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Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nd4/4. Nxe5/4...Qg5/5. O-O
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Blackburne Shilling gambit Italian Game
5. O-O
White resists the temptation to take the 'free' pawn on f7 but instead calmly castles, sacrificing their e5 knight while defending g2 and relocating their king to safety.
5...Qxe5 is obviously the best move. Black captures the free knight and is now up 2 points of material, but they are only slightly better as White will get developmental compensation after 6. c3 followed by 7. d4.
Theory table
1 5...Qxe5 6. c3 Nc6 7. d4 Qe7 8. e5 d6 unclear Blackburne Shilling gambit 5. ... ... 6. ... ... 7. ... Qxe4?? 8. Re1! +- 5. ... ... 6. ... ... 7. ... Qf6?! 8. f4 unclear 5. ... ... 6. ... Ne6 7. d4 Qxe4 8. Re1 Qc6 unclear 5. ... ... 6. ... Bd6!? 7. g3 Ne6 unclear 5. ... ... 6. ... ... 7. cxd4?? Qxh2# 0-1
References
See also
Blackburne Shilling Gambit