Last time out. Facing the suspension of Deandre Yedlin, Klinsmann flipped Fabian Johnson to the right and brought in Matt Besler as a left-back-type-substance. This looked weird on the surface. When soccer folk attempt to describe an overall tactical approach with a formation those formations are invariably symmetrical and identical in attack and on defense; neither of these things are true in practice. Besler barely ventured forward when the US had the ball; Fabian Johnson bombed up the right sideline all game. Both of these decisions were suited to their play, and the US played their best first half of the tournament. It was predictable but it put people in roles they were good at.

Things went nuts in the second half after red cards to each team. Jermaine Jones put a fist in the vicinity of an Ecuador player to even things up after Antonio Valencia got a second yellow card, turning what should have been a comfortable exercise in seeing out a game a man and a goal up into a frenetic finish. Klinsmann left Clint Dempsey on the field an inordinately long time, leaving the US with just seven guys trying to defend. This paid off with a goal, and then bit the US when Dempsey continued afterwards. Klinsmann also left on a number of US players on yellow cards and got his just desserts for doing so when an exhausted Alejandro Bedoya pulled an opponent back after getting beaten. He was issued a yellow that suspends him for this game. Steve Birnbaum would come on in the 93rd minute as a middle finger to common sense.

But they're here, in a semi-final against Argentina. This is an opportunity for history.

This dude 1) scores 2/3rds of a goal per game in the EPL, 2) comes off Argentina's bench

So… Argentina. The problem is that they're not just Messi. Throw a rock at the attacking players on Argentina's team and you will hit a cornerstone of one of the elite clubs in the world. A dude with 102 goals in 150 appearances for Manchester City comes off their bench. FIFA rankings blah blah blah; #1 does mean something.

After years of frustration they've finally figured out how to deploy Messi in the context of the national team: they tell him to do whatever he wants and try to run into useful places. Messi roams from sideline to sideline, from front to back, and is extremely difficult to mark out of a game as a result.

Their defense looks elite but is part a creation of their possession; they had a shaky period against Venezuela where the Rio Tinto outside backs were bombing forward and unsettling the D's organization. Venezuela hit a post, missed a penalty, and forced a couple excellent saves out of the Argentina keeper.

Argentina's back four is not to the standard of the rest of the team. They start Gabriel Mercado, a 29-year-old Liga MX player with just six caps, at one outside back spot. The other outside back spot is a Man U player who has trouble getting league appearances; Everton center back Ramio Funes Mori has been a bit iffy in this tournament. This is still Argentina we're talking about here but they're not overwhelming back to front like a Germany is. Those center backs are generally regarded as the weak links of the team, and a quick counter attack or successful overload could stake the US to a lead. Argentina is vulnerable to the kind of goals the US scored against Ecuador. The US can have a period of similar productivity, and maybe they have better luck.

Just one problem.

Wood is the man, and he's on the bench. Wood is a brutal loss since he's been maybe the USA's best player in this tournament not named John Brooks—he is capable of runs behind the defense and hold-up play, a complete forward the US hasn't seen since the brief moment when Charlie Davies was reaching his peak. While it came to little, Wood's tenacity and speed were most apparent on a run early in the Ecuador game that had no business turning into a shot but did nonetheless:

That is a guy who puts the fear of God into center backs.

Woods had two hockey assists in that game as his runs drove the opposition back to the mouth of their own goal and opened up space for crosses against a defense that had already spent a center back chasing him.* Davies was the last US forward to threaten like this. His activity became so integral to the USA's gameplan under Bob Bradley that Bradley not only brought but started Robbie Findley during the 2010 World Cup. Since Findley was a version of Davies with cement blocks for feet this was a mistake; it demonstrates just how dangerous and difficult to find a guy like Wood is for the US. (Except they've got another one playing in Seattle, but that's another post.)

Everyone assumes that the US will slide Zardes up top and try to get the same production. Zardes does match Wood's speed and endurance but Wood is super productive at finding space, something Zardes is erratic at. His first touch has been discussed to death for good reason; he's not likely to replicate Wood's production. The US is hoping he has a moment or two where it works out and he can apply his physical gifts. The other option is Chris Wondolowski, which: no.

*[Fancy talk for this is "running the channels." To execute this a center forward runs diagonally to the edge of the field, usually when the outside back is up the field. A center back generally gets pulled into an uncomfortable spot and the defense has to rotate to cover. Just like in basketball, a rotating defense is a vulnerable one. The second goal is a quintessential example of that activity.]

What now? Wood, Jones, and Bedoya are suspended for the semifinal.  Losing the two central midfielders at the same time is rough but survivable since there are reasonable replacements; losing Wood is probably fatal for the USA's chances in a game where they don't figure to have much of the ball.

I'm operating under the following assumptions:

• The US will continue using Dempsey as a second forward under a true #9
• They will not be averse to asymmetry in the formation
• Darlington Nagbe made fun of Klinsmann's hair

Klinsmann has gone with all the old guys for his substitutions so far, frustratingly. Continuing that would be a major mistake. The Argentina back line had a lot of trouble with Venezuela's outside speed. Beckerman has just about reached his expiration date. I'd rather roll with a more athletic player there.

I would stick with the unbalanced formation the US used against Ecuador and slide Fabian Johnson up. You're going to need a moment of brilliance or two and Johnson is one of the likeliest candidates to provide that if he's allowed to play on the wing. It could look like this:

You could flip Pusilic in for Zusi but the chances of that seem very low.

FWIW, this is the formation most of the USA internet has arrived at. It lets Yedlin fly up the wing like Fabian Johnson did in the previous game and puts Johnson back at the spot that he excelled in this season for Gladbach. With Argentina down Angel Di Maria and Nicholas Gaitan they don't have a ton of width. Their outside backs don't get forward much; they don't do a whole lot of crossing. They had only 12 in the Venezuela game, and one of those was the ridiculous Messi assist from 40 yards out. All this means the US would do well to replicate their gameplan against Spain in the Confederations Cup: load up the middle and clear the crosses.

The gameplan with Beckerman looks something like this:

Nagbe has been more effective in the center of midfield in the last couple years of MLS play but this would be more or less fine. Other exotic options include dumping Dempsey for a 100% bunker, bringing in DM Perry Kitchen, and deploying Pusilic. None of these seem at all likely, but Klinsmann might Klinsmann.

Nagbe is critical because he is the USA's best bet to relieve pressure and get more of the ball. His exclusion has been somewhat reasonable to date; leaving him out in this game means both Zusi and Beckerman are playing and means the US is playing to survive a 90 minute onslaught and hope for the best in penalties. Given the situation Nagbe is a better defensive player than Beckerman. He would not fare as well in a defensive mid role but he doesn't have to play it, and Nagbe is a huge upgrade in both athleticism and ability to possess the ball.

This tournament is already a success. It's hard to imagine that the continual changes in both personnel and formation will persist going forward. The back five are just about set. Wood and Dempsey are your first choice forward pairing. Jones, Bedoya, Zardes, and Nagbe will battle for midfield spots. There's one slot in the first-choice 11 that is up for grabs based on performance (Zardes) and two that may have to be revisited due to age or continued problems with red mist (Dempsey and Jones). For a team that didn't start the same center back pairing since the assassination of Franz Ferdinand until the run up to this tournament that's a quantum leap forward.

Most of the questions concern backup spots now and even a couple of those (Jordan Morris, for one) have reasonable answers going forward. Outside back, as always, is the main area of concern.

Klinsmann still behaves like a man who's petrified people will see through the emperor's new clothes and is replacement-level at best, but… hey, replacement level! I can dig that!