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Position Math

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Blog

Practical notes on risk, position sizing, prop-firm rules and the market mechanics behind the calculators.

2 articles

Latest notes

01

How Much Should You Bet? Kelly, Half-Kelly, and the 60/40 Coin Game That Bankrupted the Pros

Everyone asks what to buy. Almost nobody asks how much, yet that second question is the one that decides whether you survive.

02

How much should you risk per trade? A drawdown-first answer.

The familiar 1% rule starts with a percentage. A better answer starts with the losing streak and drawdown your account must survive.

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