Hidden diamonds
When you get a database such as Mega 2017, it is easy to just think of it as a monster database with millions of games (which it is), with tens of thousands of player photos (which it has), and tens of thousands of commented games (which it also has), but to stop there without a bit of digging is to miss out on a diamond mine to put all those in South Africa to shame.
It goes almost without saying that will you find within it games dating back to the 15th century, the birth of the modern game (in terms of rules), as well as all the games known thereafter. What you may not realize is that a huge number of these Golden Oldies not only come with annotations, but annotations that are by the players themselves or contemporaries. You will also find a significant number that can only be described as surprising!
Below is a small sample taken pretty much at random, with the exception that an effort was made to provide some variety in players and annotators. You will easily find thousands of others of similar quality.
Evergreen
Adolf Anderssen was a German master from the 19th century whose play was characterized by incredible imagination and derring-do. Although he famously lost important matches to Morphy and later Steinitz, he was easily one of the world’s greatest players of his age, and for nearly 30 years, from 1851 till his death in 1879, he won over half the tournaments he played in, ahead of top contemporaries.

Adolf Anderssen's preparations for the 1851 London International Tournament produced a surge in his playing strength: he played over 100 games in early 1851 against strong opponents.
His most famous games are the “Immortal Game” and the “Evergreen”, but needless to say many books could be made just of his tactical prowess. Below is a game against Carl Mayet, a match he played in 1851, with a breathtaking finish.
The notes are by the top Austrian born GM Eliskases, who later immigrated to Argentina at the onset of World War II.
Adolf Anderssen - Carl Mayet
(Annotations by Erich Eliskases)

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1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.0-0 d3 7...dxc3 8.Qb3 Qf6 9.e5 7...d6 8.cxd4 Bb6 9.Nc3 8.Ng5 Nh6 9.e5 Nxe5?! 10.Re1 Qe7 11.f4! Bb6+ 11...Qc5+ 12.Kh1 Qxc4? 13.Rxe5+ Kd8 ≤13...Kf8? 14.Qe1! g6 15.Re8+ Kg7 16.Qe5+ f6 17.Qe7+ Nf7 18.Rxh8 Kxh8 18...Kh6 19.Rxh7# 18...fxg5 19.fxg5 19.Qf8# 12.Kh1 Nhg4 13.Nh3! d6 14.Bxd3 0-0 15.fxe5 15.Bd2?? Nxd3 16.Rxe7 Ndf2+ 17.Nxf2 Nxf2+ 18.Kg1 Nxd1+-+ 15.Bc2 Nf2+ 16.Nxf2 Bxf2 17.Re4 17.Re2 Bg4 17...Bf5 15...Nxe5 16.Nf4 c6 17.Nd2 g5?! 18.Qh5 f5?? 18...f6 19.Bc4+! Kg7 19...d5 20.Nxd5 cxd5 21.Bxd5+ Kh8 22.Nf3 Bc7 23.Bxg5 Qg7 23...Qd6 24.Nxe5 Qxd5? 25.Ng6+ Kg8 25...Kg7 26.Qh6+ Kf7 27.Qxh7# 26.Ne7+ 23...Qd7 24.Nxe5 Bxe5 25.Rxe5 23...Qe8 24.Bf6+ Rxf6 25.Qxe8+ Kg7 26.Qg8+ Kh6 27.Qg5# 24.Nxe5 Bxe5 25.Bh6+- 19...Kh8 20.Rxe5 20.Nf3! h6 20...Qf6 21.Nxg5 h6 22.Nfe6+ Bxe6 23.Nxe6+ Kh7 23...Kg8 24.Rxe5 d5 25.Bxh6 24.Nxf8+ 20...Bd8 21.Nxg5 Qxg5 22.Ne6+ Bxe6 23.Bxg5+- 20...gxf4 21.Bxf4 Bc7 22.Nxe5 dxe5 23.Rxe5! Qf6 23...Bxe5 24.Qh6+ Kh8 25.Bxe5+ Qxe5 26.Qxf8# 24.Rae1+- 21.Nxe5 21.Rxe5!? dxe5 22.Qg6+ Kh8 23.Qxh6+ Qh7 24.Ng6# 21...Qf6 21...dxe5 22.Qg6+ Kh8 23.Qxh6+ Qh7 24.Ng6# 21...gxf4 22.Qg6+ Kh8 23.Qxh6+ Qh7 24.Ng6# 22.Ng4! fxg4 22...gxf4 23.Re7+ Kh8 23...Qxe7 24.Qxh6# 24.Nxf6 Rxf6 25.Qe8+ 23.Re7+! 23.Re7+ Kh8 24.Ng6+ Qxg6 25.Qxg6+- 1–0
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Anderssen,A | - | Mayet,C | - | 1–0 | 1851 | C52 | Berlin m1 | |
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At first, the next game was simply chosen as an example of top players of the 30s with top commentators, but a little research showed its significant sporting importance in its day. The Czech player Salo Flohr and American player Reuben Fine were both in their prime in 1935/36, a period in which the two players really peaked, scoring important wins around the world so that they were considered top contenders for a World Championship match. Flohr tied for first with Botvinnik in Moscow 1935, and won Margate 1936 ahead of Capablanca among other notable results, while Fine raked in wins at Zanvoort 1936, ahead of World Champion Euwe, Tartakower, and Keres, plus a tie for first with Euwe at Amsterdam 1936, ahead of Alekhine.
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Salo Flohr (1933) |
Reuben Fine |
During this mutual period of unbridled success, the two competed at the famous Hastings tournament of 1935/36 where they met in the very first round. Little did they know that this first round game would ultimately decide the final standings. Reuben Fine won a fine victory, and eventually came first, whereas this was to be Flohr’s only loss, who came in second. Had they tied, they would have shared first on points.
Final standings at Hastings 1935/36

The sources for the annotations are given after the first move and are mouthwatering to say the least:
- Fine: Lessons From My Games.p.54-56.
- Schach-Echo 1936, S.17.
- Euwe in Schach-Echo 1936,S.38.
- Eliskases in WSZ 1936,S.11.
- Kotov:Think Like a Grandmaster.1971. p.21.
Salo Flohr - Reuben Fine
(Annotations by Fine/SE/Euwe/Eliskases/Kotov)

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1.d4 e6 2.c4 Nf6 3.Nc3 d5 4.Bg5 Nbd7 5.e3 Be7 6.Nf3 0-0 7.Qc2 c6 7...c5 8.a3 Re8 9.Rd1 dxc4 10.Bxc4 Nd5 11.Bxe7 Qxe7 12.0-0 Nxc3 13.Qxc3 c5 14.d5 exd5 15.Rxd5 b6 16.Rfd1 Rf8 17.b4 cxb4 18.axb4 Nf6 19.Re5 Qc7 20.Ng5 Bb7 21.Ne6 Qc6 22.f3 Ba6 23.Rd4 Rfc8 24.Nd8? 24.Rg5 fxe6 24...Qxe6 25.Rd8+! Rxd8 26.Bxe6+- 25.Rdg4 Kh8 25...Rc7 26.Qxf6 Qd7 27.Rxg7+ Qxg7 28.Rxg7+ Rxg7 29.Qxe6+ Kh8 30.Bxa6+- 26.Rxg7 e5! 27.Qxe5 Re8 28.Rxh7+ Kxh7 29.Qf5+ Kh8 30.Rg6 Re7 31.Rh6+ Rh7 32.Rxf6 Qxc4 33.Rf8+ Rxf8 34.Qxf8+ Qg8 35.Qf6+ Rg7 36.Qh4+ Qh7 37.Qd8+ Rg8 38.Qf6+= 24.Rg4! Nxg4 24...Bxc4 25.Rxg7+ Kh8 26.Rh5 Qxe6 27.Rgxh7+! Kg8 28.Rh8+ Kg7 29.R5h7+ Kg6 30.Qc2+ Ne4 30...Kg5 31.Rg7# 31.Rh6+ Kg7 32.R8h7+ Kg8 33.Rxe6+- RR24...Kh8! 25.Rc5! 25.Rxg7 Qxc4-+ 25...bxc5 26.Rxg7 Bxc4 27.Rxf7 Qxe6 28.Rxf6 Kg8 29.Rxe6 Bxe6 30.Qf6 30.Qe5 25.Rg5 f6 26.Rxg7+ Kh8 27.Qd3 24.b5! Bxb5 25.Nxg7! Bxc4 25...Kxg7 26.Rxb5+- Qxb5 27.Rg4+ Kf8 28.Qxf6 Rxc4 29.Qd6+ 26.Nf5 RR26.Nh5 Nxh5 26...Bd5 27.Nxf6+ Qxf6 28.Rg4+ Qg6 29.Rxg6+ hxg6 30.Qa3+- 27.Rg5+ Kf8 27...Qg6 28.Rxg6+ hxg6 29.Rxc4+- 28.Qa3+ Qc5 29.Rxc5 Rxc5 30.Rxc4+- 26...Qa4 27.Re8+ 27.h3! h5 27...Kh8 28.Rd8+ Rxd8 29.Re8+ Qxe8 30.Qxf6+ 27...b5 28.Re8+ Rxe8 29.Rg4+ Kf8 30.Qxf6 Qd1+ 31.Kh2 28.Qe1 Kh8 29.Qh4+- 27...Rxe8 28.Rg4+ Kf8 29.Qxf6 RRQd1+ 30.Kf2 Qc2+ 31.Kg3 Qxf5! 32.Qxf5 Be6 33.Qxh7 Bxg4 RR24.Nxg7‼ Kxg7 24...Qxc4 25.Rxc4 Rxc4 26.Qa1 Rac8 27.Kf2 Rc2+ 28.Kg3 Bf1 29.Nf5 Rxg2+ 30.Kh4 Rxh2+ 31.Kg5 Rg2+ 32.Kxf6 Rg6+ 33.Ke7+- 24...Bxc4 25.Nf5 25.b5! 25.Rg5+± 25...Bxb5 26.Rxb5+- Kf8 27.Rf5 Qe6 28.e4 Rc7 29.Qa3+ Qe7 30.Qe3 Kg8 31.Qh6+- 24...Qc7 25.Rg4?? 25.Bxf7+ Qxf7 26.Qxc8! Rxc8 27.Nxf7 Kxf7 28.g4= 25.Nxf7 Bxc4-+ 25.b5 Qxe5 26.bxa6 26.Nxf7 Rxc4 27.Qxc4 Qxe3+ 28.Kf1 Bxb5 29.Nh6+ Kf8 30.Qxb5 Qxd4-+ 26...Qe7 27.Nb7 27.Nxf7 Rxc4 28.Qxc4 Qxf7 27...b5-+ 25.Rg5 Bxc4 26.Rxg7+ 26.Rdg4 Qxd8 27.Rxg7+ Kf8 26...Kxg7 27.Rg4+ Kf8 28.Qxf6 Rxd8-+ 25...Qxd8-+ 25...Rxd8! 26.Reg5 Qd1+ 27.Kf2 Nxg4+ 28.Rxg4 g6 29.Bxf7+ Kxf7 30.Rf4+ Kg8 31.Qf6 Qd7 0–1
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Flohr,S | - | Fine,R | - | 0–1 | 1935 | D61 | Christmas Congress 1935/36-16 Premier | 1 |
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The third and last game shown was one that took serious deliberation due to the numerous attractive candidates initially separated for possible inclusion. The first was Paul Morphy vs Duke of Brunswick/Count Isouar, a rightly famous game, but with the unique annotations by Bobby Fischer! His notes are typically irreverent ("It's funny, I played two [simultaneous] exhibitions here in Sarajevo, and both players played exactly the same. Maybe they were trying to lose the same way, as a joke or something."). Another was Mikhail Botvinnik - David Bronstein (1951 match, G9) with notes by both players. Great stuff.
In the end, the following game was chosen for both its sporting, historical and (unintentional) humorous content. It highlights the 5th World Champion Mikhail Botvinnik during his ascension in a game against Vladimir Alatortsev at the 1932 Leningrad Championship. The game of course is excellent in and of itself, but the rich notes from various sources are what give it that extra shine. Botvinnik's notes from works published in both 1936 and later in 1984 show fascinating insight on his evolution and hindsight gained. This alone would warrant the price of entry as the comments are clearly identified per date.

Mikhail Botvinnik (1936)
However, the reader is also given the extensive and unforgiving annotations from Siegbert Tarrasch from his magazine Schachzeitung (Chess Newspaper) in late 1933. Although at the end of the game he decries the lack of brilliance displayed by Botvinnik, who he recognizes as a budding genius, but fails to see yet as a World Champion, he also brings about his famously instructive comments, which made classics of his works, quoted even by Kasparov to this day.

Siegbert Tarrasch was one of the foremost players of his day, as well as instructors. His work Three Hundred Chess Games is considered one of the great classics.
Botvinnikk - Alatortsev (Leningrad, 1932)

Position after 10.exd4
Tongue in cheek, Tarrasch writes:
"It is incomprehensible that Botvinnik — and everyone else, since the position has already occurred innumerable times — accepts an isolated pawn here, something which one usually fears almost as much a knight fork on the king and queen! But, joking apart, the teaching about how harmful the isolated queen's pawn is is one of the numerous wrong-headed ideas which this chess magazine was founded in order to contest."
Mikhail Botvinnik - Vladimir Alatortsev
(Annotations by Botvinnik [1936 and 1984] and Tarrasch)

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1.Nf3 d5 2.d4 Nf6 3.c4 c6 4.e3 4.Nc3 dxc4 4...Bf5 5.cxd5 cxd5 6.Qb3 4...e6 4...Bf5 5.Bd3 dxc4 6.Bxc4 c5 7.0-0 Nc6 8.Qe2 8.Nc3 Be7 9.Qe2 cxd4 10.Rd1 e5 8...cxd4 9.Rd1 Be7 10.exd4 0-0 11.Nc3 Nb4 12.Ne5 Nbd5 12...Bd7 13.d5 exd5 14.Nxd5 Nbxd5 15.Bxd5 Nxd5 16.Rxd5 Bg4 17.Qc4 Qxd5! 18.Qxd5 Rad8 13.Bg5 13.Qf3 Qd6 13...h6 13...Nxc3 14.bxc3 Nd5 15.Bd2 14.Bh4 Bd7 14...Nxc3 15.bxc3 Nd5 16.Bxe7 Nxe7 16...Qxe7 17.Ng6 15.Nxd5 Nxd5 15...exd5 16.Bxf6 gxf6 17.Nxd7 Qxd7 18.Bd3 16.Bxe7 16.Bxd5 exd5 17.Nxd7 Re8‼ 18.Bxe7 Qxd7 19.Re1 Rac8! 20.Qf3 Rxe7 21.Rxe7 Qxe7 22.Qxd5 Rc2 23.Qb5 Qe4 16...Qxe7 16...Nxe7 17.d5 exd5 18.Bxd5 Nxd5 19.Rxd5 Bg4 20.Qc4 16...Nxe7 17.d5 exd5 18.Bxd5 Nxd5 19.Rxd5 Bg4 20.Qc4! 17.Ng6 fxg6 18.Bxd5 Rae8 19.Re1 19.Bxb7 Ba4 20.b3 Bxb3 19...Qb4 20.Bb3 Rf6 20...Qxd4 21.Rad1 20...Bc8 21.d5 e5 21...exd5 22.Qxe8 22.d6+ Kh7 23.Rad1 Bd7 21.Rad1 Ref8 22.f3 Kh7 23.Qd2 Qb6 24.Re5 Rf4 25.Qe3 25.Qa5 Rxd4! 25.Qc3 Rc8 25...R8f6 26.Qc3 Bc6 26...R4f5 27.Qc5 27.Rxe6 Rxe6 28.Bxe6 Bxf3 29.Qc8 h5! 30.Bg8+ Kh6 30...Kh8 31.Bd5+ Kh7 32.Bxf3 31.gxf3 Rxd4 32.Qc1+ 27.Bxe6 Bxf3 28.Qc8 Rf8 27...Qxc5 28.dxc5 R4f5 28...R6f5 29.Rde1 Rxe5 30.Rxe5 Rd4 31.Kf2 Rd2+ 32.Re2 Rxe2+ 33.Kxe2 29.Rde1 Rxe5 29...Bd5 30.Bxd5 exd5 31.Rxf5 Rxf5 31...gxf5 32.Rd1 32.Re7 d4 33.b4 30.Rxe5 Rf5 30...Bd7 31.Rxf5 exf5 32.Kf2 g5 32...f4 33.Bc2 33.Ke3 Kg6 34.Kd4 Kf6 35.Bd5 h5 36.h3 36.-- g4 37.f4? 37.b4 gxf3 38.gxf3 g5 37.fxg4 hxg4 37...g5 36...g4 37.hxg4 fxg4 38.fxg4 hxg4 39.g3 Kf5 40.b4 Kf6 41.Ke4 41.Bxc6 bxc6 42.b5 cxb5 42...Ke6 43.b6 axb6 44.cxb6 Kd6 45.Kc4 c5 46.Kb5 c4 47.Ka6 43.Kd5 41...Ke7 42.Bxc6 bxc6 43.Kf5 a6 44.a3 Kf7 45.Kxg4 Ke6 46.Kg5 1–0
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Botvinnik,M | - | Alatortsev,V | - | 1–0 | 1932 | D26 | Leningrad-ch09 | 4 |
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As you can see, these are hardly the most famous games, as it would have been extremely easy to find notes in such cases, yet all bring enormous value to the user willing to look around for a hidden diamond. Mega 2017 is more than just a huge database described by large numbers, it is a an enormous library of classics just waiting for the student.