[Retros] Add pieces

Noam Elkies elkies at math.harvard.edu
Sat Mar 12 12:15:43 EST 2011

Theodore Hwa <hwatheod at cs.stanford.edu> writes:

> Does this work? (18 units)

> Put all white pawns on 5th rank.

> Put all black pawns on 4th rank.

> Kings anywhere not in check.

Is this even legal to begin with? There's no way to retract
a pawn move, right?

afretro <afretro at yandex.ru> writes:

> What's all the fuss about?

> [...] Any position with closed balances would do. E.g. [...]

That's another risk of trying to compose tasks well past midnight...


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