This was the game I enjoyed most, spent most time on yet was least able to judge! Commenting turned out to take longer than I expected. I kept variations to a minimum, which is probably best given the wild game that was in it, allegedly a feature of most of Jonathan's games judging from other player's comments.
NCO. White ns to play Nc3-e2-d4 forcing a trade which allows Qd4-a7 hoping to trade queens and then endeavour to make use of the extra pawn.
With the idea of enticing the d8 rook to h8 as White intends playing on the queen side. The threat of h7 is potentially strong as we shall see later.
The alternative is similar but Black has been forced to play ...Rh8 which removes the potent threat of h7.
Black is pro bably now lost. Better was 23...Rh8 nullifying the threat of h7. Alternatively as Black suggested afterwards
Maybe 25...Kd7, trying to hold on to the queen
Having swapped off queens, the rest is a matter of technique. The f- and g- pawns cannot be stopped without considerable material loss.