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The term “traditional two-mover” refers to one where the merit lies in the key and post-key variations, as opposed to a problem where the idea is spread over a number of phases. Easter’s problem is an excellent example.
A thematic key, 1.Sxe6, pins the knight, gives a second flight square at e4, and threatens 2.Sbc5. 1...Ke4 unpins the knight, which then mates by 2.Sg5. After 1...Kc4 the threat piece must control b5 with 2.Sbxd4. Three knight defences also unpin the knight by interference – 1...Sfe3 2.Sec5 (not 2.Sg5? unpinning the black bishop, which can then interpose at e6); 1...Sge3 2.Sg7, shutting off the rook - again not 2.Sg5?, and 1...Se5 2.Sc7, exploiting the selfblock to double-check while shutting off the bishop guard of e5. The rook unpins by withdrawal - 1...Rb1 or Rc1 2.Sec5, and the remaining two variations are 1...Rxe6+ 2.Qxe6 and 1...Sxd2 2.Sxd2. Well-varied strategy.
Jacob Hoover: Battery play is my favorite chess problem theme, and this problem definitely delivered on that, with no less than seven different battery mates (including the threat). As a result, I enjoyed this problem immensely.
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