Shortest-proof-game challenge

wow

It is 24, I forgot pawn a7

wooow

I'm eager to see how short #845 can be made.

How many moves did it take to get to this position?

#866 is pretty easy. A knight can't cross the board in three moves, so it takes four to reach the same color square and five to reach the opposite color. Each side just makes the ten obvious moves.

6.

mate so half moves dont matter, black to move and no legal move.

Now that you've warmed up with this puzzler, see if you can shorten #845.

This position was posted in the Illegal Position thread by someone who thought he had made an illegal position. I made a 49.5 move proof game for it to show it was legal, but didn't try to optimize the game. How short a game can you make for this position?

#871

Good work. I thought you had stopped following this thread, since you haven't done any shortening on #845.

One move shorter

And another move shorter

32??? i got 40 well oops

#876
Shortened it is 24 moves: #862

#878

i got 29 ...