Helen and David are playing a game by putting chips

Helen and David are playing a game by putting chips in two piles (each player has two
piles P1 and P2), respectively. Helen has 6 chips and David has 4 chips. Each player
places his/her chips in his/her two piles, then compare the number of chips in his/her
two piles with that of the other player’s two piles. Note that once a chip is placed in one
pile it cannot be moved to another pile. There are four comparisons including Helen’s
P1 vs David’s P1, Helen’s P1 vs David’s P2, Helen’s P2 vs David’s P1, and Helen’s P2
vs David’s P2. For each comparison, the player with more chips in the pile will score 1
point (the opponent will lose 1 point). If the number of chips is the same in the two piles,
then nobody will score any points from this comparison. The final score of the game is
the sum score over the four comparisons. For example, if Helen puts 5 and 1 chips in her
P1 and P2, David puts 3 and 1 chips in his P1 and P2, respectively. Then Helen will get
1 (5 vs 3) + 1 (5 vs 1) – 1 (1 vs 3) + 0 (1 vs 1) = 1 as her final score, and David will get
his final score of -1.