Christmas puzzles: Add-a-king, and take that back! – Chessbase News

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12/27/2020 In the venerable tradition of our Christmas Puzzles, a tradition that has endured for over twenty years, we always strive to provide you with "computer-resistant" problems. You must not be able to solve them by pressing Alt-F2 or clicking on a fan icon. They should also be different from traditional chess problems. Today you have to add a piece or retract a move. Today's problems present logical challenges.

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Problem specialists and older readers may be familiar with one or the other of the following problems, which we may have published before. But there are grandmasters who were not born at the time, so simply bear with us.

These twin problems are by the ever capricious T.R. Dawson, composed in 1927. Your task is on each diagram to add a white queen on a legal square and then stalemate Black in one move. But in doing so you will have to figure out why, in two diagrams that are perfect mirror images, the solutions are quite different.

It should be mentioned thatBengt Gibel published a variation of Dawson's problem nineteen years later. In the above positions you are required to add a white queen, but this time to mate in one move. And of course the question remains: why are the solutions so dissimilar? And the answer to that is exactly the same as for the Dawson problems.

In this problem you are required to replace the white king on the board and thenmate in two moves. If you find the solution and are a problem enthusiast, you can work out why each of the pieces is necessary for the problem to succeed.

The first position is a classic it was composed 110 years ago! White takes back his last move and plays something different, mating instead in one move. The second position is just ten years old and requires that White takes back his previous move and instead mates in two moves. This problem has a nice little logical twist.

And finally a more recent retractor:

White takes back his previous move and instead mates in one

The solutions to all of the problems of our Christmas gallery will be published on January 1st of the new year which will hopefully be better than the dreadful 2020. To all our readers: stay safe and keep cheerful.

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Christmas puzzles: Add-a-king, and take that back! - Chessbase News

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