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Notes from the desk.

Replay mechanics, fill-engine internals, scanner research, and what we're building next.

  1. Bar Replay vs. a Real Replay Desk: What Each One Can Actually Teach You

    · tools · practice · execution

    Chart replay tools and execution replay desks solve different problems. Knowing which problem you have saves you months of practicing the wrong thing.

  2. Slippage Has Three Sources, and They Need Three Different Fixes

    · execution · slippage · fills

    One slippage number tells you nothing. Split it into chasing, late entry, and spillover, and each piece points at a specific thing you did wrong.

  3. Why Paper-Trading Fills Lie

    · execution · paper-trading · fills

    Paper trading fills you at the price you asked for. Real markets don't. Here's the specific machinery a paper account skips, and what it does to your read of your own edge.

  4. Why Your Limit Order Didn't Fill

    · execution · order-types · fills

    The price touched your limit. Shares printed there. You got nothing. The answer is queue position, and it's the least understood mechanic in day trading.