# P2.2 — EQH/EQL SEMANTIC ADJUDICATION

Status: **SEMANTICS RESOLVED — parity 0/0 mismatch (14850 rows)**  
Date: 2026-08-21  
Decision: **legacy runtime/v4.4 semantics = production source of truth (provisional)**

---

## 1. Semantic differences (Python training vs EA/v4.4)

| Aspect | Python training (build_features) | EA/v4.4 (DetectEQ) |
|---|---|---|
| Pair selection | consecutive same-type pivots (skipping opposite types) | CONSECUTIVE pivots in the g_sp list (must be same type) |
| ATR basis | `EQ_TOL_ATR * A[p]` (ATR at the pivot bar) | `EQ_TOL_ATR * g_atr` (CURRENT ATR, row bar) |
| Pair window | full history | 700-bar cache, pivots valid [r-649, r-50] |
| Sweep | bar > p2 with high/low breaking the 2nd pivot price | same (bars p2+1..total) |

v4.4 `DetectEQ` (Indicators\Downloads\SniperGold_SMC_ProPlus_v4_4.mq5:671)
is IDENTICAL to the EA `DetectEQ` (AlgoForge_Backtest_Baseline.mq5:310) —
the EA copies v4.4 faithfully.

---

## 2. Reconstruction & quantitative evidence

`ml/parity/recon_eq.py` — DetectEQ reconstruction in Python over the full-history
pivot list + EA window filter:

```text
PY-training              f10 = 0.9846   f11 = 1.0000   (reproduces parity report SB-06)
RECON-A (EA pairs, ATR@pivot)   = 0.9846 / 1.0000      (pair selection NOT dominant)
RECON-B (EA pairs, ATR@row)     = 0.0523 / 0.0000      (ATR basis = dominant factor)
RECON-C (window + ATR@row)      = 0.0000 / 0.0000      (window closes the f10 remainder)
```

Dominant factor = **ATR basis** (row ATR vs pivot ATR). Secondary factor =
**pair list window** (700-bar cache, absolute pivots [r-649, r-50] because
`begin=max(100, total-600)`, `len=50`, `p_rel in [50,649]`).

Note: RECON-A == PY-training (0.9846/1.0000) shows the pair-selection difference
does NOT change the output flag on this data — the real driver is ATR.

---

## 3. Decision

```text
Chosen semantics : legacy runtime/v4.4
  - consecutive pivots in the list (g_sp[i-1], g_sp[i]), both same type
  - bar distance >= EQ_BARS (3)
  - tol = EQ_TOL_ATR (0.10) x CURRENT row-bar ATR
  - sweep: exists bar (p2, r] with high > p2.price (EQH) / low < p2.price (EQL)
  - pair list bounded by the EA analysis window (700-bar cache, pivots [r-649, r-50])

Reason : runtime reproduction 0/0 mismatch on 14850 rows; P2 policy:
         legacy runtime/v4.4 = provisional production source of truth.
         No EQH/EQL redesign in this session (recorded as a future research
         experiment: non-monotonic flag because row ATR fluctuates).

Legacy status : v4.4 semantics (EA copies v4.4 faithfully) = TRUSTED
Parity         : f10 0/14850, f11 0/14850 (Python reconstruction)
```

## 4. Training implications

`build_features` must be changed (in the P2.5 implementation):
- consecutive-list pairs, not same-type-skip;
- tol = EQ_TOL_ATR * A[i] (current bar ATR), not A[p];
- pivot list bounded by the same window as runtime (700-bar cache semantics).