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  • #2
  • Here is a more complicated version of
  • "corresponding squares" like position
  • #1.
  • There are two things to understand
  • about this position ...
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  • If the White King can reach this
  • square then he wins.
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  • Likewise, if Whtie can reach this
  • square then he also wins, even if
  • Black has opposition, because White
  • has a tempo move.
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  • So if we go back to our starting
  • position with White to move.
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  • After Kf3, Black has to go to e5 to
  • both block e4 and still be able swing
  • over to g6 to prevent the White king
  • from reaching h5.
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  • If Black is on any other square then
  • he cannot stop both threats.
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  • That makes these two squares
  • "corresponding." This works like
  • king opposition, because whoever has
  • to move is at a disadvantage.
  • Suppose the game were to continue
  • ...
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  • For the moment, White is not making
  • any progress. These squares are also
  • "corresponding", and if the Black
  • king were on any other square then he
  • would not be in an ideal defensive
  • position to stop both threats.
  • Now if White goes back...
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  • He is still not making progress, so
  • ...
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  • White repeats the position.
  • How does White win from
  • here?
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  • By going ot this square, or g2, the
  • White king threatens to move to
  • either f3 or g3.
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  • If the Black king were to move to e5
  • then White would move to the
  • corresponding square of f3, which
  • forces Black to move out of the only
  • defensive square that works here.
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  • On the other hand, if the Black king
  • moves to g6, then the White King can
  • march up to e4 unimpeded.
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  • However, Black has a trick. By going
  • to e6, he is threatening to respond
  • to Kf3 or Kg3 with Ke5 or Kf6
  • respectively, moving to the
  • corresponding square in each case.
  • So how does White win
  • here?
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  • White has his own trick, which is a
  • triangulation. This forces Black out
  • of position, because he has to commit
  • his king to f6 or e5. Other squares
  • are worse.
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  • If the Black king moves to e5 then
  • Kf3 is winning. This forces Black
  • out of his ideal position where he
  • can't defend both sides.
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  • On the other hand, if the Black king
  • moves to f6 then Kg3 is winning.
  • This also forces Black out of his
  • ideal position where he can't defend
  • both sides.
  • If play were to continue ....
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  • White to move.
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  • White to move.
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  • White to move.
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      [Next]
  • White uses his last tempo move to
  • gain opposition and win.
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