411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Bb4/3. Nxe5/3...Nf6
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not chess opening theory== 3...Nf6 — Radium Gambit Accepted: Lubin Variation ==
After 1. e4 e5 2. Nf3 Bb4 3. Nxe5, White accepts the Radium Gambit by capturing the e5-pawn.
3...Nf6 develops the knight and attacks the knight on e5, forcing White to decide how to respond while Black prepares to recover the sacrificed pawn.
4. Nc3 develops another piece and supports the knight on e5.
4. d3 supports the knight indirectly and prepares further development.
4. Nf3 retreats the knight to safety, although White gives up some of the activity gained from capturing the pawn.
Downsides: Black has sacrificed the e5-pawn and must use ...Nf6 to challenge the knight. White can try to hold the extra pawn while completing development.
An independent line is 1. e4 e5 2. Nf3 Bb4 3. Nxe5 Nf6 4. Nd3 Be7 5. f3 d5.
The Radium Gambit Accepted – Lubin Variation is characterized by 1. e4 e5 2. Nf3 Bb4 3. Nxe5 Nf6.