This position is really fascinating (to me, anyway). No draws yet!!
The idea of
41...Nxe5 42.Ne7+ Kh7 43.Qxe5 Nd7 works. This might even be losing for White. The knight on f6 defends everything, and the threat of the knight coming to g4 ties White up. Best is probably
44.Qe4+ g6 45.Qf4 (White wants to trade queens to stop the threats, and he can defend the queenside with the knight--it might not be totally obvious, but Nc6xa5 and b3 hold, as his king gets there first; again, it's the White king that's in danger if the queens stay on)
Qd1+ 46.Kh2 Kg7 (and now I think White needs to stop the threat of Ng4 with)
47.Nc6 Nf6 48.Ne5 but Black is completely out of danger and has time for
Qxa4:
Position after 48...Qxa4
White has no threats, and Black is just up a free pawn. It's a long line, but very forcing. If you look at White's alternatives, you see the trouble he's in: e.g.,
44.Qxa5 Nf6 45.Qb5 Ng4 46.Qf1 and Black is just going to promote the b-pawn...you can check 44th move alternatives, but the White queen doesn't have a good square.
Position after 46.Qf1
*
The result of this analysis is just to prove that
43.dxe5 is going to be best for White. Then forced is
Nd5 44.Nxd5 and I'm just not sure what's best here for Black yet, but I might as well think about this on my opponent's time. Black still has the draw, but playing on (whether by Qxd5 or exd5) looks tempting. (I've taken a quick look at these, but no definite opinions formed yet--other than that White has excellent chances of securing the perpetual...)
Position after 44.Nxd5
I know these posts probably have too many variations to be very readable, but we're at the point where you can calculate these long lines with some confidence, so I'm trying to share some of that work.
One downside, I now realize from the length of these spoilers, is that my opponent will definitely know to be on the lookout for some tactics. Whatever, bring on the marginally-better queens-and-pawns endgame. We can probably keep this game going until 2013.