Why 14-period RSI fails at the open
Standard RSI settings smooth over gap risk on the SET open. Here is the pre-market adjustment we teach in the Ladya Road room.
The Bangkok SET open carries gap risk that a default 14-period RSI on a daily chart will not surface until mid-morning. Traders arriving at our workshop with overnight news already priced in often find RSI still sitting in neutral territory while price has jumped two percent.
We ask participants to duplicate their chart view thirty minutes before the open and mark where RSI stood at yesterday's close on a four-hour pane. When the opening print gaps beyond that level, the first hour's RSI reading is treated as provisional — logged in the journal but not used for entry confirmation until at least three four-hour candles print.
This is not an argument against 14-period settings entirely. On settled midday ranges, the default period still aligns well with how most Thai liquid names oscillate. The adjustment is contextual: at the open, drop to a 7-period RSI on the four-hour chart only for logging purposes, then revert once volume normalises.
In the room we print yesterday's close, today's open, and the first RSI print side by side. Traders who skip that step often chase the gap and mark divergence after the fact. The exercise takes five minutes and prevents the most common misread we see on Monday workshops.
If you trade primarily mid-session, this open-specific rule matters less. For anyone with entries between 09:55 and 10:30, it belongs in your checklist above any indicator preset.