[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10},"actionData","errors","root",{"_337":-5,"_338":-5,"_339":-5,"_340":-5,"_341":27,"_342":343},"routes/competition",{"_13":14,"_15":16,"_17":18,"_19":20,"_21":-5,"_22":23,"_24":25,"_26":27},"routes/competition.submissions",{"_11":12},"mine",[],"competition",{"_35":267,"_268":269,"_90":270,"_271":272,"_273":274,"_275":276,"_277":278,"_279":280,"_281":282,"_283":284,"_285":286,"_287":288,"_289":290,"_291":292,"_293":-5,"_294":295,"_296":46,"_297":258,"_298":299,"_300":25,"_301":257,"_302":303,"_304":305,"_306":307,"_308":309},"evaluation",{"_28":29,"_30":31,"_32":33,"_34":-5},"entry","signed_out","email","","participation","daysLeft",14,"joinable",true,"full",false,"datasets",{"_229":230,"_231":232,"_233":234},"settings",[188,189,190,191,192],"evaluator",{"_35":36,"_37":38,"_39":40,"_41":42,"_43":44,"_45":46,"_47":48},"final_published_at","id","sudoku","name","Sudoku","facts",[155,156,157,158,159,160,161,162],"guide",{"_71":72,"_73":74,"_75":76,"_77":-5,"_78":79},"scoring",{"_49":50,"_51":52,"_53":54,"_55":56,"_57":58},"version",3,"description","A prompt that helps the model solve Sudoku puzzles. Every puzzle has exactly one solution and is scored by the grid the model returns.","unit","%","metric","Solve rate: puzzles solved ÷ all puzzles. A puzzle the model gave no readable grid for counts as not solved.","decimals",1,"outcomes",{"_59":60,"_61":62,"_63":64,"_65":66,"_67":68,"_69":70},"tiebreak","Cell accuracy: empty cells filled correctly ÷ all empty cells, over every puzzle.","failed","No grid: the model timed out, ran out of tokens, refused, or the grid couldn't be read.","solved","The grid equals the puzzle's unique solution.","invalid","Every given kept and no blanks, but a row, column or box repeats a symbol.","incomplete","The grid leaves at least one cell blank.","alt_solution","A valid grid that keeps every given but differs from the solution. Impossible for a unique puzzle; expected never to happen.","givens_changed","The grid overwrites at least one given cell.","input","The model gets your prompt as its only message, with {puzzle} replaced by the puzzle's grid. If your prompt has no {puzzle}, the grid goes first, then a blank line, then your prompt. Nothing else is added: not the rules, no instructions and no answer format, so your prompt has to explain the task and ask for an answer we can read.","answer",{"_145":146,"_77":147,"_47":148},"groups",[84,85],"example","placeholders",[80],{"_37":81,"_77":82,"_47":83},"{puzzle}",". . | 1 2\n1 . | 4 3\n----+----\n2 . | 3 .\n4 3 | . 1","The grid and nothing else: one row per line, cells separated by spaces, empty cells as dots, and \"|\" and \"-\" lines marking the boxes. Symbols are 1–9, then A–G on grids bigger than 9×9. Grids can be 4×4 grid, 6×6 grid, 9×9 grid, 12×12 grid, 16×16 grid; the Datasets section of this page shows the mix. The rules aren't included, so say what you need the model to know.",{"_86":129,"_88":130,"_90":131,"_92":132},{"_86":87,"_88":89,"_90":91,"_92":93},"rows",[99,100,101,102,103],"about","Easy and medium are exact. Hard varies from puzzle to puzzle; these ranges are from a sample of generated puzzles.","title","Cells given by grid size","columns",[94,95,96,97,98],"Grid","Boxes","Easy","Medium","Hard",[124,125,126,127,128],[119,120,121,122,123],[114,115,116,117,118],[109,110,111,112,113],[104,105,106,107,108],"16×16 (256 cells)","4×4","154","116","About 100–110","12×12 (144 cells)","3×4","87","65","45–53","9×9 (81 cells)","3×3","49","37","22–26","6×6 (36 cells)","2×3","22","17","9–11","4×4 (16 cells)","2×2","10","8","4–5",[136,137,138],"Difficulty is how many cells are given. Every puzzle has exactly one solution, checked by two independent solvers. \"Simple deduction\" means repeatedly finding a cell that has only one symbol left, or a symbol that has only one place left in a row, column or box.","Difficulty",[133,134,135],"Level","Cells given","What it usually takes",[96,143,144],[97,141,142],[98,139,140],"As few as possible: clues are removed until taking away any other one would allow a second solution","From 9×9 up, usually more than simple deduction: tracking candidates, eliminations or trying a value and backing out.","About 45%","Simple deduction up to 12×12; 16×16 ones often need more.","About 60%","Simple deduction, on every grid size.","rules",[149,150,151,152,153,154],"\n3 4 1 2\n1 2 4 3\n2 1 3 4\n4 3 2 1\n","Put the completed grid inside tags: one row per line from top to bottom, the symbols of a row separated by single spaces. Only a complete grid that keeps every given and follows the rules counts as solved.","We read the last block. Without one, we take the last complete grid anywhere in the reply: it's scored the same, but counted as a format deviation.","A row can also be written without spaces (1234), with a label such as \"Row 3:\", or with | , ; [ ] ( ) between symbols. Separator lines such as ----+---- are skipped.","Letters can be either case, and on grids bigger than 9×9 the numbers 10–16 are read as A–G.",". 0 _ ? x count as blank cells, and a grid with a blank isn't solved.","Text inside , , or tags is ignored.","A reply cut off by the output token limit, or still running at the timeout, scores as not solved.",{"_163":185,"_165":186,"_167":187},{"_163":182,"_165":183,"_167":184},{"_163":179,"_165":180,"_167":181},{"_163":176,"_165":177,"_167":178},{"_163":173,"_165":174,"_167":175},{"_163":171,"_165":172,"_167":170},{"_165":169,"_167":170},{"_163":164,"_165":166,"_167":168},"hint","Every puzzle is proven to have exactly one solution by two independent solvers.","label","Puzzle generator","value","1.1.0","Scoring version","1","Each puzzle is asked once; no averaging over repeats.","Runs per puzzle","Fix the setting or the secret, then requeue failed submissions.","Bad key or unknown model","Fails the submission at once","They're the model's answer and count as wrong.","What's never retried","Timeouts, cut-off, unreadable or refused replies","Waits 5 s, doubling up to 60 s, or longer if the reply says Retry-After. A task whose tries run out stays empty and the submission fails; requeue it from the Runs tab.","What's retried","Only calls with no reply: rate limits, server errors and overload, dropped connections","Current Claude models only take their default.","Temperature","Model default","api.anthropic.com, authenticated with the API key, replies streamed.","Provider","Claude API (Anthropic)",{"_193":226,"_49":-5,"_165":227,"_167":228,"_198":-5},{"_193":207,"_49":-5,"_165":208,"_167":209,"_198":210},{"_193":203,"_49":204,"_165":205,"_167":206,"_198":-5},{"_193":199,"_49":200,"_165":201,"_167":202,"_198":-5},{"_193":194,"_49":195,"_165":196,"_167":197,"_198":-5},"key","max_prompt_chars","characters","Longest prompt",4000,"options","timeout_s","seconds","Timeout per call",600,"max_output_tokens","tokens","Output token limit",128000,"effort","Effort","default",[211,212,213,214,215,216],{"_165":184,"_167":209},{"_165":224,"_167":225},{"_165":97,"_167":223},{"_165":221,"_167":222},{"_165":219,"_167":220},{"_165":217,"_167":218},"Max","max","Extra high","xhigh","High","high","medium","Low","low","model","Model","claude-haiku-5-5","public_test",{"_235":261,"_237":262},"downloadable",{"_235":253,"_237":254},"private_test",{"_235":236,"_237":238},"items",440,"summary",{"_239":240,"_241":168},"counts",{"_242":243,"_244":245,"_246":245,"_247":243,"_248":243,"_249":245,"_250":251,"_252":243},"generator_version","2x3-hard",40,"3x3-hard",60,"3x4-hard","4x4-easy","4x4-hard","3x3-medium","3x4-medium",100,"4x4-medium",68,{"_239":255,"_241":168},{"_256":257,"_242":258,"_244":258,"_246":259,"_247":260,"_248":257,"_249":258,"_250":23,"_252":257},"2x2-easy",5,10,7,2,88,{"_239":263,"_241":168},{"_242":264,"_244":265,"_246":265,"_247":264,"_248":264,"_249":265,"_250":266,"_252":264},8,12,20,"2724abe0-609b-4309-bcaf-26d35fa16334","slug","t16hy178h85","Sudoku 101","tagline","The first-ever competition on Renbu","category","Prompting","tags",[38,336],"host","Renbu","coverImage","https://pnytgiibrvyaugdsuykn.supabase.co/storage/v1/object/public/media/competitions/6817d610-4ccd-49df-8294-e27d8168a505.jpg","prize","$0","prizeAmounts",[],"status","active","startsAt","2026-10-29T15:32:00+00:00","endsAt","2026-11-15T14:59:00+00:00","timezone","Asia/Tokyo","joinDeadline","submissionKind","prompt","dailyLimit","playgroundDailyLimit","participantLimit",50,"waitlist","dropInactiveAfterDays","blocks",[310,311,312,313,314,315,316],"participants",6,"waitlisted",0,"submissions",13,{"_35":334,"_318":319,"_320":335},{"_35":332,"_318":323,"_324":260,"_319":333},{"_35":330,"_318":319,"_320":331},{"_35":328,"_318":323,"_324":46,"_319":329},{"_35":326,"_318":319,"_320":327},{"_35":322,"_318":323,"_324":46,"_319":325},{"_35":317,"_318":319,"_320":321},"eed95275","type","text","markdown","Put the completed grid inside `` tags: one row per line from top to bottom, the symbols of a row separated by single spaces. Only a complete grid that keeps every given and follows the rules counts as solved.\n\nFor the puzzle above:\n\n```\n\n3 4 1 2\n1 2 4 3\n2 1 3 4\n4 3 2 1\n\n```\n\n- We read the last `` block. Without one, we take the last complete grid anywhere in the reply: it's scored the same, but counted as a format deviation.\n- A row can also be written without spaces (1234), with a label such as \"Row 3:\", or with | , ; [ ] ( ) between symbols. Separator lines such as `----+----` are skipped.\n- Letters can be either case, and on grids bigger than 9×9 the numbers 10–16 are read as A–G.\n- `.` `0` `_` `?` `x` count as blank cells, and a grid with a blank isn't solved.\n- Text inside ``, ``, `` or `` tags is ignored.\n- A reply cut off by the output token limit, or still running at the timeout, scores as not solved.","936596a9","heading","level","The answer we accept","0d480b1d","The grid and nothing else: one row per line, cells separated by spaces, empty cells as dots, and \"|\" and \"-\" lines marking the boxes. Symbols are 1–9, then A–G on grids bigger than 9×9. Grids can be 4×4, 6×6, 9×9, 12×12 or 16×16; the Data tab shows the mix. The rules aren't included, so say what you need the model to know.\n\nFor example:\n\n```\n. . | 1 2\n1 . | 4 3\n----+----\n2 . | 3 .\n4 3 | . 1\n```","61be34f2","What's in {puzzle}","3fc8f45b","The model gets your prompt as its only message, with `{puzzle}` replaced by the puzzle's grid. If your prompt has no `{puzzle}`, the grid goes first, then a blank line, then your prompt. Nothing else is added: not the rules, no instructions and no answer format, so your prompt has to explain the task and ask for an answer we can read.","bb07dedb","Writing your prompt","316988cd","Prompts can have a huge impact on LLM performance, both in research and in real-world applications.\n\nThat’s why Renbu is hosting its first-ever prompt engineering competition, challenging participants to solve Sudoku puzzles using nothing but prompt engineering.\n\nEveryone competes on a level playing field. All participants use the same model, Claude Haiku 5.5, with the same effort and temperature settings.\n\nTo keep the competition fair, submissions are limited to 3 per day. Make the most of them! Download the [dev set](/competitions/t16hy178h85/data) to test your prompts locally, or try them in the [Playground](/competitions/t16hy178h85/playground), before submitting.\n\nReady to put your prompt engineering skills to the test? Submit your prompt and see if you can claim the top spot on the leaderboard!","Puzzle","user","profile","timeZone","cookieZone","cookieNoticeSeen","origin","https://renbu.ai"]

Sudoku 101

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