(Note: my answer below is not clear and not quite correct. It is also out of date--the rules have been renumbered and it should now refer to rule #2. Please disregard this answer and see the full rules and subsequent discussion above.)
Okay, I see that I need to clarify this rule. To answer each of your scenarios:
By rule #1, each move of a two-move turn must be individually legal for the position on the board at that moment--it does not matter whether a second move could remove any checks caused by the first move. So if there is no legal first move, it is stalemate.
This is stalemate.
This is also stalemate.
Would this wording be more clear?
The game ends in stalemate if at the start of his turn a player is not in check and cannot complete either a legal two move turn or a legal single move turn.
(Note: my answer below is not clear and not quite correct. It is also out of date--the rules have been renumbered and it should now refer to rule #2. Please disregard this answer and see the full rules and subsequent discussion above.)
Okay, I see that I need to clarify this rule. To answer each of your scenarios:
Would this wording be more clear?
The game ends in stalemate if at the start of his turn a player is not in check and cannot complete either a legal two move turn or a legal single move turn.