The one you don't play.
Which gambit is the most effective?
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I like the scotch gambit, it's very solid. Queen's gambit is good. Stafford gambit is deadly, especially at 800 level bullet.
Good Gambits for beginners to intermediate:
Blackmar-Diemer
1. d4 d5
2. e4
Danish Gambit
1. e4 e5
2. d4 exd4
3. c3 dxc3
4. Bc4 cxb2
5. Bxb2
Evans Gambit
1. e4 e5
2. Nf3 Nc6
3. Bc4 Bc5
4. b4
Staunton Gambit
1. d4 f5
2. e4 fxe4
3. Nc3
Urosov Gambit
1. e4 e5
2. Bc4 Nf6
3. d4
Vienna Gambit
1. e4 e5
2. Nc3 Nf6
3. f4
Queen's Gambit
1. d4 d5
2. c4
Source: https://www.youtube.com/watch?v=S9N6Bo7BBPg
The best gambits are:
Queen's Gambit and Catalan for white, Two Knight's Defense and Marshall Attack for black.
Which Gambit is the most effective?