I was playing a game against a FIDE master which started with the Polish defence, Spassky gambit: 1. d4 b5 2. e4 Bb7 3. Bxb5 f5
[White "Bad_Bishop"] [FEN ""] 1. d4 b5 2. e4 Bb7 3. Bxb5 f5
What are the main plans and variations?
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I have the book "1.d4 Volume 2" by Grandmaster Boris Avrukh in front of me. Not the line you're looking at but Avrukh says 3.Bxb5 Bxe4 4.Nf3 Nf6 5.0-0 e6 6. c4 Be7 7.Nc3 Bb7 is perfectly playable for Black.
Avrukh's mainline vs the Polish defence is 1. d4 b5 2. e4 Bb7 3. Bd3 (solidifying the centre and aiming to prove the centre pawns are better than the wing pawns.) Nf6 (3...a6 4.Nf3 transposes to the St. George defense) 4. Nd2 e6 5. Ngf3 a6 6. 0-0 c5 7.dc Bxc5 8. e5 Nd5 9. Ne4 Be7 10. a4 b4 11.Nfd2! (heading for c4 and and freeing the Queen on the d1-h5 diagonal) ... and eventually += on move 18. The main plan for White is to play with pieces in the free space in the centre and possibly aim to attack on the Kingside or fill the holes left behind in Black's pawn structure. For more details buy the book.
Your best bet here is 4.Nh3 so your opponent doesn't get a tempo with 4. ...fxe4
If he takes with his pawn 4. ...fxe4 You can simply continue 5.Nc3 followed by 0-0 and you're clearly better.
If he takes with his bishop 4. ... Bxe4 you can with no fear proceed with 0-0 and your knight will always pose a threat such as Ng5 attacking his bishop and with pressure on f7 and even e6 if he moves his d pawn, or Nf4 where your knight gets a secure,strong position but in that case you should be careful about his g pawn advancing. All things considered white is better in this position.
It is probably the worst response possible. You can accept the pawn with 4.exf5. Then, Black will play 4...Bxg2, then 5. Qh5. Black's kingside weaknesses will result in loss of material. Black is forced to play 5...g6, The following [best, probably] moves are:
When Black's bishop captures on h1, then you can trap it with f2-f3. Stockfish evaluates the position at depth 22 as +2, approximately.
If Black does not go ahead with his plan of winning the exchange, with 4...Nf6 (prevents Qh5+), then you play 5.Nf3. Your rook is safe, you have more space, and Black's kingside has been weakened. Stockfish evaluates the position as +4.4!?