(related to Problem: A New Bishop's Puzzle)
Play as follows, using the notation indicated by the numbered squares in Diagram A:—
| Move | White | Black |
|---|---|---|
| 1. | 18—15 | 3—6 |
| 2. | 17—8 | 4—13 |
| 3. | 19—14 | 2—7 |
| 4. | 15—5 | 6—16 |
| 5. | 8—3 | 13—18 |
| 6. | 14—9 | 7—12 |
| 7. | 5—10 | 16—11 |
| 8. | 9—19 | 12—2 |
| 9. | 10—4 | 11—17 |
| 10. | 20—10 | 1—11 |
| 11. | 3—9 | 18—12 |
| 12. | 10—13 | 11—8 |
| 13. | 19—16 | 2—5 |
| 14. | 16—1 | 5—20 |
| 15. | 9—6 | 12—15 |
| 16. | 13—7 | 8—14 |
| 17. | 6—3 | 15—18 |
| 18. | 7—2 | 14—19 |
Diagram B shows the position after the ninth move. Bishops at $1$ and $20$ have not yet moved, but $2$ and $19$ have sallied forth and returned. In the end, $1$ and $19,$ $2$ and $20,$ $3$ and $17,$ and $4$ and $18$ will have exchanged places. Note the position after the thirteenth move.
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