I too failed to notice it! I agree with Geoff Foster, the problem has many subtle points!
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This problem is more subtle than I realised!
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For Isardam the move is illegal if "a Madrasi type paralysis will result." Here does any paralysis occur? 🙂
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Is the bPf5 needed so that in (c) Pe2-e4 is illegal? According to Popeye the move Pe2-e4 is illegal anyway,…
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Oh now I see, in (c) the white knight prevents Sb2xBd1 and Sf2xBd1.
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Why is the white knight needed in part (c)?
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The white knight seems to be needed for only part c.
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In Isardam only way for black to check with Ba8 is to capture a white bishop on d1 (because white's…
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Clever! In all parts the wK is in an apparently illegal check. (a) uses the en passant trick, in (b)…
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c) 1...c2:Bd1=S
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