Shortest-proof-game challenge

white pawn promote on a8

i was trying e8

yes

and logically

that was a good position

requires 2 black promotions, which are not obvious

black looks like he has a bunch of free moves to maneuver when there is none (the qa6 is for changing move turn and rook and knight for promotion)

#3641 in 20.5

You can do without Black promotions, but I liked your solution with the extra Knights. From my minimal moves counting, yours must be an SPG.

for the record, the b1 knight couldve been any piece (its use was to optimally get rid of blacks c pawn and whites b pawn) and the g1 knight was given by evin sung in "the h pawn is captured on e2"

also, i think these other solutions (with more black piece movements) were unintentional

I was guessing you would find it, if anyone did. Here's my 62-move game.

It was a very tricky position indeed, even though it seems black could have easily given white tempi. I considered as an afterthought whether promoting to another piece was possible, but a rook/queen would prevent Kf5-e6 being legal, and a bishop couldn’t escape.

Now it’s my turn to challenge you. Another one I made:

That's very impressive. I wonder if daStrwbrry's game is any shorter.

i did not try to make it short

The little knight shift was intended. Here’s my proof game, could be a bit shorter:

17.5