Hastings Underway

FACED a Dutchman in round one of the Caplin-sponsored Hastings Masters.
Willem Brouwer (1662) - Spanton (1951)
Réti
1.Nf3 d5 2.c4 e6 3.g3 Nf6 4.Bg2 Be7 5.0-0 0-0 6.b3
This is the main move in ChessBase's 2020 Mega database, but a popular alternative is to transpose into a Catalan with 6.d4.
6...c5 7.e3
At Trencianske Teplice (Czechoslovakia) 1928, Richard Réti played 7.cxd5 in a win over Ernst Grünfeld, and 7.Bb2 four rounds later in a loss to Baldur Hönlinger.
7...Nc6 8.d4 b6 9.Bb2 Bb7 10.Nbd2 Rc8 11.a3!?
This looks strange to me, but scores a good percentage in Mega20.
11...Re8 12.Ne5 cxd4N 13.Nxc6 Bxc6 14.Bxd4 Bf8!?
Hoping to play ...e5.
15.f4?!
Stopping ...e5, but weakening the e3 pawn.
15.Bxf6 Qxf6 16.cxd5 Bxd5 17.Bxd5 exd5 18.Nf3 is equal, according to Stockfish10 and Komodo10.
15...dxc4 16.Bxc6 Rxc6 17.Nxc4 Bc5 18.Bxc5 Rxc5 19.Qxd8 Rxd8 20.Rad1 Rcd5 21.Rxd5 Rxd5
The engines prefer 21...exd5!?, one point presumably being that White's backward e pawn would be weaker than Black's isolated d pawn.
22.h3?
Keeping the black knight out of g4, but weakening g3.
The active 22.Rc1 was possible as Black has back-rank problems.
22...h5 23.a4
Komodo10's choice. Stockfish10 narrowly prefers the passive 23.Rb1, which becomes necessary anyway.
23...Rd3 24.Rb1 Ne4 25.g4 hxg4 26.hxg4 Nc5 27.a5 b5
Komodo10 is OK with this, but Stockfish10 much prefers 27...bxa5.

How should White meet the threat to his knight?

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28.b4?
The engines prefer 28.Ne5 Rxe3 29.Rc1 Nd3 30.Rc8+ Kh7 31.Nxd3 Rxd3 32.Rc7 Kg6 33.Rxa7 Rxb3, which they reckon is only slightly better for Black.
28...Ne4?
This allows counterplay. Much stronger is 28...Nd7.
29.Ne5 Rxe3 30.Rb2?
I felt White had to go for 30.Nc6 eg 30...Rg3+ 31.Kh2 a6 32.Nb8 Rxg4 33.Nxa6 Rxf4 34.Nc7, when Black is two pawns up but White has a fast-moving passer. The engines give 34...Nc3 35.Rc1 Na2 36.Ra1 Rc4 with an unclear position that they reckon favours Black.
30...Rc3
Killing counterplay.
31.Kg2
On 31.Re2, I intended 31...Nf6, and if 32.Rd2, then 32...Nd5.
31...Nf6 32.f5 Nd5 33.fxe6 Nf4+ 34.Kf2 Nxe6?
Not 34...f6??, hoping to win White's knight or, via a fork at d3, White's rook, because White wins with 35.e7 Rc8 36.Rd2. But better is 34...fxe6, and if 35.Rd2, then 35...Nd5.
35.Ke2?
The engines give 35.Rd2 f6 36.Rd6 Nf4 37.Nc6 a6 38.Ke1! with drawing chances, albeit preferring Black after 38...Nd5 39.Kd2 Rc4.
35...f6 36.Nf3?
Better is 36.Kd2, but White it still losing after 36...Rc7.
36...Nf4+ 0-1