411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. Nc3/3...dxe4/4. Nxe4/4...Bf5/5. Ng3/5...Bg6/6. h4/6...h6/7. Nf3/7...Nd7/8. h5/8...Bh7/9. Bd3/9...Bxd3/10. Qxd3/10...e6/11. Bf4/11...Qa5
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Caro-Kann Defence:Classical Variation rd kd bd nd rd pd pd nd pd pd pd pd pd qd pl pl bl ql nl nl pl pl pl pl pl rl kl rl
11...Qa5+
This move wants to provoke the advance of the c pawn, as well as discourage White from castling c3 here would achieve both goals for black.
12.
Bd2
c3