Q—B sq.P—K 7 Q × BP ch.K—Q 3 Q mates.
if
K—Q 2 Q × BP ch.K—B 3 Q mates.
There are other variations.
No. LIII
B—R 8K—R 2 Q—QR sq.K moves Q—Q Kt. 7, mate.
No. LIV
Q—R 5B × Q or B—B 2 Kt—Kt 5any Kt mates.
Q—B sq.P—K 7 Q × BP ch.K—Q 3 Q mates.
if
K—Q 2 Q × BP ch.K—B 3 Q mates.
There are other variations.
B—R 8K—R 2 Q—QR sq.K moves Q—Q Kt. 7, mate.
Q—R 5B × Q or B—B 2 Kt—Kt 5any Kt mates.