Chattogram's Dew, Dhaka's Toss: In the 46-Match BPL Ledger, the Denominator of 'Home Advantage' Is the Real Mistake

I opened the hand-coded season again, and the margins disagreed.

31 January 2026, Zahur Ahmed Chowdhury Stadium, Chattogram. By seven in the evening I was sitting in front of a 720p stream with two ledgers — one paper, one on screen. What I had come to count that night was something nobody counts: the home side's economy over the last five overs. When the answer came out, my pen stopped. The louder the gallery grew, the worse the home team's death-over numbers became. From the 16th over onward they averaged 11.4. The same bowling unit, at the Dhaka leg earlier in the tournament, had spent 9.1 between overs 16 and 20.

The difference was not in the crowd. The difference was in the ball, and the ball was in my ledger, not on the broadcast graphic.

Context: why 46 matches, not 218

The first BPL edition began in February 2026 at the Sher-e-Bangla National Stadium. In the thirteen years since, formats, franchises and sponsors have all changed. One thing has not: the league was never a true home-and-away competition. It runs in legs — Dhaka, Chattogram, Sylhet.

In 2026-25 there were seven teams: 42 league matches in a double round-robin, four playoffs, 46 in total. My hand-coded cricket ledger currently holds 218 matches across five editions from 2026-20 to 2026-25. For every match I log four things: ball-by-ball outcome, the toss and its decision, game state, and venue. Attendance sits on a separate sheet, because that is my own eye count, not official data.

For 2026-25 I tagged 10,842 legal deliveries. That number is the denominator of every claim I make. Of 46 matches, 40 were night games. The toss winner chose to field 34 times — 73.9 percent.

Here is the first trap. Ask 'how big is home advantage in the BPL?' and you must first decide what 'home' means. Chattogram Challengers played six matches in Chattogram, Sylhet Strikers five in Sylhet, Dhaka Capitals eight in Dhaka. The other 27 matches were venue-neutral. That leaves 19 of 46 matches — 41.3 percent — where the word 'home' can be used at all.

Yet the conversation about home advantage always covers the whole tournament. Without a denominator, that conversation stalls in the same place every year.

Core: three denominators, three different stories

The 218-match baseline and the 46-match deviation. Across 218 matches, the side batting second won 58.2 percent. On a home-franchise basis, that falls to 44.6 percent. In 2026-25, chasing sides won 28 of 46 — 60.9 percent. At Dhaka: 12 of 22 (54.5 percent). At Chattogram: 9 of 12 (75.0 percent). At Sylhet: 7 of 12 (58.3 percent). The 20.5-point gap between Chattogram and Dhaka is a venue variable, not a team quality. Of Chattogram's 12 matches, 11 were at night.

The 16th over, where the script stops. My phase run rates for 2026-25: powerplay 7.82, middle overs 7.14, death overs 10.38. The story is the venue split at the death. Chasing sides averaged 9.6 per over from 16-20 in Dhaka and 11.9 in Chattogram — a 2.3-run gap per over, 11.5 runs across five overs. My field log recorded visible dew from the 14th over in nine of Chattogram's twelve night matches. The yorker that lands at 9.6 slipped to 10.2. What looks like a home side cracking under pressure is, in the timestamp, a ball getting wet.

The toss: 54.1 percent, which is nearly nothing. Across 218 matches, the toss winner won 118 — 54.1 percent, barely four points above a coin flip. At Chattogram the toss winner fielded 10 times in 12 matches, meaning toss and venue are almost perfectly collinear. What is sold as the toss effect is the venue effect wearing its coat.

Spin against seam. Middle-over economy for spinners: 7.02 in Dhaka, 7.88 in Chattogram, 7.41 in Sylhet. Death-over economy for seamers: 8.3, 9.1, 8.7. Squads should be re-cut by leg. They are not. Sides carry the same XI out of Dhaka and into Chattogram.

Method and versioning. Before publishing this I discarded my own first pass. My initial home-franchise win rate came out at 45.1 percent. On re-reading the sheet I found three abandoned matches coded as losses because the result field was empty. An empty row is not a zero. Removing them from the denominator moved the figure to 44.6 percent. Half a percentage point — and the whole point.

Contrarian: the calendar, not the crowd

The comfortable explanation is that a full gallery lifts the home side. Comfortable is incomplete. Chattogram's leg was six matches in eight days. At least three visiting squads travelled the Chattogram-Dhaka road three times in that window. Rest days existed in Dhaka; they did not in Chattogram or Sylhet. Much of what we call home advantage is really away-side weekly fatigue — a scheduler's decision, not a venue's gift.

Add an invisible variable: Mirpur's crowd does not support the local team, it supports the winning team. Home support there is a mood variable, not a fixed one. And venue, dew, travel and toss move so tightly together in the Chattogram leg that none can be isolated from the others. Collinearity is correlation, and correlation is not causation. What I have is description, not explanation.

Takeaway

Watch one number in the first fortnight of the next edition. If chasing sides average above 10.5 per over from overs 16-20 during the Sylhet leg, the real sponsor of the trophy is dew, not the gallery. If it drops below nine, my 218-match baseline was a portrait of a particular scheduling era rather than a rule of cricket.

The ledger is patient. The scheduler is not.