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Zero.  No illegal moves need be made.
It is possible that the white pieces began at the top.  Two pawns on each side advanced to permit each individual piece to move in legal fashion out of their starting places to their mirrored locations, that is other than the King and Queen which would swap their final mirrored positions. No captures needed to be made, and each King can avoid moving into check while it journeys to its "final" locations. Finally, the remaining pawns may be advanced to their "final" positions.
What might be asked is what are the minimum number of legal moves to arrive at the position?

If given that only pawns were moved, all captures were removed, no new pieces were added to the board, and the physical laws were not teased, then the minimum number of illegal moves would be eight. Eight of the pawn could have simply been "hopped" over the pawns into their "final" locations.

 

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2 hours ago, TimeSpaceLightForce said:

What is the least number of illegal chess moves that would result in such position as shown?

 

 

Assuming a "move" is moving a single piece and not "swapping two pieces":

Eight.  Eight of the pawns can make it to their current square without illegal moves.  The other 8 must illegally hop or teleport to another space.  I guess I could notate it out to make sure the answer isn't nine (where the other illegal move would be passing).  But 8.  Actually, 8 for sure, since the king on either side can triangulate to lose a tempo, if necessary.

0 if we're playing bughouse.

Edited by Molly Mae

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2 hours ago, DejMar said:
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Zero.  No illegal moves need be made.
It is possible that the white pieces began at the top.  Two pawns on each side advanced to permit each individual piece to move in legal fashion out of their starting places to their mirrored locations, that is other than the King and Queen which would swap their final mirrored positions. No captures needed to be made, and each King can avoid moving into check while it journeys to its "final" locations. Finally, the remaining pawns may be advanced to their "final" positions.
What might be asked is what are the minimum number of legal moves to arrive at the position?

If given that only pawns were moved, all captures were removed, no new pieces were added to the board, and the physical laws were not teased, then the minimum number of illegal moves would be eight. Eight of the pawn could have simply been "hopped" over the pawns into their "final" locations.

What might be  the minimum number of legal moves to arrive at the position? Start by exchanging the rooks and knights ( i.e. 20 moves for both players then 20 moves more)

 

 

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