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King Activity

King activity means the king takes part in the fight. An active king moves toward the center and attacks enemy pawns.

A passive king

White king is on e1 and Black king is on e8. Both kings stand on their back ranks and take no part in the fight.

FEN: 4k3/8/8/8/8/8/8/4K3 w - - 0 1

a b c d e f g h
8 . . . . k . . . 8
7 . . . . . . . . 7
6 . . . . . . . . 6
5 . . . . . . . . 5
4 . . . . . . . . 4
3 . . . . . . . . 3
2 . . . . . . . . 2
1 . . . . K . . . 1
  a b c d e f g h

An active king

White king is on e4. It stands in the center and can attack pawns on both sides of the board.

FEN: 4k3/8/8/8/4K3/8/8/8 w - - 0 1

a b c d e f g h
8 . . . . k . . . 8
7 . . . . . . . . 7
6 . . . . . . . . 6
5 . . . . . . . . 5
4 . . . . K . . . 4
3 . . . . . . . . 3
2 . . . . . . . . 2
1 . . . . . . . . 1
  a b c d e f g h

King attacks a pawn

White king is on e4 and Black pawn is on f5. White captures the pawn and the king becomes more active.

FEN: 4k3/8/8/5p2/4K3/8/8/8 w - - 0 1

a b c d e f g h
8 . . . . k . . . 8
7 . . . . . . . . 7
6 . . . . . . . . 6
5 . . . . . p . . 5
4 . . . . K . . . 4
3 . . . . . . . . 3
2 . . . . . . . . 2
1 . . . . . . . . 1
  a b c d e f g h

Key points

  • A king in the endgame is a strong piece. It moves like a king in any stage, but now it can step forward safely.
  • Bring the king to the center in the endgame. A central king attacks pawns on both sides of the board.
  • A king left on its back rank in the endgame takes no part in the fight.
  • Use the king to defend your pawns and attack enemy pawns. The king is the best pawn defender in the endgame.
  • Activate the king before pushing pawns too far. A pawn far ahead without king help is easy to capture.

Try it Yourself

Edit the code, then press Run.

Running is simulated · Rust Playground

Exercise

White king is on e1 in an endgame with only kings and pawns. What should White do?