# Showdown review casebook

Ten deliberately selected, synthetic rule-application exercises. Source date: September 5, 2026. Read the article for source-linked explanations and event scope:
https://gtogecko.com/blog/poker-showdown-order

## Use
Open review-sheet.html locally or print it. Compare a completed exercise with cases.csv or cases.json. These contain identical rows. R1/R2 change the final betting street; R3 adds a raise; A1/A2/A3 distinguish later betting availability; C1/C2 concern pot claims; C3/C4 change caller card status. They are teaching controls, not a random or representative sample.

Sources: published TDA2024 rules13,16–19 and illustrations (https://www.pokertda.com/view-poker-tda-rules/); WSOP2026 rules70,72,75 (https://assets.wsopcdn.com/wsop/1a72ba28-781c-409d-a9c3-5ca13c4c5718.pdf); PokerStars final-street explanation (https://www.pokerstars.uk/poker/learn/news/who-shows-cards-first-at-the-showdown-in-poker/).

## Integrity and validation
Download every file in this folder into one directory. Run `python verify.py` there. It checks hashes, exact CSV/JSON parity and ten reviewed answer contracts. The manifest detects accidental drift, not the authenticity of a downloaded verifier or malicious changes to all files together. Human comparison with the named primary rules is the substantive validation; software cannot decide a disputed hand.

The diagram uses the article’s contested tournament/no-special-hold scope. No equity, payouts, monetary result, strategy EV, player sample, simulation, random seed or app behavior is measured. All-in exposure is a separate question from who shows first. Previously tabled winning hands, retrieval disputes, penalties, and house exceptions require staff judgment. Recheck rules before using this as a current event reference.

The sheet and diagram are original GTO Gecko editorial assets, created September 5, 2026. No third-party screenshots or copied examples.