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A three-mover whose two leading variations show complex and well-matched strategy.
A highly thematic key, 1.Sxc6, threatens 2.Rd5+ Kxc6 3.b5, but by vacating
the long diagonal allows two checks. 1...g6+ is met by 2.Se5, threatening
3.Rd5. If Black guards the threat square with 2...Sc3 he unpins the
knight, which mates on f7, exploiting the pawn's interference on the
queen. Similar strategy is seen in the variation 1...g5+ 2.Sd4 (threat
3.Rd5) Sc3 3.Sxf5. In both lines 2...BxS+ is met by 3.QxB. If Black
defends by 1...Sc3 the blocking of the diagonal allows the white knight to
play to a5, threatening 3.Sb7, and the only defence is 2...Sd5 3.Rxd5.
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