|White to make move 21|
The material is even and the remaining minor piece bishops are of the same color. Opposite color bishops make for a more draw-ish game as each side has the exact same power over half the squares on the board.
But in this situation, the side with more space and the more active pieces will have the advantage.
White has active rooks and a better placed Queen. Igor3000, my laptop Grandmaster agrees by giving White a full 1 pawn advantage here.
But how to convert that to a win?
21. Rd7 Qe8
22. Rcd1 ?! …….
Igor was not a fan of this, sighting that 22. Qd5 not only guarded the rook at d7, but still attacked the rook at a8, and now attacks the bishop at e5 and X-rays the King on g8. White's advantage slips slightly to +.8.
22. ….. h6
23. Qg4 Qe6
24. Qxe6 fxe6
25. Re7 Rfe8
26. Rdd7 Kf8?
Black needed to break up White's battery on the seventh rank with 26. ….Rxe7 27. Rxe7, Bf6 28. Rxe6, Rc8 and a draw was still possible. Instead White is now up 2 pawns!
27. Rf7+ Kg8
28. Rxa7 Rxa7
29. Rxa7 Rd8
30. g3 b5
31. Kg2 Kh7 ?!
Black needed to trade his less effective bishop for White's with 31. …..Bd4. White up +2.2
32. Ra6 Rd6??
Black lost his nerve, which is understandable when you consider how bad his situation was. White is +5.
33. Rxd6 Bxd6
34. a4 bax4
35. bxa4 Bc7
36. Bd2 Black resigns
Black knows he cannot simultaneous guard his isolated e-pawn and watch White's a-passed pawn.