If your win rate is 40%, the odds are 0.8, and you lose an average of 0.28 times your principal each time you bet (assuming the bet amount is A). In the long run, for example, after betting 10,000 times, since the average return is negative, a losing streak will inevitably occur. For instance, according to the improved Martingale strategy (earn 5U in the first 3 bets, break even in the 4th bet, and protect 90% of the principal from the 5th bet onwards), an initial principal of 1800U cannot avoid being reduced to zero—losing streaks of 6 or more are highly probable. Therefore, in the long term, the betting principal will inevitably be wiped out. It is recommended to find a method with a higher win rate and better odds.

Core data
Principal: 1800U
Maximum consecutive losses: 6 times
Win rate: 40%

Betting limit: 750UInitial profit: 5UGive up profit: From the 4th time (P = 0U)Capital preservation ratio: From the 5th time 90%Betting amount (rounded up): 5U, 13U, 29U, 59U, 119U, 268URequired principal: 493UProbability of losing 6 times: 4.6656%Maximum bearable consecutive losses: 8 times (1765U)ExplanationA profit of 5U in the first 3 times is reasonable, give up profit on the 4th time, preserve 90% of the principal on the 5th time, 493U is far lower than 1800U, safe and efficient.If it's purely a mathematical formula derivation and calculation, the improvement of the Martingale strategy is indeed effective. However, why do some people encounter 11 consecutive losses? I believe that after four or five consecutive losses, your win rate may drop sharply to below 10%. Because at this point, the principal investment increases, and emotions and actions are fully dominated by human factors such as fear; you have become the '80' or even '90' in the 80/20 rule. Therefore, if you feel out of control after four or five consecutive losses, you should stop immediately, or switch to coin toss decision-making (50% stable probability), or lower profit targets (such as only making 2-3U each time) to increase the number of consecutive losses you can bear. Share your core data in the comments section, and I can use this strategy to calculate and analyze for you. Different viewpoints and opinions are welcome for discussion.