The 0.5 / −0.5 Asian Handicap line eliminates the push outcome — every match settles as either a win or loss. AH −0.5 is functionally identical to backing the favourite in 1X2, but at lower bookmaker margin. AH +0.5 covers both the underdog win and the draw at a single price, often beating the equivalent Double Chance market on margin alone.
Unlike whole-ball handicaps (−1.0, −2.0) which can refund stakes on exact-margin matches, and unlike quarter-ball lines (−0.25, −0.75) which split stakes, the half-ball line settles cleanly on every scoreline. This makes it the ideal entry point for understanding Asian Handicap pricing and the cleanest line for direct EV comparison against equivalent 1X2 and Double Chance markets.
| Line | Scoreline | Settlement | Commentary |
|---|---|---|---|
| Favourite −0.5 | Favourite wins by any margin | Win | Identical to 1X2 favourite win. |
| Favourite −0.5 | Match draws | Loss | No push — the half-ball eliminates the refund scenario. |
| Favourite −0.5 | Underdog wins | Loss | No push. |
| Underdog +0.5 | Underdog wins by any margin | Win | Identical to 1X2 underdog win. |
| Underdog +0.5 | Match draws | Win | Key difference vs 1X2: the draw pays out at the bet price. |
| Underdog +0.5 | Favourite wins | Loss | No push. |
Enter both teams' xG into the Poisson calculator. The output gives you P(home win), P(draw), and P(away win). The half-ball handicap derives directly from these three probabilities — no additional model is needed. P(AH −0.5 fav win) = P(favourite wins outright). P(AH +0.5 dog win) = P(underdog wins) + P(draw).
Fair odds = 1 / probability. For the favourite at AH −0.5: fair odds = 1 / P(favourite wins). For the underdog at AH +0.5: fair odds = 1 / (P(underdog wins) + P(draw)). Example: home win 50%, draw 28%, away win 22%. Fair AH home −0.5 = 1 / 0.50 = 2.00. Fair AH away +0.5 = 1 / (0.22 + 0.28) = 2.00. Both sides have identical fair odds in this example because the probabilities split evenly.
Compare fair AH −0.5 against bookmaker AH −0.5. Compare fair AH +0.5 against bookmaker AH +0.5. Then cross-check: bookmaker AH −0.5 should be lower margin than bookmaker 1X2 home/away win — if the AH price is worse than the 1X2 price, the bookmaker is mispricing and you should take 1X2. Cross-check AH +0.5 against Double Chance (1X or X2): both cover the same outcomes; the lower-margin product wins.
Both markets cover similar ground. Compare the implied returns: with £100 stake, AH +0.5 at 2.50 returns £250 on win, £250 on draw, £0 on loss. DNB at 3.00 returns £300 on win, £100 (refund) on draw, £0 on loss. Calculate expected return per £100 staked and pick the higher one. Generally AH +0.5 is preferred when the underdog has higher win probability than draw probability; DNB is preferred when the draw is more likely than the underdog win and you want to protect the stake.
Half-ball handicaps are functionally similar to 1X2 markets — the variance is comparable to backing a single outright outcome. Apply quarter-Kelly: stake = (edge / (odds − 1)) × bankroll × 0.25. The half-ball does not add or remove variance compared to the equivalent 1X2 bet, but the slightly lower bookmaker margin means the half-ball price more often clears the EV threshold for staking.
| Market | Covers | Typical margin | Equivalent to |
|---|---|---|---|
| Favourite outright (1X2) | Favourite wins | 5–8% | AH −0.5 favourite |
| AH −0.5 favourite | Favourite wins (no draw cover) | 2–4% | 1X2 favourite — but lower margin |
| Underdog outright (1X2) | Underdog wins only | 5–8% | AH +0.0 (DNB) excluding draw refund |
| AH +0.5 underdog | Underdog wins or draws | 2–4% | Double Chance X2 — but lower margin |
| Draw No Bet (DNB) underdog | Underdog wins, draw refunded | 4–6% | AH 0.0 — same product, sometimes different name |
| Double Chance (1X or X2) | Two of three outcomes | 5–8% | AH +0.5 — but higher margin typically |
Poisson model output: City home win 76%, draw 14%, Sheffield away win 10%. Fair AH −0.5 City = 1 / 0.76 = 1.32. Fair 1X2 City = 1 / 0.76 = 1.32 (mathematically identical). Fair AH +0.5 Sheffield = 1 / (0.10 + 0.14) = 1 / 0.24 = 4.17. Fair Double Chance X2 Sheffield = 1 / 0.24 = 4.17.
Bookmaker prices: 1X2 City 1.25 (margin pushes price below fair), AH −0.5 City 1.30 (closer to fair). Bookmaker AH +0.5 Sheffield 4.00, Double Chance X2 3.85. Compare: AH −0.5 City beats 1X2 by 4 ticks. AH +0.5 Sheffield beats Double Chance X2. The half-ball is the lower-margin product on both sides.
EV check: (0.76 × 1.30) − 1 = −1.2% (negative — bookmaker still has edge after offering better price). Skip the favourite. (0.24 × 4.00) − 1 = −4% (also negative). Skip the underdog. The half-ball is the best of the available markets, but neither side has positive EV — no bet.
A half-ball handicap is the 0.5 / −0.5 Asian Handicap line. The favourite at −0.5 must win the match outright for the bet to settle as a winner; a draw or away win loses. The underdog at +0.5 wins or draws to settle as a winner; only an outright loss settles the bet as a loser. The half-ball line eliminates the push possibility — there is no scoreline where the bet refunds, because no scoreline ends in a half-goal margin.
The half-ball handicap and Draw No Bet (DNB) settle on different match outcomes. AH +0.5 (underdog half-ball): underdog wins or draws = win, underdog loses = loss. DNB on the underdog: underdog wins = win, draw = stake refund, underdog loses = loss. The functional difference is that AH +0.5 captures the draw as a winning outcome (paid out at the bet odds), while DNB refunds the stake on a draw. AH +0.5 typically offers better odds because it pays a draw rather than refunding it — but only the bookmaker margin determines which is mathematically better in any given fixture.
Use AH +0.5 when you expect the underdog to keep the match competitive — the half-ball line lets you back the underdog without needing them to win outright (a draw also settles as a winner). The half-ball line is particularly valuable when bookmaker draw prices are too short relative to your model, because the half-ball captures both the draw and underdog win outcomes at a single price. Conversely, use AH −0.5 (favourite) when your model gives the favourite a strong outright win probability and the bookmaker is offering the −0.5 line at a price below the equivalent 1X2 market.
AH −0.5 is mathematically identical to backing the favourite in the 1X2 market — both require the favourite to win outright. The only meaningful difference is the bookmaker margin. The Asian Handicap market typically operates with 2–4% margin compared to 5–8% on 1X2, so AH −0.5 should consistently offer slightly better odds than the equivalent 1X2 home/away win price. Always compare the two before placing a bet on the favourite.
Use the Poisson calculator to derive 1X2 probabilities — half-ball fair prices follow directly without additional modelling work.
