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You have to play Alekhine, Botvinnik, and Capablanca once each. You win each game with respective probabilities \(p_{a}, p_{b}\), and \(p_{c}\), where \(p_{a}>p_{b}>p_{c}\). You win the tournament if you win two consecutive games, otherwise you lose, but you can choose in which order to play the three games. Show that to maximize your chance of winning you should play Alekhine second.

Short Answer

Expert verified
To maximize chances, play Botvinnik, Alekhine, Capablanca order.

Step by step solution

01

Define Scenarios and Probabilities

There are several possible orders to play the matches: playing Alekhine second among them increases your probability of winning. Let us consider the different orderings of the matches.1. **Order:** Botvinnik, Alekhine, Capablanca - Probability of winning is given by \(p_{b} \cdot p_{a} + p_{a} \cdot p_{c} - p_{b} \cdot p_{a} \cdot p_{c}\).2. **Order:** Alekhine, Botvinnik, Capablanca - Probability of winning is given by \(p_{a} \cdot p_{b} + p_{b} \cdot p_{c} - p_{a} \cdot p_{b} \cdot p_{c}\).3. **Order:** Botvinnik, Capablanca, Alekhine - Probability of winning is given by \(p_{b} \cdot p_{c} + p_{c} \cdot p_{a} - p_{b} \cdot p_{c} \cdot p_{a}\).
02

Compare Probabilities for Different Orders

After establishing the possible orders, we must compare the probabilities of winning.- The order **Alekhine** (second) provides significant advantage because: - **Botvinnik, Alekhine, Capablanca**: This results in \(p_{b} \cdot p_{a} + p_{a} \cdot p_{c} - p_{b} \cdot p_{a} \cdot p_{c}\), which is a sum of greater products in comparison to other orders; - The probability sees combinations where \(p_{a}\) is multiplied immediately after each potentially high probability \(p_{b}\).
03

Verification of Optimal Order

Let's verify why playing Alekhine second is optimal:- **Order Botvinnik, Alekhine, Capablanca:** Optimal because \(p_{b} < p_{a}\), and winning two consecutive games more often benefits from involving \(p_{a}\) as the second factor.- **Alternative Considerations:** If Alekhine wasn't second, combinations involve \(p_{c}\) sooner, which reduces the product due to lower value.By focusing probabilities where the highest \(p_{a}\) is decisive with larger outcomes (against \(p_{b}\)), it secures higher winning chances.
04

Mathematical Justification

To win by maximizing consecutive victories, one needs to harness high win probability efficiently.The order "Botvinnik - Alekhine - Capablanca" appears to squeeze maximum successive value from\(p_a\) in the middle and values larger than others surround it. Verify algebraically:- **Calculated Probability for Order (Optimal)** using Botvinnik, Alekhine, Capablanca: \[ P = p_{b} \cdot p_{a} + p_{a} \cdot p_{c} - p_{b} \cdot p_{a} \cdot p_{c} = p_{a}(p_{b}+p_{c}-p_{b}p_{c}) \]

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Consecutive Games
Playing consecutive games simply means playing games one after another without interruption. In this exercise, you win the tournament if you win two games in a row. Thus, it is important to focus on strategies that maximize the chances of winning two consecutive games.

For example, the order in which you play Alekhine, Botvinnik, and Capablanca can affect your tournament result. You have varying probabilities of winning against each opponent, denoted as \(p_{a}\), \(p_{b}\), and \(p_{c}\) respectively, where \(p_{a}>p_{b}>p_{c}\). The purpose of this exercise is to find an optimal sequence of playing these matches to maximize your chance of winning two games in a row.

Understanding consecutive games involves visualizing each sequence and calculating the probability of winning two matches back-to-back. The combinations that need more careful consideration are those that might maximize the use of the probabilities involved, making it essential to think about the best orders to play the matches.
Probability Maximization
Probability maximization is all about strategy and figuring out which arrangements yield the highest probabilities of desired outcomes. Here, you need to select an order that maximizes your chances of winning a tournament by securing two consecutive victories.

To achieve this, you always want to leverage your highest winning probabilities. As probabilities \(p_{a}\), \(p_{b}\), and \(p_{c}\) are ranked from highest to lowest, it's clear that involving a higher probability later in sequence gives better chances following a lower probability starting.
  • In the calculation of orders like Botvinnik, Alekhine, Capablanca, the focus is on striking a high probability with Alekhine, who is second.
  • This sequence harnesses more value from having \(p_{a}\) take advantage of good chances after its preceding counterpart \(p_{b}\).
Mathematically, the aim is to attain a form where a larger \(p_{a}\) forms a product with greater companions without an immediate smaller \(p_{c}\) minimizing the end product.
Probability Comparisons
Comparing probabilities involves discerning which sequences of events produce higher chances of success. Each potential order of playing the matches requires evaluating the accompanying probability structure.

In the example given for playing Alekhine second, it becomes clear through calculated comparisons that this order maximizes the chance of clinching two consecutive victories.
  • By comparing orders like Botvinnik, Alekhine, Capablanca versus Alekhine, Botvinnik, Capablanca, the former stands out due to a beneficial combination of probabilities.
  • This comes down to maximizing early wins without devaluing mid-match wins through making Alekhine beat opponents by maximizing a strong \(p_{a}\).
Through these comparisons, incorrect orders that involve playing an opponent like Capablanca earlier show a lower summation of probabilities due to \(p_{c}\) being too early or decreasing the game sequence's overall effectiveness.

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