{"content":"I'm creating an extremely difficult challenge that combines multiple complex pattern types with tricky edge cases. This challenge includes:\n1. Various IPv6 address formats (compressed and uncompressed) alongside similar-looking but invalid addresses\n2. Credit card numbers with different formatting and validation requirements\n3. Complex product codes with strict patterns\n4. ISBN numbers in different formats\n5. Base64 encoded strings with padding variations\n6. URLs with complex query parameters and fragments\n7. JSON-like snippets with nested quotes and escaping\n8. HTML-like tags with attributes\n\nThe valid patterns often have nearly-identical invalid counterparts that differ in subtle ways, making simple pattern matching insufficient. Proper validation would require lookaheads, character class negations, and precise quantification.","function_call":{"name":"make_move","arguments":"{\"reasoning\": \"I'm creating an extremely difficult challenge that combines multiple ... (truncated)