//@version=6
indicator("IMG 29 — Opening Range Audit", overlay=true)
// Educational observation tool. No orders, fill simulation or profitability claim.
if timeframe.in_seconds() != 900
    runtime.error("Use a standard 15-minute chart.")
string tz = "America/New_York"
int hh = hour(time, tz)
int mm = minute(time, tz)
int dayKey = year(time, tz) * 10000 + month(time, tz) * 100 + dayofmonth(time, tz)
bool newDay = ta.change(dayKey) != 0
var float rangeHigh = na
var float rangeLow = na
var int seen = 0
var bool used = false
if newDay
    rangeHigh := na
    rangeLow := na
    seen := 0
    used := false
if barstate.isconfirmed and hh == 9 and mm == 30
    rangeHigh := high
    rangeLow := low
    seen := 1
if barstate.isconfirmed and hh == 9 and mm == 45 and seen == 1
    rangeHigh := math.max(rangeHigh, high)
    rangeLow := math.min(rangeLow, low)
    seen := 2
bool ready = seen == 2 and hh >= 10
// A bar starting 11:45 closes at noon and is included.
bool inWindow = hh >= 10 and hh < 12
bool signal = barstate.isconfirmed and ready and inWindow and not used and close > rangeHigh and close[1] <= rangeHigh
if signal
    used := true
plot(ready ? rangeHigh : na, "Frozen range high", color=color.black, style=plot.style_linebr)
plot(ready ? rangeLow : na, "Frozen range low", color=color.gray, style=plot.style_linebr)
plotshape(signal, "First qualifying close", shape.triangleup, location.belowbar, color.black, size=size.small)
plot(signal ? low - syminfo.mintick : na, "Proposed stop reference", display=display.data_window)