Shortest-proof-game challenge

At this rate, Evin should start publishing these games. 41 moves is crazy.

Getting closer to the current published record of 57.5 moves.

we have a professional composer hiding here

i am just here for fun i focus more on real chess

Still, you have great talent for these long proof games. They are not easy to make, yet you still make a proof game longer than 40 moves! That’s a very impressive achievement.

Also, you’re not too far off the longest PG. If you continue with extending this proof game, you might get even closer to the record, or possibly exceed it.

i imagine adding 17 moves (exceeding) would take some effort

duals can creep up wherever

I am aware that it would be a challenge to just add moves without duals popping up, but who knows? Anything is possible. EvinSung has extended the proof game several times and managed to get it unique in some instances.

unique or not

I’m unsure about this one. I have a 44.5 move game, is it shortest?

Here are two positions based off an old idea:

Here's one of many SPGs for second position. First position takes a little longer to check because it was posted as a white-to-play position with Black in check.

If it is, it's dualed.

Here's one of several SPGs for new version of second position.

Unique SPG in 23.5 for first position.

Bringing the thread back on topic?! 😉

This seems hard. It looks like five of Black's six captures were by the a7 pawn on dark squares, but the pawn didn't capture either of White's bishops, since one was the wrong color and the other was captured at home. That leaves only four white units for the pawn to capture. What am I missing?

You could be right...I did a wee something to lower the difficulty.

Lower the difficulty? Or did you mean eliminate the impossibility?

Here's a first try. How much shorter can it be?