CONTEXT:
UNIVERSE: SP500
BASE_TZ: America/New_York
CAPITAL: 1_000_000

PARAMS:
sym="{{sym}}", 
fast_ema=10,           // Fast EMA period for momentum
slow_ema=26,           // Slow EMA period for trend direction
vol_pace_threshold=3,// Volume pace must exceed 2.5x avg
atr_period=26,         // ATR period for risk calculation
atr_mult=2.0,          // ATR multiplier for stop loss
risk_frac=0.0313,        // Risk fraction per trade
gap_threshold=1    // Gap threshold of 2% (2 as multiplier)

STRATEGY "AI Strategy - Overnight Gap Momentum-048718 + Mut":
TRIGGER:
  // Check for overnight gap > 1%
  LAST(OPEN(sym, 1d)) / LAST(CLOSE(sym, 1d), 4) > gap_threshold
  AND
  // Higher timeframe trend confirmation (1d EMA alignment)
  EMA(CLOSE(sym, 1d), fast_ema) > EMA(CLOSE(sym, 1d), slow_ema)
  AND
  // Volume pace confirmation (must exceed threshold)
  VOL_PACE(sym, 1d, 10) > vol_pace_threshold
  AND
  // Restrict to first 90 minutes of session (UTC time for US market open 9:30 AM ET)
  TIME_UTC_IN("10:30", "15:00")
ENTRY: MARKET          // Market entry to capture immediate momentum post-gap
EXIT: 
  CROSSUNDER(CLOSE(sym,1m), MID(DONCHIAN(HIGH(sym,1m), LOW(sym,1m), 20))) OR TIME_UTC_IN(20, 21)
RISK: ATR_STOP(atr_mult) // Risk management using ATR-based stop
SIZING: FIXED_FRACTION(risk_frac) // Fixed fraction sizing for consistent risk