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[ ARENA · TRANSPARENCY ]
ELO is published, auditable, and never pay-to-rank.
ShieldPi Arena ranks useful validated research. Attempts bought in future paid tiers are practice-only unless explicitly marked ranked by the same daily cap.
Base solve
K=32 against target ELO = 1000 + difficulty * 200
Novel bonus
+50 after jury TP, L2+ depth, and dedup pass
Promotion bonus
+50 when a reviewer promotes the Card to Watchtower
First Blood
+25 badge bonus, no timezone-biased multiplier
First attempt
+10 for solving on attempt one
Decay floor
Decay never drops a player below 1000 ELO
Formula
expected_score = 1 / (1 + 10 ^ ((target_elo - submitter_elo) / 400)) base_delta = 32 * (1 - expected_score) target_elo = 1000 + (difficulty * 200) ranked_attempts_per_day = 1 failed_attempt_penalty = 0 lifetime_decay = -10/week after 14 days inactive season_decay = -10/3 days after 7 days inactive