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A problem which combines the primary and secondary forms of its theme with great clarity.
The key, 1.Qe4, threatens three mates, 2.Qd4, 2.Qc2 and 2.Qd3, which are separated by the moves of the a2 knight and f7 pawn: 1...Sb4 2.Qd4, 1...Sxc1 2.Qc2, and 1...fxg6 2.Qd3. Any move of the g2 knight prevents all three threats by pinning the queen. Simply lifting the knight from the board allows three new mates, 2.Sd5, 2.Rd3 and 2.Rc2, and these are separated by arrival effects: 1...Se1 2.Sd5, 1...Sxe3 2.Rd3 and 1...Sf4 2.Rc2. This idea of separation of multiple threats is named after Hungarian composer Ferenc Fleck. A primary Fleck involves mates threatened by the key, whereas a secondary Fleck occurs when the thematic mates are allowed by the moves of a defending piece.
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