Multi-Day GG by Weekday

When the weekly Golden Gate opens, does the weekday it opens on change the odds it completes?
What a "multi-day Golden Gate" is

In Saty Multiday mode, the ATR levels are built from the weekly 14-period Wilder ATR and the prior week's close (PWC) — so they reset every Monday and apply all week.

The Golden Gate is the zone from ±38.2% to ±61.8% of that weekly ATR away from PWC. A gate opens when price reaches ±38.2%; it completes when price reaches ±61.8%. Beyond that, ±78.6% and a full weekly ATR (±100%) are the continuation marks.

For each week and each direction we find the first weekday price reaches the 38.2% open level, then ask whether the gate completes (reaches 61.8%) on any day through that week's Friday, and how far it continues. The two directions are scored independently — a single week can open an upside gate, a downside gate, or both.

Headline

Completion is mostly a race against the clock — open early in the week and the gate usually completes; open Thursday or Friday and it usually doesn't.

An open with the whole week ahead of it (Monday) completes the 61.8% gate ~74–78% of the time. By Friday only 1 session remains and completion collapses to 16% (up) / 39% (down). When it does complete, it's fast — a median of ~1 session from open to completion.

It is not symmetric. The downside gate completes faster and more reliably late in the week, slams to 61.8% the same day it opens ~35–38% of the time (vs ~21% for the upside), and continues harder past the gate. Stairs up, elevator down — even on the weekly frame.

Pick the direction
Completion by the weekday the gate opens

Chance the gate completes (±61.8%) that same week

Bar = share of opens on that weekday that complete the gate by Friday. Blue tick = share that open & complete the same day. Right column: n opens · median sessions left in the week.
completes by Friday opens & completes same day
Upside vs downside — is it symmetric?

Completion rate, side by side

Green = upside gate completes, orange = downside gate completes, by the weekday each opens. The gap that opens up at Thu/Fri is the asymmetry.
Early in the week the two sides track each other (Mon/Tue within a few points). The split appears late: a Thursday downside gate still completes 55% of the time vs 41% for the upside, and Friday is 39% vs 16%. Down-moves don't need the whole week — they get there faster.
Continuation — once it completes, how far does it run?

Continuation past the gate, given it completed

Of the opens that completed (±61.8%), how many pushed on to ±78.6% and to a full weekly ATR (±100%) — by the weekday the gate opened. Raw x/n shown: these are conditional on completion, so late-week cells are tiny (n in the teens). A 0.0% there means "none of a handful," not "impossible."
Method & caveats

Data: FirstRateData SPX cash index, daily bars, 2000-11-27 → 2026-05-01 (1,313 weeks). Levels from the prior weekly close + one-week-lagged weekly Wilder ATR(14), matching the day-mode lag convention used elsewhere on this site.

Open / complete detection uses daily highs and lows, so a gate can open and complete on the same session (counted as "same-day"). Each direction is evaluated independently per week.

The clock confound: weekday-of-open and sessions-left-in-week are nearly the same axis (Mon≈5 left, Fri=1). Most of the completion decay is mechanical — fewer sessions to reach 61.8%. The interesting signal is the up-vs-down gap at equal weekdays, and the same-day completion rate, which is time-independent.

Caveats: continuation rates are conditional on completion, so Thursday/Friday cells run small (n<50, flagged faded). SPX is the cash index (no overnight gap inside the week's range the way a tradable would gap), so map onto SPY/ES with care.