Try below schema: json schema validator

I'm using property type for validation for if condition I'm setting type as string with maxLength is zero and for else I'm setting type as number with minimum and maximum properties, You can updated these based on your requirement

{
    "$schema": "http://json-schema.org/draft-07/schema",
    "type": "object",
    "required": [
        "courses"
    ],
    "properties": {
        "courses": {
            "type": "array",
            "items": {
                "type": "object",
                "required": [
                    "position",
                    "previous_course_rank",
                    "location",
                    "established",
                    "course_name",
                    "course_id",
                    "holes"
                ],
                "properties": {
                    "position": {
                        "type": "string"
                    },
                    "previous_course_rank": {
                        "type": "string"
                    },
                    "location": {
                        "type": "string"
                    },
                    "course_name": {
                        "type": "string"
                    },
                    "course_id": {
                        "type": "string"
                    },
                    "holes": {
                        "type": "array",
                        "items": {
                            "type": "object",
                            "required": [
                                "hole"
                            ],
                            "properties": {
                                "hole": {
                                    "type": "string"
                                }
                            }
                        }
                    }
                },
                "if": {
                    "properties": {
                        "course_id": {
                            "const": "056"
                        }
                    }
                },
                "then": {
                    "properties": {
                        "established": {
                            "type": "string",
                            "maxLength": 0
                        }
                    }
                },
                "else": {
                    "properties": {
                        "established": {
                            "type": "number",
                            "minimum": 1900,
                            "maximum": 3000
                        }
                    }
                }
            }
        }
    }
}