The Strategy Builder and the Payoff Diagram

Picture a single chart that answers the only question that matters before you place a trade. If RELIANCE finishes up here, or flat there, or far down at the bottom, what do you actually make or lose? That one chart is the payoff diagram, and learning to read it is the real skill behind every named strategy in this course. A strategy is nothing more than a set of option legs stacked together, and its payoff diagram is the honest portrait of how that stack behaves. Master the picture and the fancy names stop mattering. You will be able to look at any combination and say, in seconds, where it earns, where it bleeds, and how much is on the line.

A payoff diagram is a picture of your money

Every payoff diagram in this course uses the same two axes, so once you read one you can read them all.

• The horizontal axis is the price of the underlying at expiry. For us that underlying is RELIANCE, which closed near Rs 1,318 on 25 June 2026. Every payoff in this course is drawn for the 28 July 2026 monthly expiry, which on the NSE is the last Tuesday of the month. As your eye travels left the stock has fallen, and as it travels right the stock has risen.
• The vertical axis is your profit or loss on the whole position, measured in rupees for one lot of 500 shares. Above the zero line you are in profit, below it you are in loss.

The single most important feature is the zero line, the horizontal level where profit and loss is exactly nothing. Wherever the strategy line sits above zero you are making money, and wherever it sits below zero you are losing. The whole game is reading where that line lives at each possible closing price.

The two lines: expiry and today

Look closely at any chart in this course and you will notice two lines, not one. They tell two different stories and you need both.

• The solid white line is the value of your position at expiry, on the final day when all time value has drained away and only intrinsic value remains. This is the clean, kinked shape most people mean when they say payoff. It is what you keep or owe if you hold to the last bell.
• The dotted cyan line is the value of your position today, often written as T+0, meaning zero days have passed. It is smoother and rounder because the options still carry time value.

The two lines differ because of time. An option is worth more before expiry than at expiry for the same stock price, since there is still time for the stock to move your way. That extra worth is time value, and it melts away as expiry approaches. By the final day the dotted today curve has collapsed onto the solid expiry line. So the dotted line shows roughly what your screen would show now, and the solid line shows where you are heading if nothing is closed early.

Profit zones and loss zones

Once you see the zero line, the chart splits naturally into two regions.

• The profit zone is every closing price where the expiry line sits above zero. In our charts this region is shaded green.
• The loss zone is every closing price where the expiry line sits below zero, shaded red.

The exact price where the solid line crosses the zero line is the breakeven, the closing price at which you neither make nor lose. Some strategies have one breakeven, many have two. Everything to one side is profit and everything to the other is loss, so the breakeven is the boundary fence between the green and the red.

Two more landmarks finish the picture. The maximum profit is the highest the expiry line ever reaches, and the maximum loss is the lowest it ever sinks. For a defined-risk strategy both of these are flat, finite levels, so you know your best and worst case before you ever place the order. We mark the spot price, 1320 for RELIANCE, as an amber dotted vertical line, and we drop an amber dot on each breakeven, so your eye lands on the key prices instantly.

Legs: the pieces you stack

A leg is one single option in your position. You already know the four legs from Options Basics, the four atoms every strategy is built from.

• Buy a call, the right to buy, used when you expect a rise.
• Sell a call, the obligation to deliver if assigned, used when you expect a stock to stay below a level.
• Buy a put, the right to sell, used when you expect a fall.
• Sell a put, the obligation to buy if assigned, used when you expect a stock to stay above a level.

A strategy is simply two or more legs held at the same time, on the same underlying and expiry, chosen so their combined payoff has a shape you want. When you sell one leg, the premium you collect helps pay for the leg you buy. That is the quiet magic behind almost every spread. One leg funds another, which lowers your cost or your risk in exchange for capping your reward. The combined payoff is just the sum of the legs, added up rupee by rupee at every price.

What the strategy builder does

OpenAlgo includes a strategy builder that does this adding-up for you. You pick your legs, you set the strikes and the buy or sell side for each, and it draws the combined payoff from exactly the same maths used to make every chart in this course. The premiums come from real RELIANCE option prices, modelled with Black-76 off the synthetic future, the correct method for Indian options. You are not guessing the shape, you are seeing it.

This matters for a beginner more than anything else. Before you risk a single rupee, you can stack legs, watch the breakevens, maximum profit and maximum loss update, and decide whether the shape suits your view. You can also test orders without real money first, using sandbox trading (analyzer mode in OpenAlgo), so the mechanics are familiar before real capital is involved.

Reading one real example end to end

Let us read a real strategy together, the bull call spread, so the whole picture clicks. It is a mildly bullish trade with just two legs.

You buy the 1320 call and sell the 1360 call. The call you sell brings in premium that pays down most of the cost of the call you buy, so the position costs far less than a lone call. That net cost, the net debit, is the most you can lose. Here are the three numbers the engine reports.

Now read the chart. Below 1320 both calls expire worthless and you lose the whole net debit, Rs 7,795. That flat floor on the left is your maximum loss. As RELIANCE climbs past 1320 the bought call gains value and your loss shrinks, until at the breakeven of 1336 the solid line crosses zero and you start to profit. Above 1360 both calls are deep in the money, the spread is fully open, and your profit stops growing at its ceiling of Rs 12,205. That flat roof on the right is your maximum profit. The dotted today line shows the same journey rounded off, since time value is still present now and will be gone by expiry.

That is the entire method. Find the zero line, the breakeven, the green and red zones, and the two flat ceilings. Do that on any chart and you have read the strategy. The chapters ahead simply walk you through the most useful shapes one at a time, always with their three numbers and always honest about the risk. Next we slow down and study those three numbers, breakeven, maximum profit, and maximum loss, because they are the language every strategy speaks.