Chess

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Across
  1. 6. when you respond to one threat with another (13)
  2. 8. a turn which doesn't significantly alter the position (7,4)
  3. 10. a trick (6)
  4. 13. a type of chess where ones sight of the board is removed (9)
  5. 15. rooks love this (4,4)
  6. 16. immobilising a piece (3)
  7. 17. an in-between move (11)
  8. 18. a way to lever open a position (4,5)
  9. 19. fast chess (5)
  10. 20. when two pieces are attacked along the same line (6)
Down
  1. 1. when all possible moves are bad (8)
  2. 2. looking at more than one piece at once (4)
  3. 3. a new move in an opening (7)
  4. 4. promotion likely? (6,4)
  5. 5. looking through one of your own pieces to attack or control a square (4)
  6. 7. when one piece moves to allow another to attack (10,6)
  7. 9. a swap (8)
  8. 11. time (5)
  9. 12. the framework of a position (4,9)
  10. 14. deliberately losing material for an advantage (9)