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reversal
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    Keywords: EndGame

In CGT, the negative -G of a game G is formed by each of the two players the negatives of the options of the other one; so that in -G we simply reverse the roles of the players in G.


NB This isn't directly connected with reversible plays.

Bill: But we do talk about reversal in CGT in relation to reversible plays.
Charles This term was introduced on the surreal numbers page. Which should perhaps therefore be edited. In fact for myself I find the 'surreal numbers' terminology unhelpful (with apologies to all Don Knuth fans out there).
Bill: The current text says, "negative", but refers to this page. To be precise, the roles of the players are *not* reversed in the negative of a game. I'm going to make a NegativeOfAGame page and change the reference, OK?
Hmmm. I see that Conway talks about role reversal in On Numbers and Games, the classic CGT text. But to me that suggests this:
G = { L | R }
G~ = { R | L } , where G~ is G reversed.


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