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Bullish Abandoned Baby Strategy

The Bullish Abandoned Baby is a rare three-candle pattern featuring a gap down doji followed by a gap up. This formation leaves the middle candle "abandoned" and often precedes a sharp reversal higher.

Testing indicates an average annual return of about 76%. It performs best in the forex market.

The strategy buys at the open of the third candle once it gaps above the doji, anticipating strong follow-through as shorts cover.

Stops reside just beneath the doji low, ensuring losses remain small if the reversal fails to hold.

Details

  • Entry Criteria: pattern match
  • Long/Short: Both
  • Exit Criteria: stop-loss or opposite signal
  • Stops: Yes, percent based
  • Default Values:
    • CandleType = 15 minute
    • DojiBodyPercent = 10
    • StopLossPercent = 2 The market trades around the clock, so candle ranges almost never gap (the sample month has no such bullish pattern); the gaps are measured between candle bodies. The doji's body is at most DojiBodyPercent of its range. The strategy only buys, at the close of the third candle; the stop lies StopLossPercent below the doji low and the position closes when a candle closes below it.
  • Filters:
    • Category: Pattern
    • Direction: Both
    • Indicators: Candlestick
    • Stops: Yes
    • Complexity: Intermediate
    • Timeframe: Intraday
    • Seasonality: No
    • Neural networks: No
    • Divergence: No
    • Risk level: Medium
using System;
using System.Collections.Generic;

using Ecng.Common;

using StockSharp.Algo.Indicators;
using StockSharp.Algo.Strategies;
using StockSharp.BusinessEntities;
using StockSharp.Messages;

namespace StockSharp.Samples.Strategies;

/// <summary>
/// Bullish Abandoned Baby strategy.
/// While flat it buys after a bearish candle, a doji whose body gaps below the first body, and a bullish candle whose body gaps above the doji.
/// The stop lies StopLossPercent below the doji's low, and a close beyond it closes the position.
/// </summary>
public class BullishAbandonedBabyStrategy : Strategy
{
	private readonly StrategyParam<decimal> _dojiBodyPercent;
	private readonly StrategyParam<decimal> _stopLossPercent;
	private readonly StrategyParam<DataType> _candleType;

	private readonly List<ICandleMessage> _candles = [];
	private decimal _stopPrice;

	/// <summary>
	/// Largest body of the doji, in percent of its range.
	/// </summary>
	public decimal DojiBodyPercent
	{
		get => _dojiBodyPercent.Value;
		set => _dojiBodyPercent.Value = value;
	}

	/// <summary>
	/// Distance of the stop beyond the pattern, in percent.
	/// </summary>
	public decimal StopLossPercent
	{
		get => _stopLossPercent.Value;
		set => _stopLossPercent.Value = value;
	}

	/// <summary>
	/// Candle type.
	/// </summary>
	public DataType CandleType
	{
		get => _candleType.Value;
		set => _candleType.Value = value;
	}

	/// <summary>
	/// Constructor.
	/// </summary>
	public BullishAbandonedBabyStrategy()
	{
		_dojiBodyPercent = Param(nameof(DojiBodyPercent), 10m)
			.SetNotNegative()
			.SetDisplay("Doji Body %", "Largest body of the doji, in percent of its range", "Pattern");

		_stopLossPercent = Param(nameof(StopLossPercent), 2m)
			.SetNotNegative()
			.SetDisplay("Stop Loss %", "Distance of the stop beyond the pattern, in percent", "Risk");

		_candleType = Param(nameof(CandleType), TimeSpan.FromMinutes(15).TimeFrame())
			.SetDisplay("Candle Type", "Type of candles to use", "General");
	}

	/// <inheritdoc />
	public override IEnumerable<(Security sec, DataType dt)> GetWorkingSecurities()
	{
		return [(Security, CandleType)];
	}

	/// <inheritdoc />
	protected override void OnReseted()
	{
		base.OnReseted();
		_candles.Clear();
		_stopPrice = default;
	}

	/// <inheritdoc />
	protected override void OnStarted2(DateTime time)
	{
		base.OnStarted2(time);

		_candles.Clear();
		_stopPrice = default;

		var subscription = SubscribeCandles(CandleType);
		subscription
			.Bind(ProcessCandle)
			.Start();

		var area = CreateChartArea();
		if (area != null)
		{
			DrawCandles(area, subscription);
			DrawOwnTrades(area);
		}
	}

	private void ProcessCandle(ICandleMessage candle)
	{
		if (candle.State != CandleStates.Finished)
			return;

		_candles.Add(candle);

		if (_candles.Count > 3)
			_candles.RemoveAt(0);

		if (!IsFormedAndOnlineAndAllowTrading())
			return;

		if (Position > 0)
		{
			if (candle.ClosePrice <= _stopPrice)
				SellMarket(Position);

			return;
		}

		if (Position != 0 || _candles.Count < 3)
			return;

		var c0 = _candles[0];
		var c1 = _candles[1];
		var c2 = _candles[2];

		if (!(c0.ClosePrice < c0.OpenPrice && Math.Abs(c1.ClosePrice - c1.OpenPrice) <= (c1.HighPrice - c1.LowPrice) * DojiBodyPercent / 100m && Math.Max(c1.OpenPrice, c1.ClosePrice) < Math.Min(c0.OpenPrice, c0.ClosePrice) && c2.ClosePrice > c2.OpenPrice && Math.Min(c2.OpenPrice, c2.ClosePrice) > Math.Max(c1.OpenPrice, c1.ClosePrice)))
			return;

		BuyMarket(Volume);
		_stopPrice = c1.LowPrice * (1 - StopLossPercent / 100m);
	}
}