Batch cycle-001. Model 0.1.0, graph 0.2.0, parameters 0.1.0. 100 simulations, seeds 1 to 100; probes on 20. Every figure is a distribution over simulations of a structural model with seed parameter values; it shows what the model implies under these settings, not what will happen. Other nations are frozen at their 2026 ratings. No reconstructed historical data is used in this experiment.
Headline
South Korea played 20 rounds from 2026 under the mirror a peer method, with stochastic events, 100 times. Its capability index moved from 16.00 to a median of 17.20 (+1.20), with 90 per cent of simulations between 16.47 and 17.73 [experiment_objectives].
Starting position
In 2026 the nation ranks 6 on the index against the frozen field, holds 2 of nine domains at Tier 1 and has a tier rank of 7. Its base income is 888 credits a year, calibrated so that its 2026 position is affordable with headroom for investment.
What was decided
A simulation spent a median of 2,943 credits on moves. The five groups that took most were Nuclear Deterrence (partner, 741 credits, 25.7 per cent); Resource Infrastructure (buy, 144 credits, 5.0 per cent); Space Operations (buy, 129 credits, 4.5 per cent); Quantum Technologies (partner, 108 credits, 3.7 per cent); Space Technologies (partner, 104 credits, 3.6 per cent) [experiment_decisions_by_group]. By mode: partner 47 per cent, buy 41 per cent, build 12 per cent [experiment_decisions_by_group]. Concentration of spending (HHI) had a median of 0.084, and the most repeated action appeared in 95 per cent of rounds.
The leading domain by period: rounds 1 to 5, National Security; rounds 6 to 10, National Security; rounds 11 to 15, National Security; rounds 16 to 20, National Security [experiment_spend_by_period].
The method's chosen action was within 5 per cent of its best alternative in 64 per cent of moves and ahead by more than 25 per cent in 25 per cent [experiment_decision_margins].
What the world did
A median simulation saw 2 shocks and 1 upside events. The most damaging per firing were S03 (33 firings in 31 simulations, −28.9 points each); S07 (13 firings in 13 simulations, −26.9 points each); S01 (26 firings in 22 simulations, −24.4 points each) [experiment_shocks]. Upside events fired 143 times across all simulations [experiment_shocks].
The groups that lost most to shocks, per simulation: Economic Leverage & Dependence −1.07; Fiscal Capacity & Public Finance −1.07; Trade Facilitation & Logistics −1.07; Information Environment & Strategic Communication −0.99 [experiment_shock_damage_by_group].
The edges that carried most change through the graph, per simulation: Nuclear Deterrence to Alliances & Security Cooperation (+1.92 points); Space Technologies to Space Operations (+0.45 points); Economic Output & Productivity to Fiscal Capacity & Public Finance (+0.20 points) [experiment_propagation_by_edge].
Where it ended
At 2046 the median rank is 2 (5th to 95th percentile 2 to 3), the median count of Tier 1 domains 3 (1 to 7) and the median tier rank 5; the resilient score, the mean score sum over simulations, is 1,256 [experiment_objectives].
Tier 1 probability changed most in: financial strength (0 to 13 per cent of simulations); governance and integrity (0 to 33 per cent of simulations); information and influence (0 to 90 per cent of simulations); production and innovation (100 to 49 per cent of simulations); strategic infrastructure (0 to 41 per cent of simulations) [experiment_tiers_by_round].
Why
Without shocks the index ends +0.508 higher on average, so the shocks cost about 0.508 index points [experiment_probe_attribution].
Holding instead of following this method changes the index by −1.657: that is the method's worth against doing nothing [experiment_probe_attribution].
Removing any single one of the five largest actions changes the index by between −0.014 and 0.000, for example 2039 partner Nuclear Deterrence (46 credits) [experiment_probe_attribution]. The largest actions by credits come late, when income is highest, and are rarely the most valuable.
Removing the largest shock of a simulation raises the index by +0.260 on average [experiment_probe_attribution].
The replay probe reproduces the simulations exactly (index change 0.000000), so the attributions are clean [experiment_probe_attribution].
Surprises
tier_jump (warn): largest gain in one domain within five years: 4 tiers (36 simulations above 2).
saturation_high (warn): 76% of simulations end with a group at 20 that did not start there (median 1 groups).
same_action (warn): the most repeated move (group and mode) appears in a median 95% of rounds.
retired_words (warn): e3-kor-mirror-peer/report.md: 'simulations' 2 time(s), first near line 40; use 'simulations'.
The simulation furthest from the median (seed 96) ends −1.21 from it, with 4 shocks and 0 upside events [experiment_outlier_simulations].
Comparison
Against the hold experiment for the same nation (e3-kor-hold), the median index is +1.49 points apart, the median rank 2 against 6, and Tier 1 domains 3 against 1 [experiment_against_hold].
No backcast comparison: this experiment does not start from a historical position [experiment_against_history].