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Chess Opening Theory/1. e4/1...a6/2. Bc4
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St. George Defence
2.Bc4
It's tempting for Black to play /2...b5/ but it's a trap : 3. Bxf7+ Kxf7 4. Qh5+!. If now 4. ... Kf6?? then 5. Qf5#, 4. ... Ke6?? transposes to the same line after 5. Qd5+ Kf6 6. Qf5# checkmate. The only evasion of mate is 4. ... g6 5. Qd5+ any 6. Qxa8 and White wins a rook.
Instead, /2...e6/ is sound. 2. Nf6 is good too : 3. e5 d5
Theory table
.
'1.e4 a6 2.Bc4'
2
...e6
=
...b5
+/-
References
St. George Defence