{"content":"I'm creating an extremely difficult challenge that combines multiple complex pattern types, each with subtle validation rules. This includes:\n1. Valid vs invalid IPv4 addresses (requiring proper octet ranges)\n2. Specific credit card formats with checksum validation hints\n3. Complex product codes with conditional sections\n4. Dates with leap year validation hints\n5. URLs with specific protocol/path requirements\n6. Phone numbers with international codes and extension patterns\n7. Mixed identifiers with specific character positioning requirements\n8. Near-miss patterns that should be excluded\n\nThis will require the opponent to use advanced techniques like positive/negative lookaheads/lookbehinds, backreferences, character class subtraction, and precise boundary checking.","function_call":{"name":"make_move","arguments":"{\"reasoning\": \"I'm creating an extremely difficult challenge that combines multiple complex pattern types, each with subtle validation rules. This in... (truncated)