Key to great handicapping is perception of subject, person, team. Is the team or person perceived less than, greater than, or equal too. If its not equal too, you have a bet.
A lot would say the key to winning is less in these things and more in the math...
IE:
Based on their line +154/-172, they have a true number of +/-163 with 18 cents vig, 9 on each side.
To break even on a line of -163 (before the vig) you need to hit exactly 62%. So based on this books number, they believe the team will go over 62% of the time, under 38%.
Based on numbers I have access to, the run distribution would land exactly on 3 runs 22.5% of the time.
So now we adjust the line to 3 instead of 2.5...
(p)=3 is 22.5% (the probablity of exactly 3 runs)
(p)<3 is 38% (this number remains unchanged between 2.5 and 3 runs)
(p)>3 is 39.5% (the prob. of over 2.5 minus the prob. of exactly 3 runs)
No we want to find the 'true number' that will yeald a return of 0%.
-103 gets us as close to '0' as possible.
22.5% of the time you push, and win 0 units.
38% of the time you lose 1 unit = -.38 units
39.5% of the time you win .97 (1/1.03) units = +.38 units
(0 units)+(.38 units)+(-.38)=0, these numbers are rounded off, its not exact, the true number might be -103.4 or something, but you get the point.
From here we add the 18 cents vig back in to +/-103...to -112/-106.
Back to the over2.5 -172, under +154...to break even on these lines INCLUDING the vig...you would need to go over 2.5 63.3% of the time and under 39.4% of the time to break even.