(10) R-g1 and the mate can only be averted by the sacrifice of
the Queen for the Rook.

The second defense which Black could try is (1) ..., Ktxf3+; (2)
Pxf3, Bxf3. Now (3) Bxf6, Pxf6; (4) Q-h6 would be fatal for White
as Black plays K-h8 and there is no protection against the threat
R-g8+. But White can again make a preparatory move which secures
for him the victory. This is (3) P-h3, with the view to make room
for the Rook by K-h2. The only way to counter White's threat is
now P-c6. However, after (4) Ktxf6+, Pxf6; (5) B-h4, K-h8; (6) K-
h2, R-g8; (7) R-g1, Q-e7; (8) R-g3 Black is unable to stave off
defeat any longer. Whatever he plays, White succeeds in attacking
f6 for the second time while Black has no second protection at
his disposal. For instance, (8) ..., B-h5; (9) Q-h6, B-g6; (10)
R-f3--or (8) ..., Rxg3; (9) Pxg3 and (10) Rf1.

The most interesting line of defense is the third one mentioned,
that is (1) ..., P-c6. After (2) Ktxf6+, Pxf6; (3) B-h4 a
situation arises similar to the one discussed in the line of play
commencing with (1) Ktxf6+, but with the big difference that
White is now one move ahead in the attack. This is the move Q-d2
in answer to which Black was forced to make the move P-c6 which
does not improve the constellation of the Black pieces in any
way.

This one move is sufficient to secure for White an easy victory.
After (3) ..., Bxf3; (4) Q-h6, Kt-e2+; (5) K-h1, Bxg2+; (6) Kxg2,
Kt-f4+; (7) K-h1, Kt-g6 the position of Diagram 48 is reached in
which White can force the mate, or win Black's Queen in a most
ingenious manner. If White tried to win by (8) R-g1, threatening