C47: Four knights. Belgrade gambit

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nd5?! probably not that great gambit, as there are plenty of moves for black after which the position is quite even and dull.

a) 5…Bc5 6.Bf4?! 0-0! unfortunatelly the threat of taking on c7 is not real. 7.Nxc7? Nh5 -+ or 7.Bxc7 Qe8 8.Nxf6+ gxf6 9.Bd3 d5 -/+.
Therefore white must play 6.Bg5 immediately but after 6..Be7 7.Bxf6 Bxf6 8.Bb5 0-0 9.Bxc6 dxc6 10.Nxf6+ Qxf6 11.Qxd4=  there is no much fun left.
Then maybe 6.Bc4!? is in the spirit of a gambit and at least white can have some fun here. Though after 6..h6! black should be ok.

b) 5..Nb4! 6.Nxd4 Nxe4! (or 6..Nbxd5!? if you want to avoid all those crazy sharp lines 7.exd5 Nxd5 gives black at least equality) 7.Nb5 Nxd5 8.Qxd5 Qe7 9.Nxc7+ Kd8 10.Bf4 d6 11.0-0-0 Kxc7 and white doesn´t have full compensation. E.g. 12.Re1 f5 13.f3 g5 14.Qc4+ Kb8 15.Be3 Nf6 16.Bxa7+ Rxa7 17.Rxe7 Bxe7 and active pieces should be more than queen. Or 12.Qc4+ Kb8 13.h4 Qe6.

c) 5..Nxe4! is being considered as a refutation. 6.Qe2 f5 7.Ng5 (6.Bf4 Bd6!? or 6…d6 7.0-0-0 Ne7) d3! 8.cxd3 Nd4 9.Qh5+ g6 10.Qh4 c6 11.dxe4 cxd5 12.exd5 Bg7!
(12..Qa5+?! 13.Kd1! Qxd5 14.Bc4! Qxc4 15.Re1+ Be7 16.Rxe7+ Kxe7 17.Ne4+ Ke6 18.Qf6+ Kd5 19.Nc3+ Kc5 20.b4+ Kxb4= perpetual check for white)
13.Kd1 h6 14.Nf3 Qxh4 (b6!? also working) 15.Nxh4 Kf7 16.Be3 f4! 17.Bxd4 Bxd4 18.Bd3 Rg8 19.d6 Kf6 20.Re1 b6 and black is doing ok.
To avoid this main line with Qe2-Ng5, white can try a new territory and go for 5…Nxe4 6.Bd3!? Nc5 7.0-0 Ne6 8.Re1 with compensation.

d) 5..Be7 6.Nxd4 Nxd5 7.exd5 Nxd4 8.Qxd4 0-0 9.Be2 Bf6 10.Qd3= does not give white anything, it is a drawish position.
So maybe 6.Bc4!? again 0-0 7.0-0 Nxe4 8.Re1 Nf6 9.Nxe7+ Nxe7 10.Qxd4 with compensation for the pawn.

A22: English (A22). Bellon gambit

1. c4 e5 2. Nc3 Nf6 3. Nf3 e4 4. Ng5 b5!?
a) 5.Ngxe4?! Nxe4 6.Nxe4 bxc4 and black is fine, with d5 coming.
b) 5.d3!

C63:  Jaenisch Gambit

1. e4 e5 2. Nf3 Nc6 3. Bb5 f5!?
a) 4. exf5?! e4 5.Qe2 Qe7 6.Bxc6 bxc6! 7.Nd4 Nf6 and black is slightly better.
b) 4.Nc3!

C45: Scotch Game: Classical, Millennium Variation

a) 7. Nb5 Bxe3 8. Nxc7+ Kd8 9. Nxa8 Bh6! 10. f3 Nf6 11.Qd6 Bb1! and black is doing well in what has been considered as a refutation line (7.Nb5).
b) 7.Qf3 Bxd4 8.cxd4 d5!? 9.exd5 Nb4 with compensation. 10.Bb5+ c6 11.dxc6 bxc6 12.Ba4 Ba6 or 7…d6 8.Nd2 Nf6=.
c) 7.Qd3 Nf6 8.Nb5 Bxe3 9.Qxe3 Kd8 10.f3 Re8 (or h5-Qh6 for an endgame) and black is doing fine as well.

C40: Latvian gambit

1. e4 e5 2. Nf3 f5? this gambit is a bad one.3.Nxe5! the best move.

a) 3…Nc6 4.Qh5+! g6 5.Nxg6 Nf6 6.Qh3! Rg8 7.Nxf8 Kxf8 (if you went 6.Qh4, then here is possible to play Rg4 giving some unnecessary chances to black) 8.e5! Nxe5 9.d4 +-
b) 3..Nf6 4.Bc4 Qe7 5.d4 +-
c) 3…Qf6 main black line 4.Nc4! fxe4 5.Nc3 Qf7 6.Ne3 c6 7.d3!! this counter-gambit gives white winning compensation. 7…exd3 8.Bxd3 d5 9.0-0 Bc5 10.b4! Bxb4 (10..Bd6 11.Re1) 11.Ncxd5! cxd5 12.Nxd5 Bc5 13.Re1+ +-

A02: Bird, From gambit

1.f4 e5! 2.fxe5 d6 3.exd6 Nf6!? 4.dxc7 Qxc7 with attack. 5.Nf3 Bd6 or Ng4
4.Nf3 Ng4! with attack
Best defence probably 4.dxc7 Qxc7 5.Nf3 Ng4 6.d4 Bd6 7.Qd3! Nc6 8.Na3! Nb4 9.Qe4+ Kf8 unclear

C35: King’s Gambit Accepted, Cunningham defence

1.e4 e5 2.f4 exf4 3.Nf3 Be7 Cunningham defence

a) 4.Nc3 Bh4+ 5.Ke2 d5 6.Nxd5 Nf6 7.Nxf6+ Bxf6 8.d4 unclear

b) 4.Bc4 Bh4+ 5.Kf1 Be7
(5.g3?! Bertin gambit fxg3 6.0-0 d5! (gxh2 7.Kh1 with compensation) 7.Bxd5 Nf6 8.Nxh4 Nxd5 black is better)
6.Nc3 Nf6 7.Qe2 0-0 8.d4 looks ok.

b1) 4.Bc4 Nf6 Modern Cunningham 5.e5 Ng4

1. e4 e5 2. f4 exf4 3. Nf3 Be7 4. Nc3 Bh4+ 5. Ke2 d6 6. d4 Bg47. Bxf4 Nc6 8. Qd3 Nge7 9. Kd2 Bf6 10. e5 Bf5 11. exf6 Bxd312. fxe7 Qd7 13. Bxd3 Nxe7 14. Raf1 0-0 
15. Kc1 a6 16. h4 b517. h5 b4 18. Nd1 Nd5 19. Bd2 a5 20. Nh4 c6 21. Rf3 Nc722. Nf5 Ne6 23. d5 cxd5 24. Nde3 Nc5 25. Nxd5 Nxd3+ 26. Rxd3 Rae8 27. Rf1 f6 
28. h6 g6 29. Nfe3 f5 30. Nc4 f4 31. Rxf4 Rxf4 32. Bxf4 Re1+ 33. Kd2 Re6 34. b3 Qd8 35. Kc1 g5 36. Rg3 Rg637. Be3 Kf7 38. Rf3+ Ke6 39. Ncb6 Rxh6 40. Bd4 g4 
41. Rf1 Qh4 42. Nc7+ Ke7 43. Kb2 Qg5 44. a4 bxa3+ 45. Kxa3 Qg6 46. c4 a4 47. Ncd5+ Ke8 48. Re1+ Kd8 49. Re7 Qd3 50. Bc3 1-0

B21: Morra gambit

1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3

a) 4…a6 5.Nf3 e6 6.Bc4 b5 7.Bb3 Bb7 8.0-0 Nc6!
9.a4 b4 10.Nd5 Na5! 11.Bg5 Be7 12.Nxe7 Nxe7 13.Bc2 d5=

a1) 8…b4 9.Nd5 exd5 10.exd5 Bd6 11.Re1+ Kf8 12.Qd4 a5 13.Bg5 Nf6 14.Nd2 h6 15.Bh4 Ra6! 16.Ne4 Qb6=
10.Bf4!? or 13.Bf4!?

b) 4..Nc6 5.Nf3 d6 6.Bc4 e6 7.0-0 Be7 8.Qe2 Nf6 9.Rd1 e5 10.Be3 0-0

11.h3 Be6! 12.Bxe6 fxe6 13.b4 Nxb4! 14.Qb2 Nc6 =/-
11.b4 Bg4!
11.Rac1 Be6 12.b4 Bxc4 13.Qxc4 Rc8 14.Qb3 a6 15.a4 h6

b1) 8..a6 9.Rd1 Bd7! 10.Bf4 e5 11.Be3 Nf6 12.Nd5 b5 13.Nxf6+ Bxf6 14.Bb3 Be7
b1a) 8..a6 9.b4? Nf6! 10.Rd1 b5! =/- or Qc7!?
b1b) 8..a6 9.Bf4 e5 10.Be3 Nf6 11.Rfd1 0-0 12.Rac1 Bd7=

A00. Grob opening 1.g4

1. g4 d5! 2. Bg2 c6! 3. c4
3. g5 h6 4. h4 hxg5 5. hxg5 Rxh1 6. Bxh1 e5
3. h3 h5 4. g5 e5 5. d4 e4 6. f3 f5
3… Bxg4 4. Qb3 e6 5. Qxb7 (5. cxd5 exd5 6.
Qxb7 Nd7) 5… Nd7