Nor from Kt 3 or 4, as both are now doubly guarded, so that he cannot have moved out of a check.
(The White Kt now helps to guard Kt 5.)
Nor can he have moved from K 2, as the White P on Q 6 cannot have moved to give check.
No other P can have moved.
The K P cannot have moved from K 3, became of the position of the White King.
Therefore Black’s last move must have been P from K 2 to K 4, which White can take en pas giving Mate.
No. XXVIII
B—Q 2P—R 7 B—R 5P—R 7 becomes Q P—Kt 4any White hasno move.
The way in which the B runs to earth and is shut in is most ingenious. Black with the new Q cannot anyhow give White a move.