3.9.2: no piece can be moved if that exposes or leaves its own king in check.

That's a consequence of not being allowed to put yourself in check (by any means).

The only way to put yourself in check is by moving.

yifanl 32 minutes ago | parent | next [-]

The only action you can ever take in chess is moving.

333c 40 minutes ago | parent | prev [-]

Did you mean putting your opponent in check? In chess, you are not allowed to put yourself in check.

	▲	anamexis 23 minutes ago \| parent [-]
		You said “ That's a consequence of not being allowed to put yourself in check (by any means).” My point is that there are no other means.