user47: Besides the Queen's Gambit (which isn't really a gambit anyway), which gambits have been most successful as far as winning percentage and usage at high levels of play?

user132: According to these statistics from 4 million games, the Marshall Gambit of the Semi-Slav defense is the most successful with 58.4% wins. I only counted gambit openings that had more than 1000 occurrences in the database.
The least successful gambit appears to be the Latvian Gambit with only 41.1% wins.
Note that since the database does not discriminate against older games, the statistics may not necessarily reflect the possible outcome of an opening if it were played today.

47: <p>Besides the Queen's Gambit (which isn't really a gambit anyway), which gambits have been most successful as far as winning percentage and usage at high levels of play?</p>
 132: <p>According to <a href="http://studimonetari.org/edg/" rel="noreferrer">these statistics</a> from 4 million games, the Marshall Gambit of the <a href="http://en.wikipedia.org/wiki/Semi-Slav_Defense" rel="noreferrer">Semi-Slav</a> defense is the most successful with <a href="http://studimonetari.org/edg/marshall6.html" rel="noreferrer">58.4% wins</a>. I only counted gambit openings that had more than 1000 occurrences in the database.</p>

<p>The least successful gambit appears to be the <a href="http://en.wikipedia.org/wiki/Latvian_Gambit" rel="noreferrer">Latvian Gambit</a> with only <a href="http://studimonetari.org/edg/lettone.html" rel="noreferrer">41.1% wins</a>.</p>

<p>Note that since the database does not discriminate against older games, the statistics may not necessarily reflect the possible outcome of an opening if it were played today.</p>
