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

Joost de Heer ildjarn666 at linuxmail.org
Sun Aug 22 07:21:20 EDT 2004

> 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)

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