23...If 23...Rxd5 24 Nb6 regains p.
23...Rb5? - There's no need
to allow the rook to be tempoed after
a possible 24 f4!. After the game's
23...Ra5, 24 f4 could be answered
by 24...Neg4.

26...The game's only mistake - enuf
to lose, apparently. 26...Qe6 looks
to be a better move here. If 27 Bc4
Qf5. If 27 Rxb4 cb 28 Nc4 Ra7!
(No need to push with 28...Ra1?, since
29 Rxb7! is prob. good for White.)

29 Rxb2 (29 Nxb2 Rd8 30 Nc4 will
transpose) Bd5! 30 Rb4 (30 Rc2 Rc8
31 Nb6 Rxc2 32 Qxc2 Qxd6 33 Nc8 Rc7;
30 Nb6 Rb7 31 Qb1 Rfb8) 30...Rd8.

Black is without problems here.

Sidebar note on 29...Bd5! by
COMPARISON with the 'bot-shot' dog
of 29...Rc8?

29...Bd5! - Technique: MOVING THE
TARGET. Another example of that
(from White) defeats 29...Rc8?:

29...Rc8 30 Rb4 Nd5 (sidebar note:
do not go engaging in tactics while
leaving loose pieces dangling; the
strongest tactical operations are
where your pieces are INVIOLATE!)
31 Rb3 (forced) Ra2? (over-exuberant;
it works after the immediate 32 Rxb7?
Nc3! 33 Bg4 Qxc4, with lines that lead to =. But it fails to...) 32 Bg4! (immediately; ISOLATING the
tactical operations from a multiplicity to a singularity: JUST the loose bishops on either side)
32 Bg4! (moving the target!) defeats
32...f5 with 33 Bxf5! etc.