A | B1 | B2 | B3 | B4 | W |
B1 | 1 | 1 | 2 | 2 | 0.3333 |
B2 | 1 | 1 | 2 | 2 | 0.3333 |
B3 | 1/2 | 1/2 | 1 | 1 | 0.1667 |
B4 | 1/2 | 1/2 | 1 | 1 | 0.1667 |