So they can play the Berlin Defense! Seriously, though, what you're going to find with chess openings, is that there is a vast array of playable positions. And, generally, the higher ranked players often choose the riskiest and most complex opening variations when they're trying for a win.
Why does white let black take the pawn in the Berlin defence after casting?
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Why does white let black take the pawn in the Berlin defence after casting? E4 e5 nf3 nc6 bb5 nf6 0-0