{
  "pack_format_version": 3,
  "slug": "larsens-opening-essentials-black",
  "title": "Larsen's Opening: Essentials (Black Repertoire)",
  "author_name": "Theo van Stratum",
  "version": 1,
  "description": "A Black repertoire for meeting Larsen's Opening (1.b3, the Nimzo-Larsen Attack), organised by White's approach. Includes meeting the Ruy-Lopez-style pin with 1...e5, meeting the quiet fianchetto treatment with 1...d5 and 1...Nf6, and meeting the double-fianchetto treatment with 1...c5.",
  "content_types": [
    "lines"
  ],
  "price_cents": null,
  "lines": [
    {
      "name": "Larsen's Opening: vs 1...e5",
      "side": "black",
      "eco": "A01",
      "moves": [
        "b2b3",
        "e7e5",
        "c1b2",
        "b8c6",
        "e2e3",
        "g8f6",
        "f1b5",
        "f8d6",
        "g1f3",
        "d8e7",
        "e1g1",
        "e8g8",
        "d2d4",
        "e5e4",
        "f3d2",
        "f8e8",
        "d1e1",
        "a7a6",
        "b5a4",
        "h7h6"
      ],
      "annotations": {
        "1": {
          "note": "A direct central reply, grabbing space and daring White's fianchettoed bishop to do something about it.",
          "format": "markdown"
        },
        "3": {
          "note": "Defending the e5 pawn and developing naturally.",
          "format": "markdown"
        },
        "5": {
          "note": "Developing the king's knight.",
          "format": "markdown"
        },
        "7": {
          "note": "A natural developing square for the bishop, keeping an eye on the kingside.",
          "format": "markdown"
        },
        "9": {
          "note": "Developing the queen, preparing to castle.",
          "format": "markdown"
        },
        "11": {
          "note": "Castling into safety.",
          "format": "markdown"
        },
        "13": {
          "note": "Claiming further central space and gaining a tempo on White's knight.",
          "format": "markdown"
        },
        "15": {
          "note": "A useful rook lift, adding support to the e-file now that it has partly opened.",
          "format": "markdown"
        },
        "17": {
          "note": "Challenging White's bishop, forcing a decision about the pin.",
          "format": "markdown"
        },
        "19": {
          "note": "A useful waiting move, taking the g5 square away from White's pieces.",
          "format": "markdown"
        }
      },
      "variations": [
        {
          "branch_ply": 8,
          "moves": [
            "d1e2",
            "e8g8",
            "g1f3",
            "f8e8",
            "d2d3"
          ],
          "annotations": {
            "1": {
              "note": "Castling into safety regardless of White's exact move order.",
              "format": "markdown"
            },
            "3": {
              "note": "A useful rook lift, just as in the main line.",
              "format": "markdown"
            }
          }
        }
      ]
    },
    {
      "name": "Larsen's Opening: vs 1...d5",
      "side": "black",
      "eco": "A01",
      "moves": [
        "b2b3",
        "d7d5",
        "c1b2",
        "b8c6",
        "e2e3",
        "g8f6",
        "g1f3",
        "c8f5",
        "f1e2",
        "e7e6",
        "e1g1",
        "f8d6",
        "d2d3",
        "e8g8",
        "b1d2",
        "d8e7",
        "c2c4",
        "a8d8",
        "d1c2",
        "d5c4"
      ],
      "annotations": {
        "1": {
          "note": "A solid central pawn, challenging White's flank set-up directly.",
          "format": "markdown"
        },
        "3": {
          "note": "Developing naturally.",
          "format": "markdown"
        },
        "5": {
          "note": "Developing the king's knight.",
          "format": "markdown"
        },
        "7": {
          "note": "Developing the bishop outside the pawn chain before playing ...e6, avoiding shutting it in behind the pawns.",
          "format": "markdown"
        },
        "9": {
          "note": "Completing the pawn chain.",
          "format": "markdown"
        },
        "11": {
          "note": "Repositioning the bishop toward the kingside, keeping it active rather than leaving it blocked in.",
          "format": "markdown"
        },
        "13": {
          "note": "Castling into safety.",
          "format": "markdown"
        },
        "15": {
          "note": "Developing the queen, preparing to bring the rooks into play.",
          "format": "markdown"
        },
        "17": {
          "note": "Centralising the rooks and preparing to meet White's central play.",
          "format": "markdown"
        },
        "19": {
          "note": "Taking the pawn now that White has committed to challenging the centre, keeping material level.",
          "format": "markdown"
        }
      },
      "variations": [
        {
          "branch_ply": 8,
          "moves": [
            "c2c4",
            "e7e6",
            "f1e2",
            "f8d6",
            "e1g1"
          ],
          "annotations": {
            "1": {
              "note": "Completing the pawn chain regardless of White's exact move order.",
              "format": "markdown"
            },
            "3": {
              "note": "Repositioning the bishop toward the kingside, just as in the main line.",
              "format": "markdown"
            }
          }
        }
      ]
    },
    {
      "name": "Larsen's Opening: vs 1...Nf6",
      "side": "black",
      "eco": "A01",
      "moves": [
        "b2b3",
        "g8f6",
        "c1b2",
        "g7g6",
        "e2e3",
        "f8g7",
        "g1f3",
        "e8g8",
        "f1e2",
        "d7d6",
        "e1g1",
        "b8c6",
        "d2d4",
        "e7e5",
        "d4d5",
        "c6e7",
        "b1d2",
        "f8e8",
        "c2c4",
        "e7f5"
      ],
      "annotations": {
        "1": {
          "note": "Developing naturally and keeping the central structure flexible.",
          "format": "markdown"
        },
        "3": {
          "note": "Heading for a King's Indian-style set-up with a kingside fianchetto.",
          "format": "markdown"
        },
        "5": {
          "note": "Completing the fianchetto.",
          "format": "markdown"
        },
        "7": {
          "note": "Castling into safety.",
          "format": "markdown"
        },
        "9": {
          "note": "A flexible central pawn move, preparing to develop the rest of the pieces.",
          "format": "markdown"
        },
        "11": {
          "note": "Developing the queen's knight.",
          "format": "markdown"
        },
        "13": {
          "note": "Claiming central space now that development is well under way.",
          "format": "markdown"
        },
        "15": {
          "note": "Retreating the knight rather than losing it to White's advancing d-pawn.",
          "format": "markdown"
        },
        "17": {
          "note": "A useful rook lift, adding support to the e-file.",
          "format": "markdown"
        },
        "19": {
          "note": "Improving the knight's position, eyeing d4 and e3 as useful outposts.",
          "format": "markdown"
        }
      },
      "variations": [
        {
          "branch_ply": 8,
          "moves": [
            "c2c4",
            "d7d6",
            "f1e2",
            "b8d7",
            "e1g1"
          ],
          "annotations": {
            "1": {
              "note": "A flexible central pawn move regardless of White's exact move order.",
              "format": "markdown"
            },
            "3": {
              "note": "Developing the queen's knight toward the centre, keeping options open about where the rest of the pieces will go.",
              "format": "markdown"
            }
          }
        }
      ]
    },
    {
      "name": "Larsen's Opening: vs 1...c5",
      "side": "black",
      "eco": "A01",
      "moves": [
        "b2b3",
        "c7c5",
        "c1b2",
        "b8c6",
        "e2e3",
        "g8f6",
        "g1f3",
        "e7e6",
        "f1e2",
        "f8e7",
        "e1g1",
        "e8g8",
        "d2d3",
        "b7b6",
        "b1d2",
        "c8b7",
        "c2c4",
        "d8c7",
        "d1c2",
        "a8d8"
      ],
      "annotations": {
        "1": {
          "note": "A direct reply on the flank, mirroring White's own set-up with colours reversed.",
          "format": "markdown"
        },
        "3": {
          "note": "Developing naturally.",
          "format": "markdown"
        },
        "5": {
          "note": "Developing the king's knight.",
          "format": "markdown"
        },
        "7": {
          "note": "A flexible central pawn move, preparing to develop the king's bishop.",
          "format": "markdown"
        },
        "9": {
          "note": "Simple development, preparing to castle.",
          "format": "markdown"
        },
        "11": {
          "note": "Castling into safety.",
          "format": "markdown"
        },
        "13": {
          "note": "Preparing to fianchetto the queen's bishop, matching White's own set-up.",
          "format": "markdown"
        },
        "15": {
          "note": "Completing the fianchetto, contesting the same long diagonal that White's own bishop is eyeing.",
          "format": "markdown"
        },
        "17": {
          "note": "Developing the queen, keeping it safely tucked behind the fianchetto.",
          "format": "markdown"
        },
        "19": {
          "note": "Centralising the rooks and preparing to meet whichever plan White settles on.",
          "format": "markdown"
        }
      },
      "variations": [
        {
          "branch_ply": 8,
          "moves": [
            "c2c4",
            "d7d5",
            "c4d5",
            "f6d5",
            "f1e2"
          ],
          "annotations": {
            "1": {
              "note": "Challenging the centre immediately rather than fianchettoing first.",
              "format": "markdown"
            },
            "3": {
              "note": "Recapturing toward the centre, keeping the position simple and well-developed.",
              "format": "markdown"
            }
          }
        }
      ]
    }
  ],
  "woodpecker_sets": [],
  "endgame_positions": []
}