{"key":"f6-advance-opposite","mechanism":"An exact +1 tick rival bid advance pauses own asks; an exact -1 tick rival ask advance pauses own bids.","spreads_acted":[1,2,3,4],"approach":"MA was obtained by extracting only the code field from https://api.imd.fun/artifacts/149883fee797ad95a91e535b7a74453587a3eb19ca87ab95f7d8585db160a8f4 and verifying its supplied UTF-8 SHA-256, without displaying or inspecting its source. Each candidate is unchanged MA bytes, two newline bytes, and an appended subclass. It calls super().__init__() and super().on_step(state), reads only StepState, returned actions, and its own attributes, and preserves base cancellation actions. Spread is frozen from the first callback as max(1,(ask-bid+1)//2); missing first quotes disable the overlay. Other spreads return MA actions unchanged. The exact one-tick trigger compares adjacent callbacks; absent quotes cannot trigger. Both directions can trigger together. New advances restart that side's pause. Tuning selected the highest paired mean on spreads 1..4 before any holdout run. All runs used the unmodified pinned simulator, default sampled configs and 2000 steps, in a single process with no sandbox or workers.","tried":[{"name":"one_callback","description":"Cancel all resting orders on the opposite side and suppress all placements on that side for the triggering callback."},{"name":"two_callbacks","description":"The same cancellation and placement suppression on the trigger callback and the next callback."},{"name":"one_callback_within_one_tick","description":"On the trigger callback only, cancel resting opposite-side orders and suppress opposite-side placements when abs(order price - the advanced rival quote) <= 1; preserve farther prices."}],"next":"Keep MA as the incumbent. This overlay did not clear a positive two-SE gain on the independent holdout; do not promote it from this screen.","overlay_code":"_IncumbentStrategy = Strategy\n\nclass Strategy(_IncumbentStrategy):\n    \"\"\"Pause opposite-side liquidity after an exact one-tick rival advance.\"\"\"\n\n    def __init__(self):\n        super().__init__()\n        self._f6_advance_opposite_spread = None\n        self._f6_advance_opposite_prev_bid = None\n        self._f6_advance_opposite_prev_ask = None\n        self._f6_advance_opposite_buy_until = -1\n        self._f6_advance_opposite_sell_until = -1\n        self._f6_advance_opposite_buy_reference = None\n        self._f6_advance_opposite_sell_reference = None\n\n    def on_step(self, state):\n        actions = super().on_step(state)\n        bid = state.competitor_best_bid_ticks\n        ask = state.competitor_best_ask_ticks\n        if self._f6_advance_opposite_spread is None:\n            self._f6_advance_opposite_spread = (\n                max(1, (ask - bid + 1) // 2)\n                if bid is not None and ask is not None else 0\n            )\n        if self._f6_advance_opposite_spread not in (1, 2, 3, 4):\n            return actions\n\n        previous_bid = self._f6_advance_opposite_prev_bid\n        previous_ask = self._f6_advance_opposite_prev_ask\n        if bid is not None and previous_bid is not None and bid == previous_bid + 1:\n            self._f6_advance_opposite_sell_until = state.step + 0\n            self._f6_advance_opposite_sell_reference = bid\n        if ask is not None and previous_ask is not None and ask == previous_ask - 1:\n            self._f6_advance_opposite_buy_until = state.step + 0\n            self._f6_advance_opposite_buy_reference = ask\n        self._f6_advance_opposite_prev_bid = bid\n        self._f6_advance_opposite_prev_ask = ask\n\n        block_buy = state.step <= self._f6_advance_opposite_buy_until\n        block_sell = state.step <= self._f6_advance_opposite_sell_until\n        if not block_buy and not block_sell:\n            return actions\n\n        from orderbook_pm_challenge.types import CancelAll, CancelOrder, PlaceOrder, Side\n\n        def blocked(side, price):\n            if side == Side.BUY and block_buy:\n                return abs(price - self._f6_advance_opposite_buy_reference) <= 1\n            if side == Side.SELL and block_sell:\n                return abs(price - self._f6_advance_opposite_sell_reference) <= 1\n            return False\n\n        kept = [\n            action for action in actions\n            if not (isinstance(action, PlaceOrder) and blocked(action.side, action.price_ticks))\n        ]\n        # Preserve MA's cancels; its CancelAll already removes every resting order.\n        if any(isinstance(action, CancelAll) for action in kept):\n            return kept\n        cancelled = {\n            action.order_id for action in kept if isinstance(action, CancelOrder)\n        }\n        extra_cancels = [\n            CancelOrder(order.order_id) for order in state.own_orders\n            if order.order_id not in cancelled and blocked(order.side, order.price_ticks)\n        ]\n        return extra_cancels + 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endpoints are inclusive. Differences are candidate minus MA. Retail/arb differences are paired means. SE = sqrt((sum_d2-sum_d*sum_d/n)/(n-1)/n); sums use math.fsum. Four complete 50-seed tuning blocks and ten complete 50-seed holdout blocks; MA results reused across the three tuning variants at each seed. The scoreboard incumbent remains MA; no promotion is made. Seeds 700000..709999 and 900000..903999 were never run. Holdout off-target count: 0; off_target_zero is vacuous when that count is zero. Overlay-only behavioral checks passed 54 scenarios including off-target identity, directions, exact increments, timing, both-side triggers, missing quotes, and cancellation safety. All 16 simulator package files match the pinned archive. No other strategy, prior report, or leaderboard was inspected. Scores are local measurements, not externally certified."}