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I might try the Latvian gambit out sometime for fun , but it reminds me of a gambit defence .I sometimes play but is lacking against higher rated opponents. Thats the Colorado Counter e4-nc6, nf3-f5, aka the lean variation of the nimzovich defence . Fun exciting games but in tournment play a wouldn't suggest it. I'll have to try the Latvian out for fun, but somehow I doubt it would work any better.