E · Optimization & Practice · §18
What to record so a loss becomes a diagnosis, with the engine-specific fields this deck actually needs.
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From the guide . §18 Testing Framework
Match results will not tell you whether the deck or the pilot is the problem. These fields will, and three of them are specific to this engine.
Opposing Legend and Chosen Champion, play or draw, the battlefield each player selected, and whether it was a pre-board or post-board game.
The structure, using the categories in §6, and whether it held a two-Energy body. Given that just under half of all openers do not, this field will tell you quickly whether your mulligan rule is right.
Cards played from outside the hand, how many Assault 2 activations actually changed a combat, and how many were spent on combats already decided.
Turns blocked by Power rather than Energy, reactions given up by sequencing, whether a was left untapped, and whether the board was too concentrated on one battlefield.
Outside-hand enabler count after boarding, dead sideboard cards drawn, and whether any Order card was stranded by Power.
One primary cause per loss: pilot error, sequencing, role assignment, sideboard weakness, main-deck construction, matchup structure, or variance. Role assignment deserves its own category here because this deck invites the wrong one.