{
  "evaluation_id": "EVAL-20260317-020940",
  "question_id": "EVAL-20260317-020940",
  "question_text": "This Go code processes orders concurrently but occasionally produces incorrect totals. Find and fix all concurrency issues.\n\n```go\npackage main\n\nimport (\n    \"fmt\"\n    \"sync\"\n)\n\ntype OrderProcessor struct {\n    totalRevenue float64\n    orderCount   int\n    errors       []string\n}\n\nfunc (op *OrderProcessor) ProcessOrder(amount float64, wg *sync.WaitGroup) {\n    defer wg.Done()\n\n    if amount <= 0 {\n        op.errors = append(op.errors, fmt.Sprintf(\"invalid amount: %.2f\", amount))\n        return\n    }\n\n    op.totalRevenue += amount\n    op.orderCount++\n}\n\nfunc main() {\n    op := &OrderProcessor{}\n    var wg sync.WaitGroup\n\n    orders := []float64{99.99, 149.50, -10.00, 299.99, 49.99, 0, 199.99}\n\n    for _, amount := range orders {\n        wg.Add(1)\n        go op.ProcessOrder(amount, &wg)\n    }\n\n    wg.Wait()\n    fmt.Printf(\"Total: $%.2f from %d orders\\n\", op.totalRevenue, op.orderCount)\n}\n```",
  "category": "code",
  "timestamp": "2026-03-17T02:09:40.288Z",
  "display_date": "Mar 17, 2026",
  "winner": {
    "name": "Qwen 3.5 122B-A10B",
    "provider": "openrouter",
    "score": 9.77
  },
  "avg_score": 9.46625,
  "matrix_size": 53,
  "models_used": [
    {
      "id": "qwen3_8b",
      "name": "Qwen 3 8B",
      "provider": "openrouter"
    },
    {
      "id": "qwen3_32b",
      "name": "Qwen 3 32B",
      "provider": "openrouter"
    },
    {
      "id": "qwen3_coder_next",
      "name": "Qwen 3 Coder Next",
      "provider": "openrouter"
    },
    {
      "id": "qwen35_35b_a3b",
      "name": "Qwen 3.5 35B-A3B",
      "provider": "openrouter"
    },
    {
      "id": "qwen35_27b",
      "name": "Qwen 3.5 27B",
      "provider": "openrouter"
    },
    {
      "id": "qwen35_122b_a10b",
      "name": "Qwen 3.5 122B-A10B",
      "provider": "openrouter"
    },
    {
      "id": "qwen35_397b_a17b",
      "name": "Qwen 3.5 397B-A17B",
      "provider": "openrouter"
    },
    {
      "id": "qwen35_9b",
      "name": "Qwen 3.5 9B",
      "provider": "openrouter"
    }
  ],
  "rankings": {
    "qwen35_122b_a10b": {
      "display_name": "Qwen 3.5 122B-A10B",
      "provider": "openrouter",
      "average_score": 9.77,
      "score_count": 6,
      "min_score": 9,
      "max_score": 10,
      "rank": 1
    },
    "qwen35_35b_a3b": {
      "display_name": "Qwen 3.5 35B-A3B",
      "provider": "openrouter",
      "average_score": 9.71,
      "score_count": 7,
      "min_score": 9.2,
      "max_score": 10,
      "rank": 2
    },
    "qwen35_397b_a17b": {
      "display_name": "Qwen 3.5 397B-A17B",
      "provider": "openrouter",
      "average_score": 9.51,
      "score_count": 7,
      "min_score": 9,
      "max_score": 9.8,
      "rank": 3
    },
    "qwen3_32b": {
      "display_name": "Qwen 3 32B",
      "provider": "openrouter",
      "average_score": 9.51,
      "score_count": 7,
      "min_score": 8.3,
      "max_score": 10,
      "rank": 4
    },
    "qwen35_27b": {
      "display_name": "Qwen 3.5 27B",
      "provider": "openrouter",
      "average_score": 9.48,
      "score_count": 6,
      "min_score": 8.75,
      "max_score": 10,
      "rank": 5
    },
    "qwen3_8b": {
      "display_name": "Qwen 3 8B",
      "provider": "openrouter",
      "average_score": 9.45,
      "score_count": 6,
      "min_score": 8.4,
      "max_score": 10,
      "rank": 6
    },
    "qwen35_9b": {
      "display_name": "Qwen 3.5 9B",
      "provider": "openrouter",
      "average_score": 9.21,
      "score_count": 7,
      "min_score": 8.35,
      "max_score": 10,
      "rank": 7
    },
    "qwen3_coder_next": {
      "display_name": "Qwen 3 Coder Next",
      "provider": "openrouter",
      "average_score": 9.09,
      "score_count": 7,
      "min_score": 7.55,
      "max_score": 10,
      "rank": 8
    }
  },
  "judgments": [
    {
      "judge_key": "qwen35_9b",
      "judge_name": "Qwen 3.5 9B",
      "respondent_key": "qwen3_8b",
      "respondent_name": "Qwen 3 8B",
      "weighted_score": 8.4,
      "brief_justification": "The response correctly identifies data races and provides a working mutex-based solution. It could mention atomic operations as an alternative for simple counters and note that slice append is generally safe in Go."
    },
    {
      "judge_key": "qwen35_9b",
      "judge_name": "Qwen 3.5 9B",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 8.3,
      "brief_justification": "The response correctly identifies all concurrency issues and provides a working mutex-based solution, but contains factual errors in the sample output (claims 4 valid orders when there are 5, and calculates wrong total of $798.47 instead of $799.46). The explanation of alternatives and mutex usage is thorough and well-structured."
    },
    {
      "judge_key": "qwen35_9b",
      "judge_name": "Qwen 3.5 9B",
      "respondent_key": "qwen3_coder_next",
      "respondent_name": "Qwen 3 Coder Next",
      "weighted_score": 8.55,
      "brief_justification": "Response correctly identifies all race conditions and provides working mutex solution. Minor deduction for Solution 2's unsafe.Pointer usage which is not idiomatic Go and could cause undefined behavior."
    },
    {
      "judge_key": "qwen35_9b",
      "judge_name": "Qwen 3.5 9B",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 9.6,
      "brief_justification": "The response accurately identifies all race conditions (totalRevenue, orderCount, errors slice), provides a correct mutex-based fix, and offers valuable optimization suggestions. The explanation is thorough and the corrected code is production-ready."
    },
    {
      "judge_key": "qwen35_9b",
      "judge_name": "Qwen 3.5 9B",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 8.8,
      "brief_justification": "Response correctly identifies all concurrency issues and provides a working fix with mutex protection. Minor deduction for the atomic operations alternative not being fully integrated into a complete example."
    },
    {
      "judge_key": "qwen35_9b",
      "judge_name": "Qwen 3.5 9B",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 9,
      "brief_justification": "Response correctly identifies all race conditions and provides working fixed code with clear explanations. Minor deduction for not mentioning performance implications of holding mutex for entire operation or alternative approaches like atomic operations."
    },
    {
      "judge_key": "qwen35_9b",
      "judge_name": "Qwen 3.5 9B",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9,
      "brief_justification": "Response correctly identifies all three race conditions and provides accurate fixes with mutex synchronization. Well-structured with clear explanations, verification steps, and alternative approaches. Minor room for improvement on discussing atomic operations more thoroughly."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 10,
      "brief_justification": "The response thoroughly identifies all concurrency issues, provides correct fixes with mutex protection, explains alternative optimizations, and includes practical code examples with clear justification."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 10,
      "brief_justification": "The response correctly identifies all concurrency issues, provides a complete thread-safe solution with mutex, and explains the reasoning with depth. The code fix is practical and directly addresses the problem."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen3_coder_next",
      "respondent_name": "Qwen 3 Coder Next",
      "weighted_score": 9.8,
      "brief_justification": "The response accurately identifies race conditions and provides multiple valid solutions with detailed explanations. It covers all shared variables and explains tradeoffs between mutex and atomic approaches."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 10,
      "brief_justification": "The response accurately identifies all concurrency issues, provides a correct mutex-based solution, explains key fixes, and includes optional optimizations. The answer is thorough, clear, and directly addresses the problem with actionable code."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 10,
      "brief_justification": "The response thoroughly identifies all concurrency issues, provides correct fixes with mutex protection, explains alternatives, and includes verification methods. The solution is comprehensive, accurate, and actionable."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 10,
      "brief_justification": "The response thoroughly identifies and fixes all concurrency issues with proper mutex usage, explains the problems clearly, and provides practical best practices with actionable insights."
    },
    {
      "judge_key": "qwen3_8b",
      "judge_name": "Qwen 3 8B",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9.8,
      "brief_justification": "The response correctly identifies and fixes all concurrency issues with mutexes, provides clear explanations, and offers alternative approaches while maintaining code correctness and practicality."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 9.8,
      "brief_justification": "The response correctly identifies all concurrency issues and provides a complete, well-structured solution using a mutex. It also offers an optimized alternative with atomic operations and explains the reasoning clearly."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen3_8b",
      "respondent_name": "Qwen 3 8B",
      "weighted_score": 9.8,
      "brief_justification": "The response accurately identifies the concurrency issues and provides a complete, well-structured solution using a mutex. It explains the problem clearly, justifies the changes, and includes an updated code example that fixes all race conditions."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen3_coder_next",
      "respondent_name": "Qwen 3 Coder Next",
      "weighted_score": 10,
      "brief_justification": "The response accurately identifies all concurrency issues and provides multiple well-explained, working fixes. It covers race conditions on shared fields, properly introduces synchronization mechanisms (mutex and atomic), and addresses floating-point precision with integer arithmetic in cents."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 9.2,
      "brief_justification": "The response correctly identifies all concurrency issues in the Go code and provides a working solution with mutex-based synchronization. It thoroughly explains the problems and fixes, offers optional optimizations, and maintains clear structure throughout."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 10,
      "brief_justification": "The response correctly identifies all concurrency issues in the Go code, provides a well-structured solution with a mutex, explains the reasoning, and includes additional information about verification and alternative approaches."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 10,
      "brief_justification": "The response correctly identifies all concurrency issues (race conditions on shared state), provides a complete fix using mutexes, explains each problem in a clear table, and includes best practices like error reporting and race detector usage. The solution is both technically accurate and pedagogically thorough."
    },
    {
      "judge_key": "qwen3_32b",
      "judge_name": "Qwen 3 32B",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9.8,
      "brief_justification": "The response correctly identifies all concurrency issues and provides a complete, well-structured fix using mutexes. It also offers alternative approaches for deeper understanding and includes practical verification steps."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 10,
      "brief_justification": "The response correctly identifies all concurrency issues (race conditions on totalRevenue, orderCount, and errors), provides a correct and complete fix using sync.Mutex, includes an advanced atomic-based alternative with appropriate caveats, and explains the solution clearly with practical output and implementation notes."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen3_8b",
      "respondent_name": "Qwen 3 8B",
      "weighted_score": 10,
      "brief_justification": "The response correctly identifies the data race issue, provides a complete and idiomatic fix using sync.Mutex, explains all changes thoroughly, and includes clear reasoning about correctness, completeness, and thread safety."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 10,
      "brief_justification": "The response correctly identifies all three concurrency issues (non-atomic float64 addition, non-atomic int increment, and unsafe slice append), provides a complete and correct fix using sync.Mutex, explains the rationale thoroughly, and includes a working corrected code example with expected output—demonstrating deep understanding of Go concurrency primitives and best practices."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 10,
      "brief_justification": "The response correctly identifies all concurrency issues (race conditions on totalRevenue, orderCount, and errors), provides a fully correct and complete fix using sync.Mutex, explains the rationale clearly, and adds valuable depth with optional atomic/optimization suggestions and clear justification for the chosen approach."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 10,
      "brief_justification": "The response correctly identifies all three race conditions (on totalRevenue, orderCount, and errors), provides a fully synchronized fix using sync.Mutex with proper usage of defer, includes verification via race detector, and even offers an advanced alternative using atomic operations—demonstrating thorough understanding and practical guidance."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 10,
      "brief_justification": "The response correctly identifies all concurrency issues (race conditions on totalRevenue, orderCount, and errors slice), provides a fully correct and idiomatic fix using sync.Mutex, includes comprehensive analysis, best practices, and practical advice like using the race detector—making it technically flawless, thorough, and highly actionable."
    },
    {
      "judge_key": "qwen3_coder_next",
      "judge_name": "Qwen 3 Coder Next",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9.8,
      "brief_justification": "The response correctly identifies all three race conditions (totalRevenue, orderCount, errors), provides a fully correct mutex-based fix, includes verification instructions, and thoughtfully discusses alternative approaches—only minor deduction for not explicitly mentioning that float64 operations still require mutex even with atomic operations (since Go doesn't provide atomic float64 operations natively)."
    },
    {
      "judge_key": "qwen35_35b_a3b",
      "judge_name": "Qwen 3.5 35B-A3B",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 9.35,
      "brief_justification": "The response correctly identifies all three race conditions and provides a working mutex-based fix with proper locking around all shared field modifications. It also offers an optimized atomic alternative with version compatibility notes. Minor deduction for not mentioning potential lock contention in high-throughput scenarios or unbounded error slice growth."
    },
    {
      "judge_key": "qwen35_35b_a3b",
      "judge_name": "Qwen 3.5 35B-A3B",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 9.75,
      "brief_justification": "The model accurately identified and fixed all concurrency issues with a standard mutex solution, but contained a minor calculation error in the example output sum."
    },
    {
      "judge_key": "qwen35_35b_a3b",
      "judge_name": "Qwen 3.5 35B-A3B",
      "respondent_key": "qwen3_coder_next",
      "respondent_name": "Qwen 3 Coder Next",
      "weighted_score": 8.55,
      "brief_justification": "Correctly identifies all race conditions and provides working mutex solution. The first atomic solution uses unsafe.Pointer which is problematic and should not be recommended, though this is acknowledged. The Better Atomic Solution with cents is correct. Well-structured with clear explanations and practical trade-offs discussed."
    },
    {
      "judge_key": "qwen35_35b_a3b",
      "judge_name": "Qwen 3.5 35B-A3B",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 9.35,
      "brief_justification": "The response correctly identifies all three race conditions and provides a working fix with mutex synchronization. Minor deduction for the WaitGroup comment (it's not actually problematic) and the atomic operations suggestion could be more precise about float64 atomic support. Otherwise comprehensive with verification steps and alternatives."
    },
    {
      "judge_key": "qwen35_35b_a3b",
      "judge_name": "Qwen 3.5 35B-A3B",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 9.8,
      "brief_justification": "The response correctly identifies all three race conditions (totalRevenue, orderCount, errors slice) and provides a properly synchronized fix using sync.Mutex. The code is accurate, the expected output is correct (799.46 from 5 orders), and the explanation is well-structured with a helpful table and practical tips like the race detector."
    },
    {
      "judge_key": "qwen35_35b_a3b",
      "judge_name": "Qwen 3.5 35B-A3B",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9.35,
      "brief_justification": "The response correctly identifies all three race conditions and provides a working fix using mutex synchronization. It includes verification steps, alternative approaches (atomic operations, channels), and practical recommendations, making it comprehensive and highly actionable."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 8.35,
      "brief_justification": "The model correctly identified the race conditions and provided a working mutex-based fix. However, the 'Alternative' section hallucinated non-existent Go API functions (`atomic.AddFloat64`), and the example output contained a minor arithmetic discrepancy. The primary solution is robust, but the secondary suggestion is factually incorrect."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen3_8b",
      "respondent_name": "Qwen 3 8B",
      "weighted_score": 9.4,
      "brief_justification": "The response correctly identifies all data race issues and provides an accurate mutex-based solution with complete working code. It could be more complete by mentioning the race detector (go run -race) for testing, and deeper by discussing alternatives like atomic operations or channels."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 9.55,
      "brief_justification": "The response correctly identifies the data races and provides a robust mutex-based fix. The code is syntactically correct and thread-safe. Minor deductions for a factual error in the explanation (claiming `sync/atomic` supports `float64` natively, which it does not) and a minor arithmetic discrepancy in the sample output calculation, though the code logic itself is sound."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen3_coder_next",
      "respondent_name": "Qwen 3 Coder Next",
      "weighted_score": 7.55,
      "brief_justification": "The response correctly identifies the race conditions and provides a working mutex-based solution, but includes a broken atomic operations example using invalid unsafe.Pointer syntax that won't compile. The primary fix is solid, but the erroneous code samples in the atomic solutions hurt overall correctness."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 9.6,
      "brief_justification": "The response correctly identifies all three concurrency issues (race conditions on totalRevenue, orderCount, and errors slice) and provides a working solution with proper mutex protection. It includes well-structured explanations, corrected code, and valuable optimization suggestions for production scenarios."
    },
    {
      "judge_key": "qwen35_27b",
      "judge_name": "Qwen 3.5 27B",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9.6,
      "brief_justification": "The response correctly identifies all three race conditions and provides a working fix using `sync.Mutex`. It also offers valuable alternative approaches (atomics, channels) and mentions the race detector for verification. The only minor deduction in completeness is that it could have explicitly mentioned that `totalRevenue` as a float is imprecise for currency, though it does touch on this in the alternatives section."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 8.35,
      "brief_justification": "The primary mutex-based solution correctly identifies and fixes all race conditions. However, the alternative atomic approach contains a significant factual error claiming `atomic.AddFloat64` exists in Go 1.21+, which is false and would cause compilation failures."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen3_8b",
      "respondent_name": "Qwen 3 8B",
      "weighted_score": 9.55,
      "brief_justification": "The code solution correctly resolves the data races using a mutex, ensuring thread safety. However, the explanation contains a minor factual error claiming slice append is generally safe concurrently, which contradicts the need for locking."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 9.4,
      "brief_justification": "The code solution correctly resolves all concurrency issues using a mutex, but the sample output calculation in the explanation contains arithmetic errors regarding the total and order count."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen3_coder_next",
      "respondent_name": "Qwen 3 Coder Next",
      "weighted_score": 9.55,
      "brief_justification": "Correctly identifies race conditions and provides a robust, idiomatic mutex-based solution with proper locking on reads and writes. The inclusion of an unsafe atomic alternative is explicitly flagged as problematic, ensuring the user prioritizes the correct fix."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 9.8,
      "brief_justification": "The response accurately identifies all race conditions and provides a correct, mutex-based solution with clear explanations and code. It is comprehensive and actionable, though the atomic optimization note for float64 lacks specific implementation details regarding bit-casting."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen35_27b",
      "respondent_name": "Qwen 3.5 27B",
      "weighted_score": 8.75,
      "brief_justification": "The response correctly identifies all three race conditions and provides a working fix with mutex synchronization. Minor deduction for incorrectly suggesting WaitGroup usage is problematic (it's actually correct) and the mutex lock in main is unnecessary since wg.Wait() already ensures goroutine completion. Otherwise comprehensive with verification steps and atomic alternative."
    },
    {
      "judge_key": "qwen35_122b_a10b",
      "judge_name": "Qwen 3.5 122B-A10B",
      "respondent_key": "qwen35_397b_a17b",
      "respondent_name": "Qwen 3.5 397B-A17B",
      "weighted_score": 9.2,
      "brief_justification": "Correctly identifies all three race conditions and provides a working mutex-based fix with verification steps. Well-structured with alternatives and clear recommendations for different scenarios."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen35_9b",
      "respondent_name": "Qwen 3.5 9B",
      "weighted_score": 8.6,
      "brief_justification": "The primary mutex-based fix is logically sound and resolves all identified race conditions correctly. However, the suggested atomic alternative references a non-existent standard library function, which is a factual error."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen3_8b",
      "respondent_name": "Qwen 3 8B",
      "weighted_score": 9.55,
      "brief_justification": "The code fix is technically flawless and resolves all race conditions idiomatically. However, a minor factual imprecision in the explanation regarding slice append safety prevents a perfect correctness score."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen3_32b",
      "respondent_name": "Qwen 3 32B",
      "weighted_score": 9.55,
      "brief_justification": "The code correctly fixes all concurrency issues using a mutex, but the manual sample output contains calculation errors. The explanation is comprehensive and clearly structured."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen3_coder_next",
      "respondent_name": "Qwen 3 Coder Next",
      "weighted_score": 9.6,
      "brief_justification": "The model accurately diagnoses all race conditions and provides idiomatic, working solutions with clear trade-off analysis. A minor deduction is applied for a missing import in one intermediate code snippet that would cause a compilation error."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen35_35b_a3b",
      "respondent_name": "Qwen 3.5 35B-A3B",
      "weighted_score": 9.8,
      "brief_justification": "The response accurately identifies all race conditions and provides a robust, working solution with clear explanations. It loses a slight depth point for suggesting a lock is necessary after wg.Wait(), which already guarantees goroutine completion, though this is a minor defensive programming nuance."
    },
    {
      "judge_key": "qwen35_397b_a17b",
      "judge_name": "Qwen 3.5 397B-A17B",
      "respondent_key": "qwen35_122b_a10b",
      "respondent_name": "Qwen 3.5 122B-A10B",
      "weighted_score": 9.8,
      "brief_justification": "The response accurately identifies all race conditions and implements a correct mutex-based solution protecting all shared fields, supplemented by clear explanations and verification tips."
    }
  ],
  "meta": {
    "source": "The Multivac (app.themultivac.com)",
    "methodology": "10x10 blind peer matrix evaluation",
    "criteria": "correctness, completeness, clarity, depth, usefulness",
    "self_judgments": "excluded from rankings",
    "license": "Open data — cite as: The Multivac (2026)"
  }
}