This is a spread I use often for myself, and a lot with clients — especially when they're working through a problem or weighing a change, like a career move. It's a triangle of three points: one line of cards is the idea, one line is the problem, and the third line is the solution. The layout overlaps deliberately, so cards share roles: one card bridges the idea and the problem (part of what you're trying to accomplish, but also part of what's problematic), one belongs to both the idea and the solution, and one to both the solution and the problem. The cards tell that story across the points.
A worked example
The idea. I drew three major arcana — the Chariot, the World, and the Empress — which tells me the idea is important. The Chariot reads as work, and as control: holding the reins so everything moves in one ordained direction, the zodiac on his belt, the stars above. The World is culmination — looking back on what she's accomplished as she passes through the gate to the next thing — so this is something I have real expertise in, built on past experience. And the Empress is Venus: beauty and harmony. If you put nothing but beauty into the world, you tend to see beauty in the world. So the idea is about finding a genuinely harmonized, beautiful solution.
The problem. Again major arcana. The Chariot returns — being the director, the reign-holder — which might itself be part of the problem (timing, or whether my work is pointed that way). The Four of Wands is unusual in a problem position: fours are stability, wands are passion and career, so the problem may be that I have real stability and accolades in my current role, which makes it harder to switch directions. And the Devil — which I immediately read as lies, because addiction is a lie: the body convinced it needs something it doesn't, and that's not only substances but relationships, grievances, negative patterns. So I may be chained, not catastrophically, but to the earthly comforts of a successful role rather than the transcendent thing.
The solution. The Ten of Cups — real completion, hands thrown wide, happiness. Part of the solution is to embrace all of it: to recognize these are good problems, held in place by contentment and past success. Embrace that there'll be a knock to your stability and comfort; embrace that work is both the idea and the problem; embrace the beautiful, harmonized concept (Venus again — beauty in and beauty out); and embrace the World, the transformative passage through the gate.
Why I use it
My mentor — Vincent, rest in peace — is the one who, as far as I know, came up with this or at least passed it to me and many others. It's always been a good one for working through a multifaceted problem, sometimes one that hasn't even fully surfaced yet. This reading goes in my journal, dated to today — and today is Wednesday, which is Mercury, mindful energy — and I'll reference it many times as things play out.