Chessical: A superb game by Rowson. I believe that his 14.0-0-0 is an innovation, and a tribute to his resolution and research into an extremely sharp and theoretical line.
Previously white had castled K-side: Yermolinsky vs A Acosta, 2001 with the Black Q on a5, and Black pawns already at b4 and c3 Rowson still castles Q-side. His Q-side is then shredded, but he repulses the attack gaining a significant positional advantage.
This is chess based on fine and precise calculation, and I feel it is played in the spirit Botvinnik (but from the other side of the board)! Bryson is known to play this line, and the move seems extremely dangerous for White at first and even second glance.
Bryson, taken by suprise, reacts passively with <18...Bb7> <18...Bc4!?> has been recommended by Pritchett and seems to be better: 19.Nxc3 Qa6= (19...bxc3 20.Qxc6+ Qc7) ;
18...Qxa2 is weaker: 19.Nxc3 Bh6+ 20.Be3 Bxe3+ 21.fxe3 Qe6
<19...Qb5!?> may provide a better chance of resistance: 20.Be3 c5 21.Qf5 cxb2 22.Kxb2 Qe2+ 23.Rd2 Qh5, but White is still better.
<21...Qd5> is no better 22.Qxd5 cxd5 23.Kb3
<29.Bxc5?!> loses the initiative after: Rc8 30.Nb3 Nd7, a motif that reoccurs over the next few moves.
<37...Rxg5> is no better after 38.hxg5 Ne4 39.Rxf7 Nd6 40.Nxd6+
The win is straightforward, and Bryson does not need to be shown it: <38.Bxf6> Rxf6 39.Rxf6 Bxf6 40.Ra5+ Kc6 41.Ra6+ Kd7 42.Rxf6