12.Bd3Compare our notes to the 9th game of the contest up to this point where Tschigorin here played B—Kt3. The move in the text is by far superior and in fact it wins.
12…Bxc3There seems to have been no other course open to Black, as Kt—B4 was always threatened.
13.Rab1This beautiful waiting move wins by force. See Diagram page 176.
13…Bb7If 13…Q—Kt3; 14 B×Kt. 14 K×B; 15 Q—B4 with a winning attack.
15…b5Equally bad was 15…B—Q5; 16 Kt×B, 16 P×Kt; 17 B×P, and of course if 17…Q×B; White wins the Q by Kt—Q6 ch.
17.Rfc1White would have made shorter work of it by P—Q6. If Black replied P×P the Kt would retake checking and win a piece, whilst wherever the KKt moved the answer P×P would equally win.
18.Bxd6Again R×P followed if Black took the B by P—Q6 would win most speedily.
23…Kd6Black had only the choice of evils. If K—K sq., White would double the Rooks on the 7th file and also win with ease.
27.f3White's victory is now practically settled.
William Steinitz, The Modern Chess Instructor (1889) · Public domain · source