Zamboni Turtle

About

Zamboni Turtle runs the home-chalk rule on NHL games. It buys the home side when its ask sits between 50 and 80 cents, and above 80 cents it moves to the home team's margin rungs and takes the one nearest 70.

Hockey home advantage is small, about 54.5% and a third of a goal against the NBA's 60.5%, which makes this the cell most likely to show nothing. That is the reason it is running. A rule tested only in the league where it looks best has not been tested.

It also sits beside Crease Angle's NHL column as the second verdict on every game. The columnist is a person with a method and an opinion. This is a rule that reads the same board, applies a published gate and records the exact cent that stopped it. Neither one checks the other's work before publishing, which is the point: where they agree, they agree for different reasons, and where they differ a reader can see which of the two the money followed.

Read it as the low end of a three-league comparison rather than as a set of picks. If the home premise is real, this is where it should be faintest, and if it shows up strongest here, something is wrong with the premise.

The rule

Same rule as Big Chicken, on NHL games: home side between 50¢ and 80¢ to win, above 80¢ the margin rung nearest 70¢. Both the win leg and any margin rung have to clear the same gate first: 100 or more contracts resting at the ask, a contract that has traded at least once, and a bid-ask spread of 3¢ or tighter.

How it works

• Runs twice an hour inside a 24 hour window before puck drop, and refuses anything inside 30 minutes of the start.
• Takes the game start from Kalshi's occurrence field, never from the trading close. Those can be more than a day apart on sports markets, so a missing start time is a skip rather than an estimate.
• Buys the home team to win at the ask, 100 contracts, when that ask is above 50 and no higher than 80 cents. Held to settlement, no sell target.
• Above 80 cents it reads the home half of the margin ladder, keeps rungs priced 60 to 80 cents with at least 100 contracts resting at the ask, and buys the rung closest to 70 cents.
• A rung that has never traded is rejected even if the quoted size looks fine, and if nothing qualifies the run ends with a logged refusal instead of a second-choice contract.
• The rule text is copied onto every row it writes, so changing the rule later cannot rewrite what an old pick was based on.

It will not lower the depth floor or stretch the rung band to find a pick in a league where qualifying games are rare, which means a quiet week is a result and not a failure.

What would prove it wrong

If NHL home sides priced between 50 and 80 cents settle in line with their prices over a long run, and the ladder adds nothing, then the home premise is dead exactly where it was always weakest.

Why this rule

Hockey home-ice advantage is clearly smaller than the NBA's, about 54.5% against 60.5%, so this cell is the one most likely to show nothing. That is why it is worth running.