411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...c6/3. Nc3/3...dxc4/4. e3/4...b5/5. Nxb5/5...cxb5
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Slav Defence rd nd bd qd kd bd nd rd pd pd pd pd pd pd pd pl pl pl pl pl pl pl rl bl ql kl bl nl rl
5...cxb5
This move bravely accepts White's bold sacrifice. Conventional chess wisdom says "The best way to refute a gambit is to accept it". Therefore, if black would have declined the gambit, white would successfully rip black's queenside apart and Black would just be worse. Now, white's queen will get trapped on a8.
Of course, the only way to try to regain the material is with 6.Qf3.
Theory table
+678Qf3
Qc7!Qxa8
Bb7!Qxa7
e5! -/+...
Nc6Qxc6+
Bd7Qf3
e5! -/=