his Queen and moves her along the diagonal that ends on K5. This, of course, can only be the KR5 as the Queen from her original position would have to follow the diagonal terminating in QR4 if she played into a square on her own side of the board. The student will see that when the Black Queen occupies R5, she gives check to the White King as there are no Pieces or Pawns interposed between them.
| 5, | K—K2 |
| P—Q4 |
(5) As check has been given to White's King, the only move he can legitimately make is one to avoid the check. As the student has already learned there are three ways of accomplishing this: (1) By capturing the checking force; (2) By interposing another Piece or Pawn; (3) By moving the King. The student will see that there is only one play open to White and that is to move the King to K2; for if a Piece or Pawn were interposed it would be captured in the Black Queen's next move when she would again give
