Russian solitaire is Yukon with the difficulty turned all the way up. The layout is identical — every card dealt at the start, no stock pile, move any face-up group — but the tableau builds down in the same suit instead of alternating colours. A 7 of spades will only ever accept the 6 of spades.
With just one legal landing spot for every card, positions lock up fast and every choice matters. It is widely considered one of the hardest solitaires there is: winning even occasionally is a real achievement, and unlimited undo is less a convenience here than a survival tool.
Same-suit building means every card has exactly one card it can land on, instead of two in alternating-colour games. Half the flexibility disappears, so positions deadlock far more easily.
Only the building rule: Yukon builds down in alternating colours, Russian builds down in the same suit. Everything else — the deal, the group moves, the foundations — is identical.
Turning a face-down card over is worth 5 points and every card you send to a foundation is worth 10, plus a time bonus for finishing. The 5 points for a flip is the game telling you what actually matters: uncovering cards is the whole job, and a score that has stopped climbing means you have stopped digging.
No — a large share of deals are unwinnable even with perfect play. Treat every win as earned.