Shortest-proof-game challenge

At #6081 you essentially said, "Here's a legal position with White to move. But it might be illegal with White to move."

I might take a look at these after EvinSung tells us how much shorter #6057 and #6079 need to be.

idk

@6087

@6088

shortest game with Bc2d3

Here's a 14.5 move game which requires the annotation Bc2d3. But is it the shortest?

@6094

It is the shortest, but not unique.

Obviously not unique. Black has numerous alternatives for tempo moves.

Bc2xd3#

Here's a 16.5 move game. But is it the shortest?

@6098

Fastest game that ends with cxb8=N# but the knight is not the checking piece.

@6100

Here is one, can be shorter

Here's one way. Could be a shorter way.

@6102

Shorter

#6081

@6104

Shorter