[Retros] Fwd: Proof game promotion task

Juha Saukkola juha_saukkola at hotmail.com
Mon May 10 01:06:02 EDT 2010

Sounds quite difficult task, but if you really want to see it happen,
offer some money for first solution!


> To: joose_norri at hotmail.com; retros at janko.at

> Date: Sun, 9 May 2010 22:53:18 -0400

> From: elkies at math.harvard.edu

> CC: tchow at alum.mit.edu

> Subject: Re: [Retros] Fwd: Proof game promotion task


> Tim Chow asked:


> > [...] What is the most number of knights (or queens, or whatever)

> > to appear in the set position of a proof game [with a unique solution]?


> Joose Norri responds:


> > Yes, obviously one could do -- but why!? Sorry, missed the irony.


> I don't see why this need be ironic or ugly; it looks to me like a

> legitimate task. And it certainly *doesn't* look obvious that one can

> promote all White pawns to Bishops in a sound proof game! For starters

> such a game must have length at least 39.5, and it's already nontrivial

> to attain such lengths at all, let alone with 40 pawn moves on one side.



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