Three Black Crows: Bearish Reversal | AlfaTactix

Practical Example: Using the Three Black Crows Indicator in a Trading Strategy

The Three Black Crows is a price action pattern used to identify potential bearish reversals through three consecutive bearish candles. In a trading strategy, the Three Black Crows indicator helps traders identify strong selling pressure and generate sell entry signals based on reversal patterns.

Scenario: You're creating a reversal strategy for EUR/USD on a daily chart. You want to sell when Three Black Crows form after an uptrend or at a resistance level (indicating strong selling pressure and potential downward reversal), with confirmation from subsequent bearish price action.

Strategy Logic:

• Identify Three Black Crows patterns: three consecutive bearish candles where each candle opens within or near the previous candle's body and closes below the previous candle's low, with progressively decreasing closes.
• Sell signal: When Three Black Crows form after an uptrend or at a resistance level (e.g., previous high, trend line, Fibonacci retracement), indicating strong selling interest and potential downward reversal.
• Confirmation: Wait for subsequent bearish price action (e.g., bearish candle closing below the pattern's low) before entering the trade.

Backtrader Example:

import backtrader as bt

class ThreeBlackCrowsReversalStrategy(bt.Strategy):
    params = dict(
        min_body_ratio=0.6  # Each candle body should be at least 60% of range
    )
    
    def __init__(self):
        self.resistance_level = None  # Set based on your analysis
        
    def is_three_black_crows(self, bar1, bar2, bar3):
        """Check if three bars form Three Black Crows pattern"""
        # All three candles should be bearish
        all_bearish = (bar1.close < bar1.open and 
                      bar2.close < bar2.open and 
                      bar3.close < bar3.open)
        
        if not all_bearish:
            return False
        
        # Check body sizes (similar sizes indicate consistent pressure)
        body1 = abs(bar1.close - bar1.open)
        body2 = abs(bar2.close - bar2.open)
        body3 = abs(bar3.close - bar3.open)
        range1 = bar1.high - bar1.low
        range2 = bar2.high - bar2.low
        range3 = bar3.high - bar3.low
        
        bodies_adequate = (body1 >= range1 * self.p.min_body_ratio and
                          body2 >= range2 * self.p.min_body_ratio and
                          body3 >= range3 * self.p.min_body_ratio)
        
        # Progressive lower closes
        progressive_lowers = (bar2.close < bar1.close and 
                             bar3.close < bar2.close)
        
        # Each opens within or near previous body
        opens_within = (bar2.open <= bar1.open and 
                       bar2.open >= bar1.close and
                       bar3.open <= bar2.open and 
                       bar3.open >= bar2.close)
        
        return (bodies_adequate and 
                progressive_lowers and
                opens_within)
        
    def next(self):
        if len(self.data) < 3:
            return
        
        bar1 = self.data[-2]
        bar2 = self.data[-1]
        bar3 = self.data[0]
        
        if not self.position:
            # Sell when Three Black Crows at resistance after uptrend
            if (self.is_three_black_crows(bar1, bar2, bar3) and 
                (self.resistance_level is None or 
                 self.data.high[-2] >= self.resistance_level * 0.999) and
                self.data.close[-5] < self.data.close[-2]):  # Uptrend
                self.sell()
        else:
            # Exit on reversal or target
            if self._exit_signal():
                self.close()
    
    def _exit_signal(self):
        # Add exit logic
        return False

# Usage
cerebro = bt.Cerebro()
cerebro.addstrategy(ThreeBlackCrowsReversalStrategy)

Expected Outcome: By using the Three Black Crows indicator, your strategy identifies potential bearish reversals through three consecutive bearish candles, helping you enter trades when strong selling pressure occurs at key levels and exit when reversal patterns complete. This approach leads to better reversal identification, improved selling pressure recognition, and enhanced entry timing by trading strong bearish reversal patterns.

Using the Three Black Crows indicator ensures your strategy trades strong bearish reversal patterns effectively, improving entry and exit timing based on objective price action analysis.