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The pin variation is 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 4.Nf6 (instead of 4...Nc6 or 4...a6) 5.Nc3 and now 5...Nc6 is the Four Knights Variation and 5...Bb4 is the pin variation.>>Ah, that's like a Classical Sicilian from a century ago, isn't it? I imagine that 5. Bd3 would be much more usual these days? But in this pin variation, you say that 6. Bd3, 6. e5 or 6. f3 are normal. But wouldn't 6. Bd2 be just as good, since there's no attack on the Nd4?