From the book: Game Theroy

(6) Push is a partizan game played on a 1 n array. Each cell is either empty or contains an L or an R. On Louise's turn, she may choose any L to push one cell to the left. Similarly, on Richard's turn, he may choose any R to push one cell to the left. Each cell can contain at most one letter, so if a letter gets pushed into an already occupied cell, the letter in that cell gets pushed one cell further to the left, and so on. Any letter which gets pushed from the leftmost square falls out of the array and disappears. Find a dyadic position equivalent to the Push position R RL (6) Push is a partizan game played on a 1 n array. Each cell is either empty or contains an L or an R. On Louise's turn, she may choose any L to push one cell to the left. Similarly, on Richard's turn, he may choose any R to push one cell to the left. Each cell can contain at most one letter, so if a letter gets pushed into an already occupied cell, the letter in that cell gets pushed one cell further to the left, and so on. Any letter which gets pushed from the leftmost square falls out of the array and disappears. Find a dyadic position equivalent to the Push position R RL