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Masters Database
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I paid $15 on 365 to get the Masters Database in Opening Explorer. It seems much better, but you can switch to the Big Database to look at certain gambits or when the Masters line runs out. The Masters Database seems to have mostly games of 2400+, not marginal masters.
I don't play anywhere near that level, but it is usually more useful to see what is closer to correct play.
Any opinions? Are there similar or better resources?