[AndyBare]

Actually here's a twist that's absolutely in allowance with G21.

Sit fully in the courtyard, and have the 15" extension reaching into the secret passage.

G21 A ROBOT contacting carpet in the opponent’s SECRET PASSAGE may not contact opposing ROBOTS.
Violation: TECH FOUL

However, if only your extension is inside the passage, you aren't touching the carpet of the secret passage. At this point, if an opposing bot accidentally pushed you into their passage, they'd actually be fouled with a G11 for strategically trying to draw a foul (this is because they would have made you foul a G21 when it wasn't your intent)

You'd also be allowed to shoot, because the only carpet you're touching is the courtyard carpet.

This is genius. Pretty much another safe spot - They'd have to squeeze behind you and the guardrail in order to push you away from the secret passage.