His “castling” privilege is a European invention; but he formerly leaped two and even three squares, and also to his Kt 2nd.
Especially used when a Rook is won at the expense of a B or Kt.
My opponent, who decided to take no chances, played 51 B - Kt 7, and finally won as shown below.
Kt to KB3” in the London tournament, 1883, and this, or the kindred “1.
This threatens to win the Kt, and thus forces White to give up the exchange.
There is no object in this move, unless it is to be followed by Kt - Q 2.
He may have also done it in order to play Kt - Kt 4 and K 3.
Kt - Q 2 was better in order to get rid of one of the two White Knights.
The Black Bishop at Kt 2 becomes a very powerful attacking piece.
An attentive examination of the eight separate methods of reply to your second move of K's Kt.