Remarkable! The key was "squeezing" the old king out of his safe haven behind the major pieces.

I'm always amazed by the ability of masters to identify lines like this after the fact. IM Trendle, if I may ask...how long did it take you to find the line in the puzzle?

It would have probably took me an hour before I could fully understand this line.... 

another option 11. ...Rb5 12. Rc5 Qxc5#

i  solved puzzle in 23 sec, thx for report

It's very pretty, kind of impossible to exactly calculate at the board, though!

From the position at move 30, I saw another winning variation, less pretty but a lot easier to calculate (it starts with the same move):

30... Rd6+ 31. Kc2 Qxe3 32. Rxd6 Qc5+ and Black wins the Rook and the game. Still some effort required but it looks like a won endgame. Very instructive game, thanks so much!

nice game, good luck

nice i love playing 1...f5 against the english. actually i play 1...f5 against every first move besides 1.e4 and 1.g4

Please be relevant, helpful & nice!

Good luck man..

A quick post-script - at least I have a couple of reasons to be cheerful: the team won an exciting match 7-5 and the game wasn't FIDE Rated. This weekend I'm playing in the National League where the time-control is 40/2hrs rather than last night's 30/75mins +15min.