Shortest-proof-game challenge

wrong positions

Oh forgot to move the pawn to e4, well it would still be 70 as I actually triangulated to make it whites move and e4 would have done that.

Here's a proof game, might be optimal

Less than half of mine..this is why I stand no chance in this thread LOL, half the time was forgetting what squares the pieces had to be on..

I was hoping some others might help me celebrate the return of daStrwbrry, who in the past was one of the top contributors here.

is it unique

Thanks. It feels nice to be back here after all those months.

hi

I'm fairly certain it's unique, after doing a bit of rigorous analysis. However, I might have overlooked something and there could possibly be a dual. Maybe someone else who is more certain than me, or a proof game checker, could validate the uniqueness of the SPG.

can n9531l1 comp test it

Stelvio 1.31 says it's unique. If EvinSung composed it, it's the new record for longest unique SPG composed by one of the regulars here, breaking Leither123's 32.0 record.

To my knowledge, the longest unique SPG by anyone is still 57.5 moves.

i did compose it

White actually has no legal last move in the position. e3 means the bishop could never have gotten to d1 before that.

The new record is 34.0 moves by EvinSung.

what if black made the last move(ie white to move)

Now that I look at it blacks only last move would have had to have been capturing a white piece with the black e pawn, maybe from f7 for example.

I’d like to see someone attempt this.

My attempt.