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Las mejores bases de datos y visores de juegos de Ajedrez en PGN

Para poder visualizar un juego de ajedrez en PGN he echo un ejemplo con la celebre partida entre los Maestros Anderssen y Kierseritzky, en La Partida Inmortal.
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El PGN en texto esta comentado en ingles y para verlo en el visor de partidas basta con seguir este enlace.
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Este sitio se llama chessmicrobase.com y permite almacenar unas 300 partidas propias.
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Como restriccion he notado que no sirve para variantes como el ajedrez960
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[Event "London"]
[Site "?"]
[Round "0"]
[White "Anderssen"]
[Black "Kieseritzky"]
[Result "1-0"]
[ECO "C33"]
[Opening "KGA: Bishop's Gambit"]
1. e4 {Known as the "Immortal Game" this magnificent example of Adolf
Anderssen's combinative powers is still considered one of the best games of
all time.} 1... e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 b5 {The Bryan Counter-Gam bit
where Black wishes to draw the bishop away from the a2-g8 diagonal.} 5. Bxb5
Nf6 6. Nf3 Qh6 { The Black queen proves to be out of play here. Better was
6...Qh5.} 7. d3 Nh5 { 7...g5 was a more natural way to defend the f-pawn.} 8.
Nh4 {8.Kg1 would stop Black's threat of Ng3+ winning the exchange. However,
White would now drop a piece instead.} 8... Qg5 9. Nf5 c6 { 9...g6 10.h4 Qf6
11.Nc3 gxf5 12.Qxh5 would give White the lead in development.} 10. g4 Nf6 11.
Rg1 {This piece sacrifice pursues White's agressive policy started with 8.Nh4.
The important d5-square will now become available.} 11... cxb5 12. h4 Qg6 {The
queen is a useless bystander now.} 13. h5 Qg5 14. Qf3 { Threatens to trap the
Black queen with 15.Bxf4.} 14... Ng8 { So Black is forced to retreat to the
home square.} 15. Bxf4 Qf6 16. Nc3 { Although White has only two pawns for a
piece he has a winning position due to his large lead in development. Black's
pieces, with the exception of the queen and the b-pawn, are all on their
original squares.} 16... Bc5 17. Nd5 { This introduces a double rook
sacrifice, where White will give up both of his rooks, even though he is
already a piece down.} 17... Qxb2 18. Bd6 { Thus begins the "Immortal
Sacrifice".} 18... Qxa1+ { 18...Bxd6 19.Nxd6+ Kd8 20.Nxf7+ Ke8 when White
would have a forced mate in two. } 19. Ke2 Bxg1 {The best defense, as noted by
Steinitz, was 19...Qb2, but fortunately for posterity Kieseritzky didn't
figure that out. 19...Qxg1 would again allow White a forced mate.} 20. e5 {By
blocking the queen off the protection of his g-pawn. White is threatening to
mate in two with 21.Nxg7+ Kd8 22.Bc7 mate.} 20... Na6 {Black covers the c7
square from White's dark squared bishop. However, just when you think Black
might defend, Anderssen explodes the position with yet another brilliant
line.} 21. Nxg7+ Kd8 22. Qf6+ {By sacrificing the queen White has mate next
move.} 22... Nxf6 {The only move. } 23. Be7# {A forced mate by three minor
pieces while Black still has most of his pieces on the board. Truly a
magnificent game...The Immortal Game.} 1-0
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Tambien permite compartir el visor para blogs y foros aunque el modo embebido suele fallar en blogger dynamic views o cuando el sitio de chessmicrobase esta caido, pero funciona bien en otras plataformas, cuestion de ensayar.

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