a JavaScript PGN chess game parser and viewer

Paste a PGN chess game:

[Event "Amsterdam"][Site "?"][Date "1923.??.??"][Round "?"][White "Euwe, Max"][Black "Sonnenberg"][Result "1-0"][Annotator "JvR"][SetUp "1"][FEN "6k1/6pp/p1p1b3/1p1p4/1P6/2P4P/1P1N1PP1/6K1 w - - 0 35"][PlyCount "41"] {Lesson twelve. Crossing a diagonal.  The bishop has a special effect on the chess board. Connected squares on a diagonal become strong, while the adjacent squares stay weak.  The limitations of a bishop become painfully clear in the endgame of the weak bishop against the strong knight. Weak squares can be used by the opponent as an entrance to the hostile position. A difficulty arises when a strongly defended diagonal has to be crossed. An instructive endgame by Euwe clarifies this process.} 35. Nf3 Bd7 { Black has an awful pawn structure on the queenside.} 36. Ne5 Be8 37. f4 { The strong knight has chased away the weak bishop.} 37... Kf8 38. Kf2 Ke7 39. Ke3 Kd6 40. Kd4 {The white king has utilised weak squares for an advance. Black can hardly move. If he allows an exchange of pieces, the pawn ending will be lost. He tries to create a defence line on the kingside instead.} 40... g6 41. Nd3 Bd7 42. Nc5 {White blockades on two squares.} 42... Bc8 {White seems to have allowed a defence of the diagonal c8-h3, but Euwe crushes the opposition. He crosses the Rubicon!} 43. g4 $1 h5 (43... h6 44. b3 $1 { and Black has to play} 44... h5 {anyway.}) 44. f5 $1 gxf5 45. gxh5 f4 46. Nd3 Bxh3 ({The alternative} 46... f3 47. Ke3 Bf5 48. Nc5 a5 49. Nb7+ { also offers little resistance.}) 47. Nxf4 Bf5 48. Nd3 Bh7 49. Nc5 {An immediate advance is fine, but Euwe decides to gain a pawn. It increases the humiliation. } 49... Bf5 50. Nxa6 Bh7 51. Nc5 Bf5 52. Nd3 Ke6 53. Ne5 Kd6 54. h6 { The advance occurs.} 54... Be4 55. Nf7+ 1-0

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