(12) White might move his QB to KB4 and capture the Black Pawn but his position is too critical and it is wiser for him to bring his strength nearer the King so that if he is attacked, he can move into Qsq. and be protected. For this reason, the best move is QB—Q2. Another reason for this move is to clear the first rank for the Queen's Rook.
Black now moves his remaining Rook to Ksq. and gives check.
| 13, | K—Qsq. |
| Q—B7 |
(13) White must do something to avoid the check and it has already been shown how difficult it is for him to interpose. Of the five squares which he commands, three are commanded by adverse forces; Ksq., KB2, K3, therefore, his only moves are to Q3 or Qsq. The latter is the correct play, as it enables him to get his King into cover, opens the diagonal for the King's Bishop, and opens the way for the King's Rook after the KB has been moved.
For Black's thirteenth move he puts his
