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Each account trades once a day, risking 2% per trade at RR 1:1. Holding this fixed, we ran the same signal split across 1 account, 3 accounts (by strategy), 5 accounts (by weekday), and 15 accounts (strategy × weekday) over 5.7 years of real data from 2021. The strategy itself loses — a 47.8% win rate with negative expectancy. Even so, splitting into 5 or more accounts kept every one of the 6 years in the black, while the 1-account version had a losing year. Of the 90 account-years across the individual accounts, 50 were losing years — yet bundled together, the losing years disappear. That's the effect of diversification. Finally, moving only the win rate with the same setup: 55% wins gives ¥17.34M a year, while 45% gives just ¥1.1M and losing years return. Diversification firms up the floor; whether you get a big upside comes down to edge.