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A flight square is a square a king or a valuable piece can flee to when attacked (or checked).

a b c d e f g h
8 a8 b8 c8 d8 e8 f8 g8 h8 8
7 a7 p b7 c7 R d7 e7 f7 g7 p h7 k 7
6 a6 b6 c6 p d6 r e6 f6 g6 h6 p 6
5 a5 b5 P c5 d5 e5 f5 g5 h5 5
4 a4 b4 c4 d4 e4 f4 g4 h4 B 4
3 a3 b3 c3 d3 e3 f3 p g3 h3 3
2 a2 P b2 c2 d2 e2 f2 P g2 h2 P 2
1 a1 b1 c1 d1 e1 f1 g1 K h1 1
a b c d e f g h
1.h3 gives white space to flee 1...Rd1#.
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