No.757 (GF)

 No.757 Geoff Foster(Australia) Original Problems, Julia’s Fairies – 2015 (I): January – June    →Previous ; →Next ; →List 2015(I) Please send your original fairy problems to: julia@juliasfairies.com

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 FosterAustraliaoriginal – 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) 1...nSc4-a3 2.Ke6-f6 nQh5-f7 + 3.Kf6-b2 nQf7-a2 # 1...nSc4-a5 2.Ke6-e7 nQh5-e8 + 3.Ke7-b4 nQe8-a4 # 1...nQh5-c5 + 2.nSc4-a4 nQc5-e7 + 3.Ke6-b3 nQe7-a3 # { (C+ by Popeye 4.69 and WinChloe 3.31)} When the Knight is on the square above the Queen, if it is White’s move then both pieces move like a Queen, if it is Black’s move then both pieces move like a Knight. (Author)

6 Responses to No.757 (GF)

1. Julia says:

I like this light problem! The double check done 3 times with a BTB pair nS/nQ: one check by nQ and another one by nS in the role of Q. For the Black, escaping with nS won’t defence from the mate by nQ, but all possible moves of the nQ in the role of S would give an illegal selfcheck again.

2. Luce Sebastien says:

Yes it is a pretty echo !
Congratulations Geoff
SL

3. Nikola Predrag says:

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.
🙂