Victory Hangs on Every Move

After 39. Ne3, White is doing well particularly with a passed pawn on e6. White also threatens Black's Bishop on d5. Black commits an inaccuracy with 39... Bc6. Black should have played 39... Bf3 preventing White's next move 40. Nd1 defending the b2 pawn. Black came back with 40...Bf3 attacking the defender whose elimination will lead to the loss of White's queenside pawns. It seems hopeless for White.  

Here, I resigned. But, it was premature. The position could have been saved by an exchange of pieces in playful, tit for tat fashion. Perhaps, my brain couldn't conceive and process the mechanism at the time, drawing a costly blank. The saving move was 41.Be3, attacking the Black bishop on c1. 

If 42...Be3, then 43.Ne3 and White's black-squared pawns are safe. If ...Be1, then 43. Bc1 taking out the attacker.