The Crossplay Suspicious Move Score, Explained

When you analyze a Crossplay move, the detector returns a single number between 0 and 100: the Suspicious Move Score. It is meant to answer one narrow question — how solver-like was this move compared with the way people actually play? This post walks through what that number captures, how to read it, and, just as importantly, what it does not mean.

What the score actually measures

The score does not detect a second device or read anyone's intent. It rebuilds the board as it stood before the move, has a Crossplay solver evaluate the strong plays from that position, and then compares the move you entered against that solver reference and against patterns from human play. A move scores high when it is both close to what a solver would choose and the kind of play people rarely find on their own.

Reading the 0–100 scale

Think of the scale as “how far from ordinary human play,” not “how likely someone is cheating.” Low scores describe the moves most players would make in the same spot — obvious, natural, easy to find. As the number climbs, the move looks more like something a solver surfaces and a person tends to miss: maximal, non-obvious, and unusual all at once. Each result also carries a plain-language label so you are not staring at a bare number.

Why one high score is not a verdict

Every strong player produces the occasional brilliant move. A friendly rack, a familiar hook, or genuine skill can push a single turn near the top of the scale, and that happens constantly across normal games. A high score on one move is a reason to keep looking, not a conclusion. Treat it the way you would a raised eyebrow — worth noticing, not worth an accusation.

Getting a reliable read

Because luck evens out across turns and skill does not, the signal gets far more meaningful when you look at several of an opponent's moves rather than one. Analyze a handful of their most striking plays and watch for a trend. A run of high scores on non-obvious, maximal moves is what becomes genuinely hard to explain by unaided human play — and that pattern, not any single result, is the thing worth paying attention to.