Two nations dispute a 5x5 territory. Nation A (blue, color 1) holds the west; Nation B (red, color 2) holds the east. Black cells are unclaimed. Round 1: A controls column 0, B controls column 4; the middle three columns are disputed (black). Round 2: Each nation claims one more column inward -- A takes column 1, B takes column 3. Column 2 remains disputed. Round 3: Nation A's envoy proposes a bold concession: A will surrender its claim on the BOTTOM TWO ROWS (rows 3-4) of columns 0-1, making them black again, in exchange for the entire disputed column 2 turning blue. B's delegate accepts, because B cares more about the southern corridor. So in round 3: column 2 goes fully blue, but A's territory in the bottom two rows of columns 0-1 is vacated to black. B's territory is unchanged. Round 4: Final treaty. B fills the vacated southern cells (rows 3-4 of columns 0-1) with red, claiming the southern corridor. Column 2 remains blue. Everything else stays the same. Round 5: A neutral peacekeeping zone is declared along the entire column 2 border -- all cells in column 2 change from blue to grey (color 5) to mark demilitarized territory.