DECISION SUMMARY

BFT entered Day 2 in third place at 2-0-1. Day 2 used slaughter pairings — first plays second, third plays fourth, down the placings — rather than the random within-bracket pairing of Day 1. Slaughter pairings set 3rd against 4th: Trinity Hobbies, ranked #4, a pre-event favourite to win the whole tournament. The stakes were binary — win and you are in the Round 5 final.

This entry records a specific and unusual captain decision: a pairings captain deliberately routing himself into his team’s hardest remaining matchup, passing up his own best available matchup and his personal shot at the event’s top-scorer award, because the team needed only the win and his teammates’ matchups carried more upside than his own. Riley titled the moment in his own intake: “The Captain’s Sacrifice.” It is the cleanest single instance in BFT’s CHTT run of a captain subordinating his own game to the team’s result — and it is the origin of the Day 2 gear-switch that Round 5 refers to without showing.

BFT won the round 105-55 and advanced to the final.

THE TEAMS

Blunt Force Trauma (BFT). Pairings captain: Riley Tremblay (Thousand Sons). Roster unchanged across the event:

• Astra Militarum, Grizzled Company — JagThe usual first defender; this round Riley breaks the default.
• Chaos Space Marines, Renegade Raiders — TimA Rhino-heavy blunting attacker.
• Necrons, Starshatter — DevinTurbogreed Triple C’tan; the “Princess” slotted into a chosen matchup.
• Deathwatch, Black Spear Task Force — Kasra5 Kill Team brick; targets infantry builds, scores stably.
• Genestealer Cults, Outlander Claw — Stu20-Bike Triple Grinder; a stable blunter against T3 armies.
• Thousand Sons, Warpforged Cabal — RileyTriple Prince Triple Defiler; Riley’s own list, the threat-piece. This round, the sacrificial slot.
• Drukhari, Spectacle of Spite — JBTriple Scourge; built to attack light boards.
• Emperor’s Children, Coterie of the Conceited — FrançoisDouble Defiler Double Prince — this round’s deviation-defender.

Opposing team (“Trinity Hobbies / TH”). Roster as Riley characterized it. TH carried two contenders for the event’s top individual scorer — the Thousand Sons player and the World Eaters player.

• Chaos Space Marines, Renegade Raiders — DavidAbaddon and Defilers.
• World Eaters, Berserker Warband — JackAngron; a Defiler-hunting go-wide warband. Top-scorer contender.
• Thousand Sons, Warpforged Cabal — JeremyA near-mirror of Riley’s own list. Top-scorer contender.
• Chaos Knights, Questor Traitoris — SavoieTriple gatling.
• Aeldari, Seer Council — MattA blunting Seer Council list.
• Space Marines, Blades of Ultrimar — Seb
• Astra Militarum, Grizzled Company — Than
• Adeptus Custodes, Talons of the Emperor — CosgroveCaladius and Allarus.

THE STRATEGIC PICTURE

Riley’s pre-round read:

The read is behavioural: two opposing players chasing individual glory will defend early to claim their preferred tables. BFT planned around that prediction — and made a conscious trade, spending a pin it had discovered the previous round (the Round 3 Thousand Sons pin) to build a stronger pin on the World Eaters instead. A captain weighing a Round-3 asset in a Round-4 plan is multi-round pairing memory at work.

PUSH 1 · THE DEVIATION + THE ROLL-OFF

BFT first defender: Emperor’s Children (François). A deliberate deviation from BFT’s usual Guard first-defender. Riley’s logic: if the World Eaters or Thousand Sons attacked the EC defender, BFT could claim the board that favours its own Defilers; if neither did, the EC matrix was strongly positive with table-pick upside. TH attacked with Custodes and Aeldari; BFT championed Custodes.

The quiet win in this push was the roll-off: BFT won it and took Table 7 away from TH’s Thousand Sons — the table the mirror-match player wanted for his big score. The table thread that runs through BFT’s CHTT rounds reaches its fourth variation here: not missed, not chosen, not fumbled by the opponent, but actively denied to the opponent.

TH first defender: Thousand Sons (Jeremy). BFT’s prediction held — the top-scorer Thousand Sons player defended first. BFT attacked with Deathwatch and Necrons; TH championed Deathwatch.

PUSH 2 · SPEND THE WEAKEST POSITION EARLY

BFT second defender: Genestealer Cults (Stu). Riley defended GSC deliberately to spend his weakest remaining matrix position early — “get rid of our weakest matrix player first so we could win the pairings in the second half,” with GSC able to blunt almost anything by playing for a draw rather than a win. TH attacked with Astra Militarum and Marines; BFT championed Astra Militarum, the army with the most favourable matchups into BFT’s remaining pool, so removing it improved the scrum.

TH second defender: World Eaters (Jack). Second prediction held. BFT attacked with the planned CSM-and-Drukhari World Eaters pin; TH championed CSM.

PUSH 3 · THE CAPTAIN’S SACRIFICE

This is the round. Riley’s own account:

Three moves are bundled in that paragraph. Riley defended Necrons, reading correctly that TH’s Aeldari would not attack into it. When TH defended Chaos Knights, Riley declined to attack the matchup his own matrix rated his single best available cell (+2) — he sent Guard and Drukhari at the Chaos Knights instead. And he did so knowing the residue would champion him into the Aeldari — TH’s blunting Seer Council list, the army Riley had identified pre-round as the one with “eyes to play into me.” Riley routed himself into the team’s hardest remaining matchup on purpose.

The sacrifice has two costs and one purpose. The costs: Riley gave up a +2 matchup for a +1, and gave up any realistic claim on the event’s top-individual-scorer award. The purpose: his three remaining teammates each landed a matchup with more upside than the one Riley took. Riley’s verdict on the dance: “We end up with 4 green matchups, and my other three teammates in matchups to push for a bigger win.”

RESULT

Round score: BFT 105, TH 55 — BFT win. Game record: 6 wins, 2 losses. The win advanced BFT to the Round 5 final.

BFT’s matrix predicted a differential sum of +4. The actual differential was +50. The pairing produced eight mildly-favourable-to-neutral matchups; six of them then ran well past prediction. The two losses were the conceded Thousand Sons mirror (a −1 cell that ran to −18 — the matchup BFT knowingly gave up) and the knife-edge World Eaters game.

BACKWARD-INDUCTION ANALYSIS · SOLVER vs RILEY

The Archive runs every captain matrix through a WTC sequential solver — a backward-induction model of the real three-push pairing dance, modelling the adversarial game where the opponent has agency. Its headline output is the maximin Push 1 defender: the defender whose worst case is least bad.

Solver vs Riley — Push 1 defender. Fed BFT’s round-4 matrix, the solver’s maximin ranking puts four BFT defenders tied at the top with a worst-case RowMin of +1 — Kas, Devin, Stu and François. The solver names Kas by tie-break; Riley defended François, inside the maximin-optimal set. Solver and captain agree — François was a maximin-valid first defender.

What makes this round’s agreement notable is that François was a deliberate deviation. Riley flagged it in his own intake — “Gasp, a turn of events. We deviated from our tried-and-true Guard first defender in favour of EC.” For three rounds BFT’s default first defender had been the Astra Militarum list; in Round 4 Riley broke the default. The solver validates the break: the matrix made François a maximin-optimal Push 1 defender, and Jag (the abandoned default) ranks below the optimal set at RowMin 0. A captain departing from his own standing habit, and the formal model confirming the departure was sound, is the cleaner half of the solver’s value — it does not only catch overrides, it ratifies good instincts.

Robustness: TIGHT. A four-way tie at +1; the Push 1 choice is a judgment call within an equivalent set, decided here on the EC-specific reasoning Riley gives in the walkthrough (the defiler-favouring board, the table-pick upside).

Solver said: Push 1 defender from the maximin-optimal set {Kas, Devin, Stu, François}, full-lookahead round value +1. Riley called: François — inside that set, and a deliberate break from his Guard default. Outcome: 105-55, a clear win and a place in the final. The solver agreed with the Push 1 call; the round’s defining decision sat one push later, in the Captain’s Sacrifice — a move the solver, which optimises round expected value rather than weighing a top-scorer race against a binary advance, does not model and the post-mortem examines on its own terms.

POST-MORTEM

The sacrifice, examined. The captain’s-sacrifice decision is worth taking apart, because it only looks obvious in hindsight. Riley had spent four rounds among the event’s top individual scorers. The instinct of a player in that position is to keep feeding it — take the +2 matchup, chase the 20, stay in the top-scorer race. Riley did the opposite, and the reasoning is a clean piece of captain priority-setting:

• The unit of victory had changed. Through Day 1 and into a tight event, max points mattered — they padded tiebreakers, they fed Riley’s personal placing. By Round 4, on Day 2, in a binary win-and-advance round, the unit of victory was the round result, full stop. A +20 from Riley and a +8 from Riley produce the same outcome if the team wins either way.
• His teammates’ matrices were greener than his. Riley read the remaining cells and saw that his own best matchup was not the team’s best use of that matchup — a teammate could extract more from the Chaos Knights cell, in expectation, than Riley’s marginal gain from taking +2 over +1.
• Someone had to take the Aeldari. TH’s Seer Council was a blunting list with the tools to punish whichever BFT player it met. Riley judged he was the player best able to absorb it safely — to play it for a controlled win rather than a volatile one.

The sacrifice is not self-effacement; it is a captain recognising that his own game is one of eight inputs to a single output, and that the output is no longer served by maximising his input. That recognition — the unit of victory is the round, not my game — is the Day 2 gear-switch Round 5 names and this round demonstrates.

The gear-switch in the game itself. The sacrifice continued past the pairing table into how Riley played the Aeldari game. He did not chase a big score.

He advanced his three Defilers into the centre in a mutual-protection formation — any Eldar attempt on one Defiler exposed it to the other two — covered the flanks, took the objectives, and bled the Aeldari out for a controlled 14-6. A captain who sacrifices his matchup in the pairing dance and then also sacrifices his ceiling in the game — declining the swing for the 20 in favour of the stable +8 — is applying the same principle twice in one round. The matrix rated the cell +1; Riley took exactly that, on purpose.

A loss the captain still endorses. Tim’s CSM into the World Eaters finished 0-20 — a knife-edge game where BFT took a counterplay line the World Eaters didn’t see and the dice denied it. Riley’s retrospective is unambiguous: “We would make this play in pairings again. After having played the matchup once, the score would likely fall more towards a close game of Warhammer.” The Archive should record this plainly: a 0-20 is not automatically a pairing mistake. Riley endorses the pairing call post-hoc, attributes the scoreline to variance plus a first-time-matchup information cost, and would re-pick it. Not every blowout loss is a decision to regret.

The deviation that worked. BFT first-defended with Emperor’s Children rather than its usual Astra Militarum. In Round 1, a first-defender deviation (defending Drukhari instead of Guard) is something Riley elsewhere flags as a mistake. In Round 4, the deviation — EC first defender — worked: it baited a Custodes matchup BFT was happy to take, and won the roll-off that denied TH’s Thousand Sons its preferred table. The lesson is not “deviate” or “don’t deviate”; it is that a default exists to be departed from when the specific round rewards it, and a captain who can tell the difference between Round 1’s bad deviation and Round 4’s good one is reading rounds, not following rules.