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Here is another direct link to it once more. This one is also verified to have one possible solution by a camera.

The stipulation "ser-Ze3 in 208 moves" means this: The "ser" is short for seriesmover, the "-z" part is the accepted notation for problems in which the goal is for one side to reach a certain square, and, lastly, "e3" is the chosen target square.

Here is another direct link to it once more. This one is also verified to have one possible solution by a computer.

The stipulation "ser-Ze3 in 208 moves" means this: The "ser" is short for seriesmover, the "-z" part is the accepted notation for problems in which the goal is for one side to reach a certain square, and, lastly, "e3" is the chosen target square.

A search of the Die Schwalbe Chess Problem Database reveals that the current record length, as of writing, to move a king to a designated square in a seriesmover in a legal position with promoted piece, is 208 moves long.

Now, since this is a legal position, and you allow for illegal ones, this is but a proven lower bound!

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A search of the Die Schwalbe Chess Problem Database reveals that the current record length, as of writing, to move a king to a designated square in a seriesmover in a legal position with promoted pieces, is 208 moves long.

Now, since this is a legal position, and you allow for illegal ones, this is merely a proven lower bound!

*Addendum #2: With @Retudin's suggestion of placing an additional Black pawn on the bank tank, to the 129-mover, and my idea of moving around a few pieces, we have here a new record of 135 moves, with the king starting in check. The solution is still inherently the same, so there is no need to put it in.

Addendum #2: With @Retudin's suggestion of placing an additional Black pawn on the bank tank, to the 129-mover, and my idea of moving around a few pieces, we have here a new record of 135 moves, with the king starting in check. The solution is still inherently the same, so there is no need to put it in.