20 Numbers are written on the board: 1, 2, ... ,20. Two players are putting signs before the numbers in turn (+ or -), where they desire. The first wants to obtain the minimal possible absolute value of the sum.

What is the maximal value of the absolute value of the sum that can be achieved by the second player?

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## BMAD

20 Numbers are written on the board: 1, 2, ... ,20. Two players are putting signs before the numbers in turn (+ or -), where they desire. The first wants to obtain the minimal possible absolute value of the sum.

What is the maximal value of the absolute value of the sum that can be achieved by the second player?

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