White has a bishop that has no good square. After his next move, however, such a square appears, and the black king is seriously weakened:

Other replies are no better.

Black resigned.

Black lands a blow at the most vulnerable point:

A picturesque position. White is completely stalemated.

There is no defence against the transfer of the bishop to f2. White resigned.

White has incautiously moved his rook from f1, where it defended the f2-pawn, and put his dark-squared bishop on a3, where it looks active but does not control any central squares. Black brilliantly exploits these circumstances:

The long diagonal decides the game.

Byrne resigned: 22.Qf2 Qh3+ 23.Kg1 Re1+! (a small tactic to finish things off) 24.Rxe1 Bxd4 25.Qxd4 Qg2#.

The black pieces are directed at the kingside, which is defended only by White’s queen, which in her turn also defends the Ba4. If Black plays some sort of attacking move on the kingside, White will give an intermediate check with the bishop from b3, freeing his queen. Consequently, there followed instead the deflection motif: