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i_play_slowly 82 ( +1 | -1 )
Black's responses to 1.e4 - revised In my last set of stats, I compared victories for White with victories for Black, without considering draws; this set of stats takes wins and draws into account. I am looking solely at the database for Gameknot's +1900 games, which, of course, is not necessarily any indication of the effectiveness of these openings at higher levels of play. I do not mean to suggest that the reader should adopt any of these openings on the basis of these stats. They appear in descending order of Black's successes:
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1) The database includes 4,555 games with 1c5, Black earning 46% of the points.
2) The database includes 1,372 games with 1e6, Black earning 45% of the points.
3) The database includes 3,667 games with 1e5, Black earning 40% of the points.
4) The database includes 307 games with 1d5, Black earning 35% of the points.
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I have not looked at the stats for 1...c6, 1...d6, or 1...Nf6.
anaxagoras 61 ( +1 | -1 )
I think you'd want at least 20,000 games with each Black response to have an idea about approximate winrates. If you want accuracy, try a sample size of 50,000 or better. It really requires some experience with statistics (like bonsai) or even <gasp> gambling to have an appreciation of why 5,000 examples is a small drop in the bucket, and shouldn't be taken seriously.
The GK database also does not keep track of the relative ratings of the players who are contained in it. Suppose that Black averages a marginal 40 more ELO points with 1...c5. The winrate for Black with c5 could be inflated by as much as 3-5%!!!
odonata 9 ( +1 | -1 )
Do not value too much the first moves... mind the many transpositions between openings in the opening...
f.e. 1.e4 c5 2.Nf3 d6 looks quite the same to 1.e4 d6 2.Nf3 c5