Your idea: # Delta-Parity Strangle Strategy — Detailed Framework *Nifty spot ref…

# Delta-Parity Strangle Strategy — Detailed Framework *Nifty spot reference: ~24,300 (Aug 14, 2026). Strike interval: 50. All premiums below are illustrative for structure only — pull live LTPs from your chain before entry.* --- ## 1. Core Concept Run three theoretical short strangles side by side. Don't necessarily trade all three — use their **relative premium behavior** as your entry/exit trigger for whichever one matches your market read. | Strangle | Construction Logic | Net Delta | |---|---|---| | **Neutral** | Equidistant strikes | ~0.00 | | **+ve Delta** | Put sold closer to spot, Call sold further OTM | +0.10 to +0.20 | | **-ve Delta** | Call sold closer to spot, Put sold further OTM | −0.10 to −0.20 | --- ## 2. Example Strike Grid (Spot = 24,300) | Strangle | Call Leg (Sell) | Call Δ | Put Leg (Sell) | Put Δ | Net Δ | |---|---|---|---|---|---| | Neutral | 24,500 CE | −0.20 | 24,100 PE | +0.20 | **0.00** | | +ve Delta | 24,550 CE | −0.15 | 24,200 PE | +0.30 | **+0.15** | | -ve Delta | 24,400 CE | −0.30 | 24,050 PE | +0.15 | **−0.15** | Deltas are approximate — pull actual chain deltas at entry since IV skew shifts strike-to-delta mapping day to day. --- ## 3. Entry Signal — Premium Weakness Parity **Definition:** Track each strangle's combined premium (Call LTP + Put LTP) as **% decay from the day's reference premium** (e.g., 9:20 AM value, post opening-range settle). | Strangle | Ref. Premium (9:20) | Current Premium | % Decay | |---|---|---|---| | Neutral | ₹210 (₹110 CE + ₹100 PE) | ₹185 | −11.9% | | +ve Delta | ₹225 | ₹196 | −12.9% | | -ve Delta | ₹230 | ₹202 | −12.2% | **Parity check:** spread between the three % decay figures. Example above: 11.9% / 12.2% / 12.9% → spread = **1.0%**. - **Entry trigger:** spread compresses inside your defined band (start with ≤2%, backtest to tighten). This means all three skews are decaying at a near-identical rate — no directional bias is being priced yet, which is the cleanest theta-entry condition. - **Which one to trade:** once parity confirms, pick the strangle matching your regime read (trend/PCR/VIX) — parity tells you *when*, not *which*. If no directional read, default to Neutral (best win-rate profile of the three in pure range conditions). --- ## 4. Exit Signal — Premium Strength Parity Same spread calculation, but on the **rebound** — premiums rising off session lows. | Strangle | Session Low Premium | Current Premium | % Rebound | |---|---|---|---| | Neutral | ₹185 | ₹204 | +10.3% | | +ve Delta | ₹196 | ₹213 | +8.7% | | -ve Delta | ₹202 | ₹219 | +8.4% | **Exit trigger:** when rebound % across all three re-converges within your band. This says strength is now symmetric again — whatever directional tilt you were riding (if you took +ve or -ve delta) has faded, so the position's edge over a plain neutral strangle is gone. Close here rather than waiting for a full reversal. --- ## 5. Stop-Loss & Trailing SL Keep these **separate** from the parity signal — parity governs timing, SL governs risk. | Type | Basis | Example Rule | |---|---|---| | **Hard SL** | % of net credit received | Exit if net premium (M2M) rises 35–40% above entry credit | | **Trailing SL** | Locks in decay gained | Once premium decays 25% from entry, trail SL to breakeven; every further 10% decay, trail SL up by half that amount | | **Delta breach SL** | Structural | If short strike delta breaches 0.40 intraday (either leg), exit that leg regardless of premium P&L — this is a market-structure signal, not just a price one | Worked example (Neutral strangle, ₹210 entry credit): - Hard SL: exit if combined premium > ₹284 (35% loss) - Trailing SL activates at ₹157 (25% decay) → SL trails to ₹210 (breakeven) - At ₹126 (40% decay) → SL trails to ₹168 --- ## 6. Open Items to Backtest Before Live Sizing 1. **Parity band width** — 1–2% may be too tight for weekly-expiry Nifty on normal-vol days; test 1%, 2%, 3% bands separately for entry frequency vs quality. 2. **Reference premium