The Nifty 50 witnessed consolidation on October 27, the monthly F&O expiry day, before closing marginally lower with a negative bias. The index attempted to extend its recovery and tested the 20-day exponential moving average (EMA) at 22,824 but failed to sustain above this level at the close. According to market experts, the 20-day EMA is expected to act as an immediate resistance, followed by the 23,000–23,200 zone, which remains a critical hurdle.