411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...Nf6/2. e5/2...Nd5/3. d4/3...b5/4. Bxb5/4...c5/5. dxc5/5...Qa5
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O'Sullivan Gambit rd nd bd kd bd rd pd pd pd pd pd pd qd bl pl nd pl pl pl pl pl pl pl rl nl bl ql kl nl rl
Alekhine Defense: O'Sullivan Gambit
6. Nc3? does not save the bishop, because Black can capture with their knight. Furthermore, 6. c3? may appear to work because after Black captures the bishop, White can recapture the knight, but 7...Bb7! skewers White's g-pawn and wins the trapped rook. Thus, White's best move is 6. Nd2, conceding their bishop.
Theory table
.
'1.e4 Nf6 2.e5 Nd5 3.d4 b5 4.Bxb5 c5 5.dxc5 Qa5+'
3
...
d6
=
'1.e4 Nf6 2.e5 Nd5 3.d4'
3
...
e6
=
References
Alekhine's Defence