In case of 5. Re1 the main line goes 5… Nf6 6. e5 Nd5 7. Nc3 Nc7 8. Bxc6 dxc6, while against the alternative 5… e5, besides the quiet 6. Bxc6 dxc6 7. d3 white also has a more challenging Gurgenidze Variation (6. b4).
Another popular option is 5. c3, where after 5… Nf6 all of the following moves deserve attention: 6. Re1, 6. e5, 6. Qe2, 6. Qa4 and also 6. d4 (Lutikov Gambit). Move 5… e5 should be avoided by Black, since White gains a strong initiative in the Gufeld Gambit (6. d4).
[Diagram: White to Move] White needs to react forcefully if he wants to punish Black for his uncastled king. How would you proceed?
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