Christmas Puzzle flaws and corrections

When he previewed our puzzle page on Christmas Eve John Nunn solved the first
position in fifteen seconds (yes, he’s slowing down with age). But then he woke
up on Christmas day in a cold sweat, realizing that the problem was flawed.
The same conclusion was drawn by problem expert Noam Elkies. Today we give you
an explanation, a correction, and a new position to bait
your computer.

Related posts:

1. A Merry Christmas with the 2011 ChessBase Puzzles ...
2. ChessBase Christmas Puzzles 2011 – the daily challenge ...
3. Christmas puzzles prize contest: closing date is Sunday! ...

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