[Retros] Example 2 with castling from Yefim Treger 08/21/2004

[Joost de Heer]

>    Here is the second example (you may look at picture or attached file, if 

> any)


W: Ke1 Rh1 Bb2
B: Kd6 Pe2

This position is legal. And your lemma was 'There are positions which you can't prove to be legal or illegal'.

I think you meant to say 'There are positions in which you can't prove or disprove the legality of some moves'. And this is trivially true (you can never prove the legality of castling, only the illegality)

Joost
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