Any comments on tactical improvements for both sides in the latter portion of the game and/or strategical suggestions to improve play throughout the game?
It seems winning for White on my first glance. I did not even see this possibility in the game! It demonstrates more consequences of Black's "lemon" on move 12. The best reply seems to be 15. ... Nc3 16. Q x b7 N x d1 17. R x d1 and White has gained two pieces for a Rook.
Why didn't you play 31...Qxc5+ or 33...Qxc5+, and play for the win? In my mind, you have a decent advantage. Did you not feel confident with your chances for some reason?
BTW: This game did not end in perpetual check.
All I offered with 16.Qf3 was "more testing." If 16...Bf6, the test is 17.Bg5 with the ideas of c4 or Be4. Notice the squares f7 and b7 can be connected by White's queen. 16...f5 slows White down. White probably should centralize and build up.
After 31. ... Qxc5+ 32. Qd4+, White can trade Queens if Black doesn't initiate the trade. You are correct in observing that there is plenty of "play" remaining in the position. However, even with the pawn plus, Black is saddled with a pair of doubled, isolated pawns. In most of the variations I worked out, White recovers one of the pawns pretty easily. Moreover, there is no immediate way for Black to force White to trade off one or both pairs of rooks. Thus, with both pairs of rooks on the board in an open position, I decided that the chances were even.
Technically speaking, you are correct that the game did not end in perpetual check. However, if White does NOT continue to shuttle the king back and forth between f2 and f3 in response to the Queen checks, Black wins quickly because of the open g file! There are three or four nice variations to work out as an exercise...
First of all, it takes the guts of a burglar and the patience of a saint to play Black's side of this variation. I don't doubt for a minute that the line is sound, but you really need to be patient and alert to equalize.
As you say, 12...Nd5 was an error, although it wasn't obvious to me at first. I guess 12...Bd6, continuing to gradually equalize was best. So yes, 15.c4 was very strong.
I think 17...c5 was more dynamic that 17..Qc7, after which 18.f5 looks pretty good for White. Perhaps you're being just a hair too patient here! 18...c5 also looks good.
You were reluctant to exchange off the B on h6, invitingh White's Q and N into your house. But I don't think this "two-piece" attack is really dangerous, so I like 20...Bxh6 21.Qxh6 c5
White;s 24.f5 was an error, and you had what looks like a win if you had played 26..Rxe1 27.Nxe1 Ne2+
I think you might have had decent winning chances after 30...bxc5, but it wouldn't be easy. I think you settled for a draw a little too easily.
All in all, an interesting and complicated game. Well done.
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