Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Final standings with tie-breaks for a club Swiss tournament (Buchholz Cut-1 with virtual opponents, Sonneborn-Berger, direct encounter)

AClaude Haiku 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-20 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first tryCompare

Estimated cost: $0.0086
Wall time: 40s
Human step-ins: 0
Outcome: Pass

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Exact prompt

# Final standings with tie-breaks for a club Swiss tournament `players.csv` (name, rating) and `results.csv` (round, white, black, result; rows in any order) hold a finished event. Write `standings.py` (Python 3 stdlib only) that, run as `python standings.py` in a directory with those two files, writes `standings.csv`. We also run it on other events, so do not hard-code anything. ## Results 1. `result` is `1-0`, `0-1`, `1/2-1/2` (games played over the board), `+-` / `-+` (forfeit: white / black gets 1 point, the other 0; **not** played over the board), or, with `black` empty, `BYE` (white gets 1 point) or `HALF` (white gets 1/2). A player with no row in a round got 0 points that round. R = the highest round number in the file. 2. **Points** = sum of points from all rows. ## Tie-breaks (higher is better at every step) 3. **Buchholz Cut-1 (`bh_cut1`)**: for each round 1..R take a contribution: the opponent's final points if the player played that round **over the board**, otherwise (bye, half bye, forfeit win or loss, absent) the player's **own** final points. Sum all R contributions and subtract the single smallest one. 4. **Sonneborn-Berger (`sb`)**: sum over games played over the board of opponent's final points x points the player scored in that game (1, 1/2 or 0). Unplayed rounds add nothing. 5. Rank by points, then bh_cut1, then sb. 6. **Direct encounter**: players still equal on all of points, bh_cut1 and sb form a group. If the group has 2+ players **and every pair in it played each other over the board** (in some round), order them by points scored in over-the-board games against other group members. Otherwise this step does nothing for the group. 7. Remaining ties: more over-the-board wins (forfeit wins do not count), then higher rating, then name (ascending, plain string order). 8. Use exact arithmetic (all values are multiples of 1/4). ## Output 9. `standings.csv`: header `rank,name,points,bh_cut1,sb,wins`; ranks 1..n without gaps (every player gets a distinct rank); `points` and `bh_cut1` with 1 decimal, `sb` with 2 decimals, `wins` = over-the-board wins as an integer. Every player in `players.csv` is listed. ## Scoring Hidden checks (partial credit = fraction passed; all must pass), each comparing `standings.csv` exactly: `fixture_exact` (this directory's files), `forfeits_and_byes` (1-2, 7), `buchholz_virtual` (3), `sonneborn_berger` (4), `direct_encounter` (6), `final_tiebreaks` (7), `fresh_event_exact` (a freshly generated event). Each run has a 30-second limit.

Forfeits count for points but not for tie-breaks, unplayed rounds use the player's own score, Cut-1 drops one contribution, direct encounter applies only when every pair in a tie group met over the board; hand-made events isolate each rule. Original benchmark task written for usecaserank.com (not based on a specific public post). Headless, offline run on a reproducible fixture. Each run's notes say how its cost was measured (estimates are marked).

Success criteria: 1. fixture_exact 2. forfeits_and_byes 3. buchholz_virtual 4. sonneborn_berger 5. direct_encounter 6. final_tiebreaks 7. fresh_event_exact

Setup notes: Use Case Scout batch 8 case i08-swiss-tiebreak-standings (offline fixture). Prepared with batch8/prepare.sh; hidden key/tests kept outside the agent's work dir. Prompt = TASK.md verbatim. Scored with the scout's scorer: `python score.py WORKDIR KEYDIR`. Tools: Read/Write/Edit/Glob/Grep/Bash, web disabled. Single run, no retries. Claude Code's own reported cost for claude-haiku-5.5: $0.008607. Score: 7/7. Cost is an ESTIMATE: measured tokens x pricing.json list price (Claude Pro subscription, nothing billed); input_tokens include cache reads and writes. Single run.

Estimated cost List-price estimate; not actually billed.

Metrics

Estimated cost: $0.0086
Wall time: 40s
Human step-ins: 0
Turns: 6

Model usage
Model	Input tok	Output tok	Cost
AClaude Haiku 5.5anthropic/claude-haiku-5.5effort default (no --effort flag) · thinking on	142,626	7,896	$0.0086

Reproduce this run

Use the use case prompt on the use case page.
Same setup: Claude Haiku 5.5 (anthropic/claude-haiku-5.5, effort default (no --effort flag) · thinking on) via Claude Code 2.1.299 (headless -p), cloud.
It counts as a success only if it meets every success criterion: 1. fixture_exact 2. forfeits_and_byes 3. buchholz_virtual 4. sonneborn_berger 5. direct_encounter 6. final_tiebreaks 7. fresh_event_exact
Log model, tokens, wall time, human step-ins and the evidence log, then submit it as a reproduction. A different model? Submit a head-to-head rerun.

How runs are scored: Methodology.

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Automated checks

Trust 80% comes from these checks (how Trust % works).

Run date is not in the future : passed
Model is in the dated pricing table : passed
Cost recomputed from tokens matches : passed
Cached tokens are consistent : passed
Output throughput is plausible : passed
Autonomy matches step-ins : passed
Step-ins do not exceed turns : passed
Retries agree with first-try result : passed
Evidence log SHA-256 matches : passed
Evidence log is substantial : passed

Evidence log

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  "permission_denials": [],
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  "result": "I wrote `standings.py` in the work directory and ran it against this event. It produced `standings.csv` with all 15 players ranked 1 to 15 and no ties left unresolved.\n\nSpot checks against the fixture:\n- **Hana Ito** (3.0 points): byes in rounds 1, 5 and 7 give 3 points, and every over-the-board game is a loss, so SB is 0.00. Her row matches.\n- **Max Feld / Cleo Park / Eli Stone** all have 4.5 points but different bh_cut1 values, so the direct-encounter step does not apply to them.\n\nI did not test the direct-encounter and forfeit branches in isolation. The fixture doesn't exercise them, so a synthetic event would be the next check.\n\nImplementation choices the spec left open:\n- **Names** are stripped of surrounding whitespace before matching.\n- **Players who appear only in results** are kept in the output with rating 0 rather than dropped or causing an error.\n- **Unknown result codes** raise a `ValueError` naming the offending game, instead of being silently scored as zero.\n- **Direct encounter** is applied as a sort key computed only within each group of players tied on points, bh_cut1 and SB, and only when every pair in that group met over the board. Otherwise the key is zero and the step does nothing.",
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]