Some challenges can be played by ROBOTS OR AI ONLY

MM said in a few other threads that he passed it on, so while it's being looked at (or not), these games are actually relatively easy to beat if you stick to the method I've been using ever since the third AI game in the weekend challenge, and World Class in Football Centre Key Matches got ridiculously hard.
I usually win on the first try, sometimes the second, and I hardly ever have to rage kill the app, so I don't waste gems for a crappy reward so this is a bit of a guide that might also help you get better at H2H.

I find that formations with two CDMs seem to work the best, and I've been mostly using 4 2 3 1 Narrow, which has two CDMs and three CAMs. The side CAMs usually play as wingers when you attack.

- Do not change mode to defend or attack, keep it balanced. 

- Possession is the key. Drag the AI into your half to charge at your players and then pass it as if you were going to counter, but do not sprint or use skill moves. Let the player on either wing walk up towards the AI penalty box, keep an eye on your striker and two CAMs around the half circle, and if there is a gap, swipe shoot. Many of these shots will be saved, especially Koller in this event, who has been highly irritating, but he does let a few in. If you have no clear shot, keep passing it around, the AI typically chases the ball enough to open up the gap.

- If the AI has a corner and your wing back is quick, try to head it out and pass to the LB or RB that is in an attacking spot. It’s the only time you can try running all the way for a goal as chances are the AI centre back won’t catch you.

- As soon as you score a second goal by playing the methodical buildup and you’re in the lead, don’t try to score a third. It ends badly most of the time. Just pass it around in the AI's half, it typically forces their attack and midfield to park the bus, so you can waste time by just holding the ball. If you step into your half, the AI starts rushing, so it’s crucial to maintain ball possession on their side where AI thinks you are attacking while you are not.

Yes, it’s boring, but it’s pretty effective, and sometimes these minimal shards might let you grab a better card without pissing away hard earned coins (or if you cannot get fodder from the market because your coin balance is low).