[PeterisP]

IMHO that's not chess anymore, as that explicitly violates the rules of the chess - if you manage to get an advantage by distracting your opponent and obscuring line of sight to the pieces, that's simply violating the laws of chess (specifically, FIDE "12.6 It is forbidden to distract or annoy the opponent in any manner whatsoever.") and appropriately punishable by the arbiters.

Chess is a well-defined, strict game not only from the "on-board" perspective but also regarding how the opponents can behave - e.g. it's explicitly specified that if your phone makes a sound during a match, then you lose the game; the rules of chess IMHO are exactly a sterile, well-known, controlled environment, and attempting to transform it to a novel, potentially adversial environment would generally be a violation of both the spirit and letter of laws of chess.

E.g. https://en.m.wikipedia.org/wiki/Chess_boxing is a fine physical, adversarial form of sports, but it's not chess.

[breck]

Haha, thank you! I stand corrected. (Next time I play with my nieces and nephews, I'm going to be stricter about rules :) )

[PeterisP]

Hah, I have a niece that will assert that I violate that "forbidden to annoy opponent" rule because I annoy her simply by existing.