What is a steam move in esports betting?
Short answer
A steam move is a sudden, fast change in a match's odds that shows up at several bookmakers within a short time. The word comes from the idea of a market 'gathering steam': many sources of money pushing the same line in the same direction.
Why it happens
Sharper bookmakers and large bettors tend to move a line first. Other bookmakers copy the new price within minutes so they are not left offering a stale number. What you see from outside is one price falling quickly while others follow.
In esports this is often visible before the maps or picks are known, after a roster change, or when late information reaches the market.
How it differs from normal drift
Odds drift slowly all the time as money arrives. A steam move is distinguished by speed and by agreement: a large change in a short window, seen across more than one bookmaker. A single bookmaker changing alone is usually just that bookmaker adjusting its own risk.
What a steam move is not
It is not a prediction. The market can be right or wrong, and a team whose odds fell can still lose. A steam move is information about where money moved, not a promise about who wins.
That is why OddsAlert reports movements as market data and keeps a record of how past signals resolved, instead of calling winners.
How to track it
Doing this by hand means keeping many bookmaker pages open and noticing a change before the others follow. An odds-monitoring tool compares the same match across bookmakers and alerts you when a move crosses a threshold.