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ASU 010 All Russian MO 1961 9.5 game strategy

Source:

June 17, 2019
combinatoricsgame strategy

Problem Statement

Nicholas and Peter are dividing (2n+1)(2n+1) nuts. Each wants to get more. Three ways for that were suggested. (Each consist of three stages.) First two stages are common.
1 stage: Peter divides nuts onto 22 heaps, each contain not less than 22 nuts. 2 stage: Nicholas divides both heaps onto 22 heaps, each contain not less than 11 nut. 3 stage:
1 way: Nicholas takes the biggest and the least heaps. 2 way: Nicholas takes two middle size heaps. 3 way: Nicholas takes either the biggest and the least heaps or two middle size heaps, but gives one nut to the Peter for the right of choice.
Find the most and the least profitable method for the Nicholas.