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Probing entries: small first, bigger on confirmation

Some scalpers start with a small position and add if the trade works. The idea is to test the market's reaction before committing size.

Done well, it reduces the cost of being wrong. A failed probe loses little. A successful one gets scaled up.

The cost is complexity and spread. Each addition pays the spread again. The average entry price is worse than a full-size entry at the original price. If most signals work, the strategy is less profitable than going in full.

A deeper issue is that the add happens after the market has already moved in the trader's favor. The new position starts closer to the target and carries a worse reward-to-risk ratio.

The approach makes sense when signals are uncertain and the first moments of price action contain real information. It makes less sense when the edge comes from the entry price itself.

Testing is the answer. Simulate the same signals with full-size entries and with probe-plus-add entries, with realistic costs. Compare the total return and the drawdown.

For many scalping strategies, the simplest approach, one entry, one exit, wins.

Has the probe-and-add approach beaten a single full-size entry in the records?

I tested this on my own breakout setup on GBPUSD over about 300 trades from my journal, simulating a half-size probe and adding the rest after a three pip move in my favour. The probe version had a noticeably smaller worst drawdown, but total return was lower by roughly a fifth, mainly because the add came at a worse price and I paid the spread twice on every winner.

What surprised me was how often the add got stopped out. A fair number of my trades moved three pips in my direction and then pulled back to the entry before running, so the added position was the one that lost while the probe survived. That pattern alone made the approach look worse on paper than I expected.

I ended up keeping a single full-size entry for that setup, as you suggest. The only place I still probe is at session extremes where I'm genuinely unsure, and there I treat the small first trade as the whole trade unless the market clearly confirms within a minute.