Passed pawns must be pushed.
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[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "NotionalBb5, White"]
[Black "NotionalBb5, Black"]
[Result "*"]
[BlackElo "unknown"]
[ECO "B01"]
[TimeControl "0"]
[WhiteElo "unknown"]
1. e4 { B01: Scandinavian Defence } 1... d5 2. exd5 Nf6 3. Bb5+ Bd7 4. Bc4 Bg4 5. f3 Bc8 { 5... Bf5 is not really playable because after 6. Nc3 Nbd7 7. Qe2
(planning for a timely check on b5 in some lines) 7... Nb6 8. Bb3 Qd7 9. d6
cxd6 10. a4 a5 11. d3 Be6 12. Bxe6 Qxe6 13. Qxe6 fxe6 14. Nb5 Kd7 15. c4
white enjoys better play with his Knight post and Queen side pawn majority.
Another line good for white is Fischer-Bergrasser, Monaco 1967 5... Bf5 6. g4
Bc8 7. Nc3 Nbd7 8. g5 Nb6 9. Bb5+ Nfd7 10. f4 Nxd5 11. Nxd5 c6 12. Bc4 cxd5
13. Bxd5. White is a clean pawn up. } 6. Nc3 Nbd7 7. Qe2 Nb6 8. Qd3 g6 9. Nge2 Bg7 10. Ng3 O-O 11. b3 a6 12. O-O Nxc4 13. bxc4 b5 14. Rb1 bxc4 15. Qxc4 e6 16. dxe6 Bxe6 17. Qa4 Nd5 { The game might continue 18. Nxd5 Qxd5 19. a3
leaving white with a slight advantage. } *