think ‘16 was kind of that year where managers didn’t want to leave one of their guys in the ‘pen.”

“Nowadays, getting the bullpen early is a thing, and it wasn’t quite there yet,” he continued. “It was the move that kind of maybe broke the ice for a lot of other managers to deploy the bullpen a lot earlier.”

The Yankees have chosen the less traditional route to try and win a World Series. After trying to land an ace this winter and instead bringing in a potential ace in James Paxton, they doubled down on building a super bullpen. At the trade deadline, while the rumors surrounding them focused on the potential of landing another starter, the front office was really making a bigger push to add an arm to an already stacked bullpen, an industry source said.

“The numbers and math is there,” one rival executive said. “The effectiveness of starters after the second time through the lineup drops. Having good relievers who can come out and throw hard and who have more than one pitch can really quiet an offense.

“The market has changed so much, this was a smart pivot if you buy in,” he said. “And the Yankees have certainly bought in.”

They are all in now.

After trading for Britton at last year’s trade deadline, they brought him back this season. They added Adam Ottavino to the mix and invested in improving Chad Green and Tommy Kahnle and then had Aroldis Chapman at the end to slam the door.

The Yankees have used them carefully this season. They were only ninth in the majors in innings pitched by relievers. The high-leverage guys like Chapman, Britton and Ottavino were never used on three consecutive days throughout the season and September they were rested with an eye toward being able to rely on them now.

Watching other playoff teams — like the Dodgers losing Game 5 of their division series by going to a starter in relief — the Yankees know they are a different animal.

“Obviously everyone’s a little bit different. We feel like one of the strengths of our team is our 12 or 13 pitchers as a whole,” Yankees manager Aaron Boone. “We may deploy them a little bit differently... But part of the way we’re built is not just having a few high-end relievers that we count on obviously, but a depth of relievers that we feel very good about that we can kind of navigate a game if we get starters that give us quality, even if it’s a little bit shorter.”

The Yankees’ bullpen understands that they have a bigger role than the traditional relievers.

“They’ve been going to the bullpen in an aggressive way (in the playoffs) and for us it’s just we have to be ready for whatever comes our way,” Chapman said through an interpreter. “Of course it changes a little bit because you find yourself in the middle of the playoffs, and in any given situation in the playoffs you can end up in a tight game. You want to stay away from a mistake and execute and do your job. So the concentration has to be there a hundred percent. Things can go either way, so for us it’s about being ready.”

Boone said Thursday it’s a tool he has become more and more comfortable with over the last two years.

“I kind of go into the game and go into series and try and have a blueprint or a plan in place that obviously is always fluid, and you’ve got to make adjustments on the fly,” Boone said. But just trying to do whatever to — what’s going to give us the best chance to win.”

Boone said that his comfort with it has grown the same as baseball and it probably was examined after Britton’s frustrating end to 2016.

“It started the conversation throughout baseball,” Boone admitted. “Like the Rays bringing the opener into the conversation. We’re able to look at the benefits of deploying our pitching in different ways.”