{
  "pack_format_version": 3,
  "slug": "nimzo-indian-essentials-black",
  "title": "The Nimzo-Indian Defence: Essentials (Black Repertoire)",
  "author_name": "Theo van Stratum",
  "version": 1,
  "description": "A Black repertoire built around the Nimzo-Indian Defence (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4). Includes meeting the classical Rubinstein Variation (4.e3), the Samisch Variation (4.a3) with its thematic bishop pair versus doubled pawns, the Classical Variation (4.Qc2) that sidesteps the doubled pawns altogether, and the sharper Leningrad Variation (4.Bg5).",
  "content_types": [
    "lines"
  ],
  "price_cents": null,
  "lines": [
    {
      "name": "Nimzo-Indian Defence: Black's Rubinstein",
      "side": "black",
      "eco": "E41",
      "moves": [
        "d2d4",
        "g8f6",
        "c2c4",
        "e7e6",
        "b1c3",
        "f8b4",
        "e2e3",
        "e8g8",
        "f1d3",
        "d7d5",
        "g1f3",
        "c7c5",
        "e1g1",
        "b8c6",
        "a2a3",
        "b4c3",
        "b2c3",
        "b7b6",
        "d1e2",
        "d8c7"
      ],
      "annotations": {
        "5": {
          "note": "Pinning the knight immediately rather than developing quietly with ...d5 or ...b6 first -- the hallmark of the Nimzo-Indian.",
          "format": "markdown"
        },
        "7": {
          "note": "Castling before committing the centre, keeping ...d5 and ...c5 both available.",
          "format": "markdown"
        },
        "9": {
          "note": "Staking a claim in the centre now that development allows it.",
          "format": "markdown"
        },
        "11": {
          "note": "Striking at the centre a second time, aiming to undermine White's d4-pawn rather than just blockading it.",
          "format": "markdown"
        },
        "15": {
          "note": "Trading the bishop for the knight now that White has forced the issue with a3 -- there's no good square to retreat to that keeps the bishop useful.",
          "format": "markdown"
        },
        "17": {
          "note": "Immediately shoring up the pawn on c5, which lost its only defender the moment the bishop left b4.",
          "format": "markdown"
        },
        "19": {
          "note": "Repositioning the queen off the back rank, now that c5 is safely covered.",
          "format": "markdown"
        }
      },
      "variations": [
        {
          "branch_ply": 7,
          "moves": [
            "b7b6",
            "g1f3",
            "c8b7",
            "f1e2",
            "d7d5"
          ],
          "annotations": {
            "0": {
              "note": "A flexible fianchetto approach instead of grabbing the centre with ...d5 right away -- this waits to see how White commits the light-squared bishop first.",
              "format": "markdown"
            },
            "2": {
              "note": "Completing the fianchetto and eyeing e4 along the long diagonal.",
              "format": "markdown"
            },
            "4": {
              "note": "Only now challenging the centre, once development is complete.",
              "format": "markdown"
            }
          }
        }
      ]
    },
    {
      "name": "Nimzo-Indian Defence: Black Meets the Samisch",
      "side": "black",
      "eco": "E25",
      "moves": [
        "d2d4",
        "g8f6",
        "c2c4",
        "e7e6",
        "b1c3",
        "f8b4",
        "a2a3",
        "b4c3",
        "b2c3",
        "b7b6",
        "e2e3",
        "c7c5",
        "f1d3",
        "c8b7",
        "g1f3",
        "e8g8",
        "e1g1",
        "b8c6",
        "d1e2",
        "f8e8"
      ],
      "annotations": {
        "5": {
          "note": "Pinning the knight immediately, same idea as always in the Nimzo.",
          "format": "markdown"
        },
        "7": {
          "note": "Trading right away rather than waiting -- a3 has already made the point moot, so there's no reason to retreat and lose more time.",
          "format": "markdown"
        },
        "9": {
          "note": "Immediately preparing ...Bb7, and just as importantly, defending the c5-pawn in advance before it's even played -- there's no square left to defend it from once the bishop is gone.",
          "format": "markdown"
        },
        "13": {
          "note": "Completing the fianchetto, eyeing e4 and the long diagonal.",
          "format": "markdown"
        },
        "17": {
          "note": "Completing development and adding more pressure to d4.",
          "format": "markdown"
        },
        "19": {
          "note": "A flexible rook move, keeping options open on the e-file.",
          "format": "markdown"
        }
      },
      "variations": [
        {
          "branch_ply": 7,
          "moves": [
            "b4e7",
            "g1f3",
            "e8g8",
            "e2e3",
            "d7d5"
          ],
          "annotations": {
            "0": {
              "note": "Declining the trade altogether and keeping the bishop pair, at the cost of a tempo -- a reasonable alternative now that a3 has committed White to playing on the queenside anyway.",
              "format": "markdown"
            },
            "2": {
              "note": "Castling into safety.",
              "format": "markdown"
            },
            "4": {
              "note": "Challenging the centre now that both sides have castled.",
              "format": "markdown"
            }
          }
        }
      ]
    },
    {
      "name": "Nimzo-Indian Defence: Black vs the Classical (4.Qc2)",
      "side": "black",
      "eco": "E32",
      "moves": [
        "d2d4",
        "g8f6",
        "c2c4",
        "e7e6",
        "b1c3",
        "f8b4",
        "d1c2",
        "e8g8",
        "a2a3",
        "b4c3",
        "c2c3",
        "b7b6",
        "b2b4",
        "c8b7",
        "c1b2",
        "d7d6",
        "g1f3",
        "b8d7",
        "e2e3",
        "c7c5"
      ],
      "annotations": {
        "5": {
          "note": "The usual pin, though here it's met with 4.Qc2 rather than 4.e3 -- White is preparing to recapture on c3 with the queen instead of a pawn, avoiding the doubled pawns altogether.",
          "format": "markdown"
        },
        "7": {
          "note": "Castling before deciding how to handle the pin.",
          "format": "markdown"
        },
        "9": {
          "note": "Trading anyway, even knowing White recaptures cleanly with the queen -- the point is to gain the bishop pair and a tempo, not to damage White's structure.",
          "format": "markdown"
        },
        "11": {
          "note": "Preparing the fianchetto and aiming straight back down the long diagonal the queen just vacated on c3.",
          "format": "markdown"
        },
        "13": {
          "note": "Completing the fianchetto, directly opposing White's own bishop once it gets to b2.",
          "format": "markdown"
        },
        "17": {
          "note": "Completing development and preparing ...e5 or ...c5 to challenge the centre.",
          "format": "markdown"
        },
        "19": {
          "note": "Finally striking at the centre, now that development is complete.",
          "format": "markdown"
        }
      },
      "variations": [
        {
          "branch_ply": 9,
          "moves": [
            "b4e7",
            "g1f3",
            "d7d5",
            "c4d5",
            "f6d5"
          ],
          "annotations": {
            "0": {
              "note": "Retreating instead of trading -- since the queen recapture on c3 costs White nothing structurally, there's less reason to volunteer the trade, and keeping the bishop pair has its own value.",
              "format": "markdown"
            },
            "2": {
              "note": "Challenging the centre directly.",
              "format": "markdown"
            },
            "4": {
              "note": "Recapturing toward an active, central square.",
              "format": "markdown"
            }
          }
        }
      ]
    },
    {
      "name": "Nimzo-Indian Defence: Black Meets the Leningrad",
      "side": "black",
      "eco": "E30",
      "moves": [
        "d2d4",
        "g8f6",
        "c2c4",
        "e7e6",
        "b1c3",
        "f8b4",
        "c1g5",
        "h7h6",
        "g5h4",
        "c7c5",
        "e2e3",
        "d7d6",
        "g1f3",
        "b8d7",
        "f1e2",
        "b7b6",
        "e1g1",
        "c8b7",
        "a1c1",
        "e8g8"
      ],
      "annotations": {
        "5": {
          "note": "The same pin as ever, though here White answers with the sharper 4.Bg5 rather than a quieter set-up.",
          "format": "markdown"
        },
        "7": {
          "note": "Asking the bishop the question immediately -- it has to either retreat or trade itself for the knight on f6.",
          "format": "markdown"
        },
        "9": {
          "note": "Striking at the centre while the bishop is still deciding where it belongs.",
          "format": "markdown"
        },
        "11": {
          "note": "A solid, flexible follow-up, keeping the structure intact rather than committing to an immediate central confrontation with ...cxd4.",
          "format": "markdown"
        },
        "13": {
          "note": "Developing naturally and preparing ...e5 or ...b6 next.",
          "format": "markdown"
        },
        "15": {
          "note": "Preparing the fianchetto.",
          "format": "markdown"
        },
        "19": {
          "note": "Castling into safety. The bishop on b4 is left slightly loose, but it isn't achieving much there either, now that White's king has already moved off e1.",
          "format": "markdown"
        }
      },
      "variations": [
        {
          "branch_ply": 11,
          "moves": [
            "c5d4",
            "e3d4",
            "d7d5",
            "c4d5",
            "d8d5"
          ],
          "annotations": {
            "0": {
              "note": "Challenging the centre immediately instead of the calmer ...d6 -- this opens the position up rather than keeping it closed.",
              "format": "markdown"
            },
            "2": {
              "note": "Striking a second time in the centre.",
              "format": "markdown"
            },
            "4": {
              "note": "Recapturing with the queen, landing it actively in the centre.",
              "format": "markdown"
            }
          }
        }
      ]
    }
  ],
  "woodpecker_sets": [],
  "endgame_positions": []
}