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a b c d e f g h
8 a8 b8 c8 d8 e8 f8 g8 h8 k 8
7 a7 b7 c7 d7 e7 f7 g7 h7 P 7
6 a6 b6 c6 d6 e6 K f6 g6 P h6 6
5 a5 b5 c5 d5 e5 f5 P g5 h5 5
4 a4 b4 c4 d4 e4 f4 g4 h4 4
3 a3 b3 B c3 d3 e3 f3 g3 h3 3
2 a2 b2 b c2 d2 e2 f2 g2 h2 2
1 a1 b1 c1 d1 e1 f1 g1 h1 1
a b c d e f g h
Black has stopped white's ability to penetrate by creating a fortress. 1...f6 results in a sacrifice Bxf6 2.Kxf6 1/2-1/2 for stalemate and 1...g7 can be countered with Bxg7. White's bishop cannot do anything to influence the king or control the pawns' next squares.

In an endgame, a fortress is an impenetrable region the losing king rests in to avoid checkmate. A fortress may be:

  • a zone (black squares)
  • the ability to checkmate (blocking pawn)

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