What is the technique to win and endgame R vs B + B? [title "R vs B+B"]
[fen "8/4rpkp/6p1/8/8/4BBP1/5PKP/8 w - - 0 1"]


The engine says that this endgame is winning for white(+2.5). Is there a technique that could be used to win this for white. I understand that the ideal position for black to draw this game would be to have 0 pawns on the board which would then with the best play be a draw. If there was a passed pawn in this for white the escorting of the pawn to the final rank would be achieved with the bishop maneuvers. However, in this case, the pawns are on the same side of the board. Are the engines missing some sort of fortress position or is there a winning technique?
As a complement to previous answers, notice that although this endgame should be a theoretical win for the bishops, it is not as straightforward a technical task as one might think.

Even at the highest level, in a World Championship Match, Black has been able to save his skin. The stakes were very high, since this rapid game was played during the tiebreak when the players were still tied.

 [FEN ""]
 [Event "Carlsen - Karjakin World Championship Match"]
 [Site "New York, NY USA"]
 [Date "2016.11.30"]
 [EventDate "2016.11.11"]
 [Round "13.2"]
 [Result "1/2-1/2"]
 [White "Magnus Carlsen"]
 [Black "Sergey Karjakin"]
 [ECO "C50"]
 [WhiteElo "?"]
 [BlackElo "?"]
 [PlyCount "167"]

 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.O-O Nf6 5.d3 O-O 6.a4 a6 7.c3 d6
 8.Re1 Ba7 9.h3 Ne7 10.d4 Ng6 11.Nbd2 c6 12.Bf1 a5 13.dxe5 dxe5
 14.Qc2 Be6 15.Nc4 Qc7 16.b4 axb4 17.cxb4 b5 18.Ne3 bxa4
 19.Rxa4 Bxe3 20.Bxe3 Rxa4 21.Qxa4 Nxe4 22.Rc1 Bd5 23.b5 cxb5
 24.Qxe4 Qxc1 25.Qxd5 Qc7 26.Qxb5 Rb8 27.Qd5 Rd8 28.Qb3 Rb8
 29.Qa2 h6 30.Qd5 Qe7 31.Qe4 Qf6 32.g3 Rc8 33.Bd3 Qc6 34.Qf5
 Re8 35.Be4 Qe6 36.Qh5 Ne7 37.Qxe5 Qxe5 38.Nxe5 Ng6 39.Bxg6
 Rxe5 40.Bd3 f6 41.Kg2 Kh8 42.Kf3 Rd5 43.Bg6 Ra5 44.Ke4 Rb5
 45.h4 Re5+ 46.Kd4 Ra5 47.Kc4 Re5 48.Bd4 Ra5 49.Bc5 Kg8 50.Kd5
 Rb5 51.Kd6 Ra5 52.Be3 Re5 53.Bf4 Ra5 54.Bd3 Ra7 55.Ke6 Rb7
 56.Kf5 Rd7 57.Bc2 Rb7 58.Kg6 Rb2 59.Bf5 Rxf2 60.Be6+ Kh8
 61.Bd6 Re2 62.Bg4 Re8 63.Bf5 Kg8 64.Bc2 Re3 65.Bb1 Kh8 66.Kf7
 Rb3 67.Be4 Re3 68.Bf5 Rc3 69.g4 Rc6 70.Bf8 Rc7+ 71.Kg6 Kg8
 72.Bb4 Rb7 73.Bd6 Kh8 74.Bf8 Kg8 75.Ba3 Kh8 76.Be6 Rb6 77.Kf7
 Rb7+ 78.Be7 h5 79.gxh5 f5 80.Bxf5 Rxe7+ 81.Kxe7 Kg8 82.Bd3 Kh8
 83.Kf8 g5 84.hxg6 1/2-1/2


White pieces were played by a grandmaster who is considered as one of the very best endgame players in History.