White: moonbus, Black AppleChess, annotations by moonbus
1... e5 2. Ng1f3 Nb8c6 3. Bf1b5 a6 4. Bb5xc6 dxc6
Spanish Exchange Variation, C68.
5. d4 exd4 6. Qd1xd4 Qd8xd4 7. Nf3xd4 Bc8d7
This opening leads to an early endgame in which each side has a clear objective: White will play to accentuate his king-side pawn majority, Black the queen-side. There are two main strategic considerations: 1) Black has the bishop pair, which is to Black's advantage. 2) White's pawn structure is sound and his 4 king-side pawns can break through against Black's 3 pawns, whereas the Black queen-side majority is hobbled and cannot break through due to the doubled pawns. Black must therefore either a) undouble his c-pawns, or b) break up the White queen-side with pieces. The chances are reckoned to be even.
This presents Black with a dilemma: either give up the bishop pair by exchanging on f5, or submit to backward development, since the dark-squared bishop cannot move so long as the White knight occupies f5.
11... Bd7xf5 12. exf5
This ruptures White's king-side pawn majority; so now, both sides have much the same task: try to undouble the doubled pawns, &/or break up the opposing side with pieces.
White offers the h-pawn in exchange for active piece play.
15... Bd6xh2 16. Ne4g5
So far we have duplicated the game Ruslan Musalov  vs Nikolai Shukh , 2011 Russian Chp.
At this point, Shukh played NxBe3; the game went on to 78 moves with White eventually winning a difficult K&R vs K&N ending. My opponent, AppleChess, diverges here, so we are out of the book from here on.
Forcing the Black knight to move, allowing White to exchange rooks, and forcing Black to advance the f-pawn (or lose it outright). This will create a weak square at e6, which the White knight will occupy and from which it cannot be budged.
17... Nd5xe3 18. Rd1xd7 Kc8xd7 19. fxe3
White has now accomplished one part of his task: he has undoubled his pawns.