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Problem 512: James Quah - Fairy (Quintessence)
james.quah(27.01.2015) The author wrote: "I had a look at the article on the Leibovici interference, and felt inspired to combine it with the Gamage unpin."
 
 
 
 
 
 
 
 
 
 
512
e3,g4: Quintessence
 
    1.Bd2! (2.Ra5#)
1...QNb4 2.Qa1# (2...Qa3?/QNa2?/QNxa1?)
1...QNd5 2.Qf1# (2...Qd3?/QNe2?)
1...Qb6+ 2.Qxb6#
 
The line-pinned black quintessence interferes with the black queen. White mates by unpinning the black queen (Gamage unpin), and the black quintessence cannot stop the mate as it is pinned.
(Author)
 
Quintessence: A rider that makes knight moves, changing direction in a 90 degrees zigzag route (movement: a1-b3-d2-e4-g3-h5).
 

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