Copeland

Violation of Strategy Proofness

Profile type: ProfileWithTies
Config: 3 c, 2 v
Parameters: set_preference=pessimist

Violation of Strategy-Proofness for Copeland under the pessimist set preference.
A voter can benefit by changing their ranking from ( 0  1 ) 2  to 0 1 2 .

Original Profile:
+-----+-----+
|  1  |  1  |
+-----+-----+
|  2  | 0 1 |
| 0 1 |  2  |
|     |     |
+-----+-----+
ProfileWithTies([{0: 1, 1: 1, 2: 0}, {2: 1, 0: 0, 1: 0}], rcounts=[1, 1], cmap={0: 0, 1: 1, 2: 2})

Copeland winners are {0, 1, 2}

New Profile:
+-----+---+
|  1  | 1 |
+-----+---+
|  2  | 0 |
| 0 1 | 1 |
|     | 2 |
+-----+---+
ProfileWithTies([{0: 1, 1: 1, 2: 0}, {2: 2, 1: 1, 0: 0}], rcounts=[1, 1], cmap={0: '0', 1: '1', 2: '2'})

Copeland winner is {0}