Look at the start and the end after 5 moves. See the result it is expecting.
+0.3 Stockfish 14+NNUE
Depth 49 CLOUD
PV1 (+0.3) 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6
The horizon of the line choices (+0.3)(0.0)(0.0) (0.0) (0.0)
Same as PV 5
PV2 (+0.20 1.Nf3 e6 2.c4 Nf6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ Bd7
The horizon of the line choices (+0.3)(-0.2)(-1.1) (-6.6) (-7.9)
There is more options that favor the Black pieces.
PV3 (+0.2) 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bf4 O-O
The horizon of the line choices (+0.4)(+0.2)(+0.1) (0.0) (0.0)
Best next move (+0.4) but it is in PV 3 line, which was not considered Best first move.
PV4 (+0.1) 1.g3 e5 2.c4 c6 3.Nf3 e4 4.Nd4 d5 5.cxd5 Qxd5
The horizon of the line choices (+0.3)(+0.2)(+0.2) (+0.1) (+0.1)
Best option. It reached move 5 without changing it's mind and White still has 5 good advantages. Maybe this is the mainline.
PV5 (+0.1) 1.c4 e5 2.g3 Nf6 3.Bg2 c6 4.Nf3 e4 5.Nd4 Qb6
The horizon of the line choices (+0.3)(0.0)(0.0) (0.0) (0.0)
Same as PV 1
Note that PV 1 and PV 5 end with the same results on move 5. But it's forced to be played or else it's a balanced game.
Note that if you played the PV 3 line instead of PV1, the end result is forecasted to be (+0.4) and you still have other options.
Note that they are all candidate moves. Engine recommends the first ply not the rest of the line.
Once that ply is played, the other plys might change, because it can now evaluate one ply deeper.
The only way to make sure that in five moves it will be (+0.4) is playing out 3125 incomplete games.
https://lichess.org/study/LrpbJf0R
Look at the start and the end after 5 moves. See the result it is expecting.
+0.3 Stockfish 14+NNUE
Depth 49 CLOUD
PV1 (+0.3) 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6
The horizon of the line choices (+0.3)(0.0)(0.0) (0.0) (0.0)
Same as PV 5
PV2 (+0.20 1.Nf3 e6 2.c4 Nf6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ Bd7
The horizon of the line choices (+0.3)(-0.2)(-1.1) (-6.6) (-7.9)
There is more options that favor the Black pieces.
PV3 (+0.2) 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bf4 O-O
The horizon of the line choices (+0.4)(+0.2)(+0.1) (0.0) (0.0)
Best next move (+0.4) but it is in PV 3 line, which was not considered Best first move.
PV4 (+0.1) 1.g3 e5 2.c4 c6 3.Nf3 e4 4.Nd4 d5 5.cxd5 Qxd5
The horizon of the line choices (+0.3)(+0.2)(+0.2) (+0.1) (+0.1)
Best option. It reached move 5 without changing it's mind and White still has 5 good advantages. Maybe this is the mainline.
PV5 (+0.1) 1.c4 e5 2.g3 Nf6 3.Bg2 c6 4.Nf3 e4 5.Nd4 Qb6
The horizon of the line choices (+0.3)(0.0)(0.0) (0.0) (0.0)
Same as PV 1
Note that PV 1 and PV 5 end with the same results on move 5. But it's forced to be played or else it's a balanced game.
Note that if you played the PV 3 line instead of PV1, the end result is forecasted to be (+0.4) and you still have other options.
Note that they are all candidate moves. Engine recommends the first ply not the rest of the line.
Once that ply is played, the other plys might change, because it can now evaluate one ply deeper.
The only way to make sure that in five moves it will be (+0.4) is playing out 3125 incomplete games.
https://lichess.org/study/LrpbJf0R