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• Roman numerals converterConvert numbers to Roman numerals and back, with the full reference table and the subtraction rules explained.
• Number base converterConvert between binary, decimal, hexadecimal and octal in any direction, with a reference table and why each base exists.
• Morse code translatorTranslate text to Morse code and back, with the full alphabet and the story of the code that refuses to die.
• Chess opening statisticsWhite wins, draws and Black wins for the 27 main chess openings, measured across 2,658,585 real games on Lichess.
• Sicilian Defense (1.e4 c5)The Sicilian Defense in real numbers: 45.9% White wins across 388,917 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• French Defense (1.e4 e6)The French Defense in real numbers: 47.8% White wins across 202,192 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Caro-Kann Defense (1.e4 c6)The Caro-Kann Defense in real numbers: 45.4% White wins across 93,081 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Italian Game (1.e4 e5 2.Nf3 Nc6 3.Bc4)The Italian Game in real numbers: 50.6% White wins across 88,443 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Ruy Lopez (1.e4 e5 2.Nf3 Nc6 3.Bb5)The Ruy Lopez in real numbers: 52.1% White wins across 73,519 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Scandinavian Defense (1.e4 d5)The Scandinavian Defense in real numbers: 49.7% White wins across 111,932 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Pirc Defense (1.e4 d6)The Pirc Defense in real numbers: 47.8% White wins across 58,616 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Alekhine's Defense (1.e4 Nf6)The Alekhine's Defense in real numbers: 44.6% White wins across 30,110 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Scotch Game (1.e4 e5 2.Nf3 Nc6 3.d4)The Scotch Game in real numbers: 52.7% White wins across 40,877 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• King's Gambit (1.e4 e5 2.f4)The King's Gambit in real numbers: 55.0% White wins across 68,798 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Vienna Game (1.e4 e5 2.Nc3)The Vienna Game in real numbers: 54.1% White wins across 20,015 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Queen's Gambit (1.d4 d5 2.c4)The Queen's Gambit in real numbers: 54.6% White wins across 154,562 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Slav Defense (1.d4 d5 2.c4 c6)The Slav Defense in real numbers: 51.3% White wins across 41,842 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Queen's Gambit Declined (1.d4 d5 2.c4 e6)The Queen's Gambit Declined in real numbers: 52.1% White wins across 45,803 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• King's Indian Defense (1.d4 Nf6 2.c4 g6 3.Nc3 Bg7)The King's Indian Defense in real numbers: 47.5% White wins across 16,082 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Nimzo-Indian Defense (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4)The Nimzo-Indian Defense in real numbers: 46.0% White wins across 13,554 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Grünfeld Defense (1.d4 Nf6 2.c4 g6 3.Nc3 d5)The Grünfeld Defense in real numbers: 44.6% White wins across 6,847 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• London System (1.d4 d5 2.Bf4)The London System in real numbers: 51.3% White wins across 18,987 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• English Opening (1.c4)The English Opening in real numbers: 51.2% White wins across 97,752 Lichess games, the 5 most common replies, the rating effect and the opening's history.
• Réti Opening (1.Nf3 d5 2.c4)The Réti Opening in real numbers: 56.5% White wins across 6,918 Lichess games, the 5 most common replies, the rating effect and the opening's history.