No.757 
Geoff Foster
(Australia)

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Original Problems, Julia’s Fairies – 2015 (I): January – June

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No.757 by Geoff Foster –  Three nice mates by Back-To-Back neutral pair in a three-men problem! (JV)


Definition:

Back-To-Back: When pieces of opposite colors stand back-to-back with each other on the same file (white piece is on the top of black!), they exchange their roles. A pawn on the first rank cannot move. Any piece can make an en passant capture when it has got a role of Pawn by Back-To-Back.


No.757 Geoff Foster
Australia

original – 24.03.2015

Solutions: (click to show/hide)

Black Ke6 Neutral Sc4 Qh5

h#2,5           3 solutions       (0+1+2)
Back-To-Back
(no white King)


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Luce Sebastien
Luce Sebastien
March 24, 2015 18:12

Yes it is a pretty echo !
Congratulations Geoff
SL

Nikola Predrag
Nikola Predrag
March 24, 2015 19:43

Supreme elegance, bravo!
How might it be called, a “BTB+anti-BTB selfcheck-incarceration”?
BTB effect determines whereto nQ might move but then, the cesser of BTB effect would cause a selfcheck.
🙂

Diyan Kostadinov
Diyan Kostadinov
March 24, 2015 22:18

Very nice

Mike Neumeier
Mike Neumeier
March 25, 2015 04:28

If anyone is ever to write a treatise on the combined elements of Neutrals+BTB, this example should go in there. A succint demonstration, with beautiful three-solution echo. Funny, too (KxnQ is no defense)!

Ganapathi
Ganapathi
March 25, 2015 14:51

Well said, Mike! Appears to be the best definition for BTB. Even I can understand it without any confusion!