Is this mate in 4 or in 2?

Alright, so I'm going through the tutorials in Chessmaster Grandmaster Edition, and this scenario is presented to me. As you can see, the tutorial claims white has checkmate in four moves - which isn't incorrect. It wants me to sortof walk the black king up to rank 8 with the two white rooks. But isn't there a better solution in two moves here? Couldn't you move the rook on B1 to G1, then black's only legal move would be king to H6, then you move the rook from A4 to H4 and it's checkmate, right?

Am I insane?? What am I missing here? Or is my solution perfectly viable, and Chessmaster just overlooked it or something?

Maybe it counted the opponent moves into the "4" so 1.b1 to g1, 2. H5 to h6, 3. A4 to h4 and 4. Checkmate?

No, it straight up told me moving the rook to G1 was incorrect. It would only let me do it the stair-step way to rank 8. Which might just be it Making A Point and reinforcing that you can do that stair-step thing, but it's frustrating nonetheless. Unless, as I said, I'm missing some reason why checkmating in the H file wouldn't work?

Rg1 is 100% correct. It's their fault for not making sure there really was only one solution, and not pointing out that alternative solutions are correct.

At least the lessons on this website acknowledge unintended correct answers. (And in this case, the solution they want would be an "alternative.")

This is just plain bad design. I'd get the hell off any website that does stuff like that.

This is a bizarre oversight by the guy who wrote that tutorial.

The simplest way to fix it would be to put the black king to g5. It's possible that it was the intention, and something went wrong in implementation.

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The mate in two is there as you, magipi and others noted, though I felt the author of the puzzle intended for the exercise to be an exercise of pushing two rooks to illustrate the lawnmower mate.

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The mate in two will not be present with the White king being on c1 instead.

Nah

Thanks to everyone who confirmed I wasn't just missing something, lol. Overall, I think the tutorials in this program (Chessmaster: Grandmaster Edition) seem quite good. Really odd little oversight here, but I'm glad it wasn't just me who saw it.

Yeah you're right. Must just be an exercise to teach ladder mate.