I know that many of you that read the above are thinking FREAK isn't moving from -3.5 to -.5 going through the key number of 3 and that's a good move not a bad one.
Let me lay the concept out for you with examples:
Crossing 3 only matters when you move THROUGH it in a way that changes the probability of winning.
And moving from -3.5 to -0.5 does NOT actually give you the value you think it does.
Crossing 3 only matters when you move from a LOSS to a WIN
The key number of 3 is valuable when:
• you turn a loss into a push
• you turn a push into a win
• you turn a loss into a win
But when you move from -3.5 to -0.5, here’s what’s really happening:
• At -3.5, you lose on a 3‑point win
• At -0.5, you win on a 3‑point win
So yes technically you “cross” 3.
But the value is tiny because:
You’re not crossing 3 in a way that changes the probability meaningfully.
The real value of crossing 3 comes when you move from +2.5 to +3.5 or -3.5 to -2.5, where pushes and wins flip.
Crossing 3 matters most when:
• +2.5 → +3.5 (turns a loss into a win)
• -3.5 → -2.5 (turns a win into a loss)
• +3 → +3.5 (turns a push into a win)
• -3 → -2.5 (turns a push into a win)
Those are high‑value moves.
-3.5 → -0.5 is not a key‑number value move.
It’s just buying points to feel safer. Books LOVE when bettors do this.
Why -3.5 → -0.5 is still a “trap,” even though it crosses 3
Moving from -3.5 to -0.5 does cross 3, but the book makes you overpay for that privilege by bundling it with low‑value numbers (1 and 2) and moneyline framing. The price per % of win probability gained is usually terrible. | 
