So, promoting a pawn in chess is undefined behavior? | Hacker News

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		Maken on Sept 18, 2015 \| parent \| context \| favorite \| on: The Hardest chess problem in the world? So, promoting a pawn in chess is undefined behavior?

dragonwriter on Sept 18, 2015 | [–]

No, its defined (both then and now), its just the spec has had breaking changes from earlier versions.

lmm on Sept 18, 2015 | [–]

No. It was unclear whether you could promote to a piece of the other colour, but a conforming implementation of chess will not make demons fly out of your nose.

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