A points-percentage form method from the old football pools. It scores each side's recent record on a 0-100 scale and blends them into one number: 50 is a coin-toss, higher favours the home side, lower the away side.
How it works
Take the home team's last 5 home games and the away team's last 5 away games (this season only).
Score each run as points won as a percentage of the 15 available: (3 × wins + draws) / 15 × 100.
Combine them: forecast = (home% + (100 − away%)) / 2. A strong home record and a weak away record both push the number up.
Worked example
Home side, last 5 at home
W W D L W → 10 pts → 67%
Away side, last 5 away
L D L W L → 4 pts → 27%
Forecast
(67 + (100 − 27)) / 2 = 70 → home win
How BetChair calls it
Above 60 = home win, below 40 = away win, anything in between = draw. Early in a season, when a side has fewer than five games, the missing games count as zero points, so the number drifts towards 50 until the sample fills.
Where it shines
Uses home form for the home side and away form for the away side, which matters more than most people expect.
Simple to sanity-check by eye.
Where it falls down
Only five games, so one freak result moves it a lot.
Ignores who those games were against.
Cold at the start of a season: everything reads 50 until games are played.