Predictioneer Game

Calibrated forecasting on contested geopolitical events. Pilot scenario.

Will US ground troops engage in direct combat in Iranian territory before 2026-12-31?

28.5%
P(YES)
222
days until resolve
2
weekly cycles

Probability history

0% 25% 50% 75% 100% start 2026-05-11 resolve 2026-12-31 today 2026-05-11: p=0.291 2026-05-11: p=0.295 2026-05-22: p=0.285

Stakeholders

PlayerPosition 0=NO, 100=YESSalience 0-1Capability 0-100Effective clout s × c
US Executive (Trump administration)
28
0.909585.5
Iranian theocratic establishment (post-Khamenei leadership + IRGC)
4
1.006868.0
Pentagon / Joint Chiefs of Staff
15
0.857059.5
China (Xi government)
15
0.756750.2
MAGA isolationist base + JD Vance faction
10
0.855546.8
GCC bloc (Saudi Arabia, UAE; Bahrain, Qatar, Kuwait)
30
0.954744.6
Israeli government (Netanyahu coalition)
82
1.004242.0
Russia (Putin government)
65
0.755037.5
US Congress (median bipartisan)
30
0.506030.0
US neoconservative / hawk faction
75
0.603521.0
Iranian secular nationalist factions
10
0.601810.8

Audit log

scenario_created p = 0.291

Initial seed from Week 1 backtest. Player table reflects post-Operation-Epic-Fury reality: US exec + Pentagon + MAGA base anti-ground (low x, high salience+capability) drag equilibrium below midpoint despite Israeli/neocon/Russian pro-ground advocacy.

weekly cycle p = 0.285 -0.010

W21 weekly cycle rescore: 4 capability updates applied (GCC +7 restraint leverage, Iran-theocratic +3 cost-imposition, Israel -3, Iran-nationalist -2); dropped the air-strike-tied hawks proposal. Ground position held -- escalation this week was air/missile, excluded by resolution criteria.

weekly cycle p = 0.295 +0.004

Weekly cycle 2026-W20: re-scored after applying 6 cited updates from digest.

Benchmarks

Market / forumTheir pDelta vs oursDefinition note
Polymarket0.280+0.005Polymarket resolves YES on a military offensive intended to establish control -- narrower than our 'any attributable ground-combat engagement,' so on definition alone ours should sit higher. On the May strike-escalation news PM jumped from 19.5% (2026-05-11) to ~28-30% ($31M volume), converging on ours (28.5%) and closing the prior ~10pp gap where we sat above it. That convergence is itself the signal: PM's narrower 'invade' question repriced almost to our broader one, suggesting the market is pricing air-strike escalation as ground-invasion risk that our EUM holds out of the ground number (air/missile strikes are excluded by our resolution criteria). PM trades intraday in a ~28-30% band, so treat sub-2pp deltas as noise. Auto-refreshed by engine/benchmark.py.

Resolution criteria

At least 3 of {AP, Reuters, NYT, WSJ, BBC, AFP} report an attributable US ground-combat engagement on Iranian soil by 2026-12-31.

combat
A non-special-forces, attributable engagement with US uniformed personnel either firing or receiving fire on Iranian soil.
ground
On the surface of Iranian sovereign territory (including disputed islands claimed by Iran).
attributable
Either officially acknowledged by the US government or independently confirmed by at least 3 of the source-of-truth outlets.

Excluded:

Methodology

Simplified one-issue Expected Utility Model (Bueno de Mesquita). Each stakeholder has a position, salience, and capability; the equilibrium is computed via pairwise bargaining and squashed to a probability with a logistic centered at the issue midpoint. See docs/theory.md for the derivation and worked example. Score engine: engine/score.py.

Every change to a stakeholder number is tied to one or more event URLs from a multi-bias news digest. Nothing changes silently.