I know it looks like it's supposed to be a 45 but when I cut both boards at 22.5 they didn't line up. I usually just keep tweaking the miter saw until I get it right but I want to do it quicker and easier.
Not really my thing, but it looks like one could even lay a board on the ground and use the concrete control joint as a guide. Mark it, take it to the saw, swing the blade to match it up.
Or how about this: lay all the boards on one side of the steps. Use a vertical laser level to line up your straight edge to mark 'em all. (Make sure the beam lines up with the control joint and the top corner.)
Each joint will be a different collaboration to get to the 45 degree angle. Since the out lying point is off the point of the deck it will drift one way or the other. So it could start out 23/22 then go to 21/24 and so on... Finding common ground from the starting corner and scribing a line out to the edge of the board between the 2 stringers may help.
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