Order blocks and fair value gaps: where the big orders sit on a NIFTY chart
Large orders do not fill in one candle. They leave two footprints on the chart that price tends to revisit.
Order block
The last candle against the move before a break of structure. Before a sharp rally that breaks a swing high, look for the last red candle: that candle's range is the bullish order block. Institutions accumulated there, the market ran, and unfilled orders remain. A return to the block is a place to buy, or to sell puts below it. The block dies when price closes through it.
Fair value gap
A three-candle imbalance: when the low of candle three is above the high of candle one, the middle candle moved so fast that no trading happened in the gap. Markets tend to come back and fill it. Until then it acts as a magnet and, when price returns, as support in an uptrend.
Rules that can be coded
Vague definitions produce vague trades, so use strict ones. Order block: the last opposite-colour candle within twenty bars before a BOS or CHoCH, valid until a close beyond its far edge. FVG: low[i] > high[i−2] for bullish, high[i] < low[i−2] for bearish, valid until price trades through the gap's far edge. These are the definitions the VIP Indicator uses, so what you see on the chart is reproducible.
Trading a return
Wait for price to enter a zone in the direction of structure, then look for a rejection candle or a displacement away from it. Sellers: sell the option on the other side of the zone. Buyers: enter with the stop beyond the zone. The zone gives you the location; the stop is defined for you.