G40 and G41

[Chris is me]

This prevents strategies where teams collect balls from the neutral zone, then immediately shoot them over the defenses into the courtyard. With the single defender rule this could quickly create a semi-chokehold situation where one alliance controls most or all of the game pieces, effectively preventing the opposing alliance from scoring anything other than the game pieces they already have. In short, this rule puts a damper on starvation strategies.

G39 does cover some of these situations, but G40 and G41 help as well. Specifically, boulders could be moved across defenses without "launching" them, such as via being bull dozed, pushed, etc.

[maxnz]

G41 would prevent a team from parking themselves in the outer works, receiving balls from a robot or human player in the neutral zone and relaying them to a robot in the courtyard without leaving the outer works. This would satisfy G38 and G40-A and technically be allowed by G40-B because they did start in the neutral zone before the first boulder. G38 is satisfied if they only touch one boulder at any given instant, such as if they intake it and drop/get rid of it before getting the next boulder. G39 would be satisfied if they drop it and let it roll down the ramp into the courtyard using gravity.