Which one?
Reti Opening.
Nobody knows for sure.At Yekaterinburg Candidates' the Ruy Lopez scored better than the Giuoco Pianissimo Italian.
Ruy Lopez
I play Ruy Lopes not because I like it or it's so great, but because it is too complex and I want to learn all its aspects by playing it, then I believe I gain much middle game knowledge (as it is a base bone of many existing middle game ideas).
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Which one?