NRBOAlgo

NARROW RANGE BREAKOUT STRATEGY

Quick Facts:

• Category: Breakout / Volatility Compression
• Markets: Futures, Forex, Stocks
• Timeframes: 15min, 1H, 4H, Daily

Overview

The Narrow Range Breakout Algorithm (NRBOAlgo) exploits one of the most reliable patterns in technical analysis: volatility compression leads to volatility expansion. When a market forms its narrowest range in N periods (NR4 = 4 periods, NR7 = 7 periods), it signals pending explosive movement.

The algorithm identifies these compression points and positions for the breakout, capturing the energy release when price finally escapes the tight range. This is a favorite pattern of institutional traders for its reliability and defined risk parameters.

How It Works

NARROW RANGE DETECTION The algorithm tracks bar range across a lookback window:

• barRange = High - Low (current bar's range)
  • narrowestRange = Lowest(barRange, nrLookback)
  • isNarrowestBar = barRange <= narrowestRange

When the current bar has the smallest range in N periods, it's flagged as a potential NR setup.

ATR FILTER Ensures the narrow range is genuinely compressed:

• rangeATRRatio = barRange / ATR
  • passATRFilter = rangeATRRatio <= maxRangeATR

This prevents triggering on naturally small bars in low-volatility environments where "narrow" is relative.

CONSECUTIVE NR TRACKING Multiple consecutive NR bars increase setup quality:

• consecutiveNR counter increments for each qualifying bar
  • Resets when a bar doesn't meet NR criteria
  • minNRBars parameter sets the threshold (default: 1)

A sequence of 2-3 NR bars suggests extreme compression.

BREAKOUT LEVEL STORAGE Once an NR pattern is confirmed:

• nrHigh = High of the NR bar(s)
  • nrLow = Low of the NR bar(s)
  • These levels define the breakout zones

BREAKOUT DETECTION Entry triggers when price exceeds NR levels:

• breakoutBuffer = ATR × breakoutBuffer (default: 0.1)
  • Long Breakout: High > nrHigh + breakoutBuffer
  • Short Breakout: Low < nrLow - breakoutBuffer

The buffer prevents false breakouts from noise.

EXPIRATION LOGIC NR setups don't last forever:

• cancelBarsAfterNR parameter (default: 5)
  • If no breakout within N bars, setup expires
  • Prevents stale levels from triggering late entries

Signal Generation

LONG SIGNAL: ✅ NR pattern identified (consecutive NR bars >= minNRBars) ✅ ATR filter passed (range is genuinely compressed) ✅ Price breaks above nrHigh + buffer ✅ Breakout occurs within cancelBarsAfterNR window ✅ VMAlgo confirmation (if enabled) ✅ Session and day-of-week filters passed

SHORT SIGNAL: ✅ NR pattern identified (consecutive NR bars >= minNRBars) ✅ ATR filter passed (range is genuinely compressed) ✅ Price breaks below nrLow - buffer ✅ Breakout occurs within cancelBarsAfterNR window ✅ VMAlgo confirmation (if enabled) ✅ Session and day-of-week filters passed

Key Parameters

NR DETECTION:

• nrLookback (7): Lookback period for NR detection (7 = NR7, 4 = NR4)
  • minNRBars (1): Minimum consecutive NR bars required
  • maxRangeATR (0.5): Maximum range as ATR ratio for compression

BREAKOUT:

• breakoutBuffer (0.1): ATR multiple above/below NR levels for entry
  • cancelBarsAfterNR (5): Bars until NR setup expires

VMALGO INTEGRATION:

• useVMConfirmation (true): Require momentum confirmation

Best Use Cases

✅ DAILY NR7 BREAKOUTS for swing trading ✅ INTRADAY NR4 SETUPS during session opens ✅ PRE-NEWS COMPRESSION before high-impact events ✅ RANGE BOUND MARKETS awaiting directional resolution ✅ VOLATILITY EXPANSION trades after quiet periods

Optimization Tips

FOR CLASSIC NR7 (DAILY): • nrLookback = 7 • minNRBars = 1 • maxRangeATR = 0.5 • breakoutBuffer = 0.1-0.15 • cancelBarsAfterNR = 3-5

FOR AGGRESSIVE NR4 (INTRADAY): • nrLookback = 4 • minNRBars = 1 • maxRangeATR = 0.6 • breakoutBuffer = 0.05 • cancelBarsAfterNR = 3

FOR EXTREME COMPRESSION: • Increase minNRBars to 2-3 • Lower maxRangeATR to 0.3-0.4 • Higher conviction but fewer signals

FOR SESSION-SPECIFIC: • Use Asian session NR patterns • Trade the London/NY breakout • Configure sessions accordingly