Delta Defender

Write the hedging rule. We'll run it for you.

You're short one call. Instead of dragging a slider, you write a hedgeRatio(S, K, T, r, sigma, tick) function. Every run, we pick a fresh strike, expiry, and volatility, generate a real GBM price path, and call your function at every one of 40 ticks - then the needle plays back exactly how well your formula tracked true Delta the whole way through.

Interview lens: this is the actual question - "write me a delta-hedging rule" - not a guessing game about one. A formula that only works for one strike or one expiry will get caught out on the next run.