{"key":"cancel-f1","idea":"d-s23-retreat-cancel: cancel the side the rival just retreated from, spreads 2 and 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00484,2,5.26908],[900485,1,0.0],[900486,3,1.864755],[900487,3,1.783234],[900488,4,0.0],[900489,1,0.0],[900490,4,0.0],[900491,1,0.0],[900492,2,1.117753],[900493,2,1.026827],[900494,1,0.0],[900495,2,-0.059832],[900496,1,0.0],[900497,3,-0.563204],[900498,3,0.340501],[900499,4,0.0]],"notes":"Both hashes verified by script before running. Check values matched exactly. All 1000 sims ran, no failures, one record per seed and strategy. Spread confirmed on every seed: first rival quotes (step 0) had ask minus bid = 2s-1. d is exactly 0 on all spreads 1 and 4 seeds, since the candidate only acts on spreads 2 and 3. The gain is arbitrage (+0.66) less retail (-0.20). One 500-seed block only; no promotion decision made here. Strategy loaded afresh per run; a pass-through wrapper recorded the rival quotes. Up to 4 chunks ran in parallel, each single-process."}