Examples:

In a match to 4 games, A has won 3 games, B has won 0. What is the probability A will win the match?

A is 1 game away from winning, B is 4 games away. Inputting 1 and 4 gives win probability of .9375 for A.

In a match to 9 games, A has won 1 game, B has won 3. A has a 57.5% probability of winning each game. What is the probability A will win the match?

Input 8 and 6 for games needed for A and B, respectively. Input .575 for Probability A wins game. A has a .5002 probability of winning the match.