The rules

Risk 1% of equity per trade. Position size is calculated from your stop distance — never chosen first.
2% and 3% are also allowed, so you can see what size does to a streak. Those trades are flagged in the journal and cost discipline points.
Only take trades with at least 2:1 reward to risk, measured from the actual fill.
One open trade at a time.
Every trade has a stop at a technical invalidation level. Stops may be tightened, never widened.
After 3 losses in a row, the session locks. Review before trading again.
No trades while feeling FOMO or the urge to win money back.
Write the thesis and trigger before entry; review every trade afterwards.

Why 2% and 3% exist

The rule stays at 1%. The larger sizes are there to be felt, not recommended: the same stop, the same target, the same R — only the money changes.

1% — rule size: one stop-out costs $1000 of a $100,000 account · three of them cost 3%
2% — double the rule: one stop-out costs $2000 of a $100,000 account · three of them cost 6%
3% — triple the rule: one stop-out costs $3000 of a $100,000 account · three of them cost 9%

Market orders fill at the next bar's open. If that open is already past your stop or target, the order is cancelled.
If a bar opens beyond your stop, you're filled at the open — this is how Black Monday stops behaved.
Otherwise stops fill at the stop minus slippage: 5% of that bar's range, multiplied by how large the bar is versus the 20-bar average (up to 4×).
If stop and target are both inside one bar, the simulator assumes the stop hit first.
No commissions, financing or spreads are modelled. Real results would be worse.

Every market condition is built from daily closing data: trade it on daily bars, or switch to weekly for the slower view.
Black Monday has more options than the rest — the 5-minute opening-bell session, on top of daily and weekly.
Because the other scenarios are daily, a stop is only checked once per bar: a move that happened and reversed inside a day is invisible to the simulator.