White has two lines of play. First—
| 17-13 | 15-10 | 25-22 | 10-15 |
| 18-15 | 17-22 | 1- 6 | 22-25 |
| 9-14 | 10-14 | 22-25 | 15-18 |
| 1- 5 | 22-25 | 6-10 | Black |
| 14-17 | 1- 5 | 25-22 | wins. |
Second—
| (a) | 9- 5 | 1- 6 | 1- 5 | Black |
| 18-22 | 5- 1 | 22-17 | wins. | |
| 17-14 | 6- 2 | 14- 9 |
(a) Both 17-14 and 9-13 lose at once by 6-2.
XIII
A careful study of the principles underlying the play given in the positions in the eleventh and twelfth lessons will suffice to show the student how to secure success (if that is possible) when two Kings are opposed to man and King, the latter commanding or occupying his opponent’s double corner, where also the man can only hope to be crowned. If the single man and the King cannot be forced to take up some of the positions shown at some part of the different lines of the play, then the game will be drawn.