411 REFERENCE · Wikibooks
Custom Chess Theory/1.e4/1...c6/2.d4/2...d5/3.Ne2
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
3. Ne2 — Karkopolski Gambit
3. Ne2 is an unusual developing move that supports the kingside and keeps the f-pawn available. In this line, White accepts a slower development in exchange for a flexible setup, forming the Karkopolski Gambit.
3...dxe4 allows Black to capture the e4-pawn and temporarily gain material.
An independent line is 1. e4 c6 2. d4 d5 3. Ne2 dxe4 4. Nbc3 Nf6 5. Ng3, when White develops actively and prepares to attack Black's extra pawn.
The Karkopolski Gambit is characterized by 1. e4 c6 2. d4 d5 3. Ne2, with White choosing an unusual knight development and allowing a sharp continuation against Black's Caro-Kann setup.