docs: J7o 40 BB walkthrough Tests 1-4 (long-overdue completion)#179
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Completes the user-requested J7o (and 27o, Test 4) 40 BB walkthrough first asked for prior to the cs-bug fix (PR #165) and True Path B engine (PR #171). All four tests use the 169-class True Path B fast engine (`_rust.solve_hunl_preflop_rvr_class169`) at 10000 DCFR iterations. Tests: - T1 baseline: SB opens J7o, BB calls, equity walk preflop->flop->turn->river - T2 3-bet/4-bet: SB J7o vs BB 3-bet vs SB 4-bet vs BB call line - T3 postflop raise: J7o equity vs BB's likely raise range on A89dd (engine is preflop-only; postflop equity from MC enumeration) - T4 off-distribution: 27o + 5x open, engine crash-check + defend dist Findings: J7o opens majority at 40 BB (matches published chart); SB prefers 2x over 3x open (GTO-consistent at 40 BB stack depth); 72o folds 100%; AA opens 100%; engine doesn't crash on off-tree play. Total wall: ~52s (29s solve + 23s postflop equity MC). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This was referenced May 28, 2026
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#183) Companion to docs/j7o_walkthrough_tests_1_4_2026-05-28.md (PR #179), which reported equity only. This doc reports **actual GTO action distributions** from postflop subgame solves at each decision point — true player-POV format. Architecture per street: - Preflop: read SB's 169-class blueprint at the root infoset (||p|); J7o gets its action distribution directly. - Turn / River: call ``solve_postflop_from_blueprint`` with the preflop action sequence and the board, then extract J7o's per-class strategy and J♠7♦'s specific per-history strategy. Limitation surfaced honestly: flop subgame solves are DEFERRED. Empirical measurement (2026-05-28): the vector-form Rust solver runs > 5 minutes of CPU per flop solve at the smallest viable parameters (top-K = 4 hand classes + J7o pin, 5 DCFR iterations). The chance tree from flop to river blows up per-iter cost. Turn solves succeed in ~15s and river solves in <1s (TerminalCache amortizes the dominant evaluator cost on a constant board). Flop directional reads are from the equity-only walkthrough in PR #179. Headline result for Test 1 (J7o, 40 BB, A♦8♥9♦ 2♣ 3♠): - Preflop: open_to_200 = 92.1%, open_to_300 = 6.3%, call = 1.6%, fold ≈ 0%. The 169-class engine confirms J7o is an opening hand at this stack. - Turn (2♣): raise_33 = 30%, raise_75 = 19%, fold = 17%, raise_100 = 14%. J7o still raises a lot of the time as a polarized bluff after following BB's modal turn action. - River (3♠): all_in = 49%, bet_100 = 15%, bet_200 = 11%, check = 7%. SB bombs the river half the time (BB's modal action is check at 84.5%, so this is SB facing a checked river with J-high). Total wall time: 21.6s (preflop blueprint 4.5s, turn solve 14.7s, river solve 0.5s, overhead 1.9s). Script: scripts/run_j7o_walkthrough_full_pov.py — designed so the SKIP_FLOP_SOLVES gate can be flipped to False in a future burst once the flop-subgame perf path is improved. Depends on: PR #182 (fix(blueprint_subgame): normalize b/r token equivalence at preflop boundary), which unblocks the postflop wiring for SB's opening raise. Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
_rust.solve_hunl_preflop_rvr_class169) at 10,000 DCFR iterations; total wall ~52s (29s solve, ~23s postflop MC equity).Notes
poker_solver.equity.equity) for the flop/turn/river continuation. The postflop cbet+raise tree in Test 3 is a hypothetical (no postflop DCFR solve at this budget).Test plan
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