White men on 12, 20. Kings on 1, 2.
White to move, Black to win.
| 1- 6 | 18-14 | 1- 6 | 7-10 |
| 27-23 | 5- 1 | 5- 1 | 18-23 |
| 6-10 | 14- 9 | 6- 9 | 10-15 |
| 23-18 | 6- 2 | 19-15 | 23-27 |
| 10- 6 | 13-17 | (b) 9- 5 | 15-19 |
| 18-14 | 1- 5 | 11- 7 | 27-32 |
| 6- 1 | 17-14 | 14- 9 | 19-23 |
| 14-17 | 5- 1 | 7- 2 | 32-28 |
| 1- 6 | 9- 5 | 9-13 | 6-10 |
| 19-23 | 2- 6 | 15-11 | 28-24 |
| 6- 9 | 14-18 | 13-17 | 10-15 |
| 23-18 | 6-10 | 3- 7 | Black |
| 2- 6 | 18-23 | 17-14 | wins. |
| 17-13 | (a)10-14 | 2- 6 | |
| 9- 5 | 23-19 | 14-18 |
Var. (a.)
| 10- 6 | 19-15 | 6- 2 | Black |
| 23-19 | 2- 6 | 17-10 | wins. |
| 6- 2 | 3-7 |
Var. (b.)
| 9-13 | 17-21 | 17-13 | 20-16 |
| 11- 7 | 1- 6 | 10-14 | 18-15 |
| 14-17 | 13-17 | 13-17 | Black |
| 15-18 | 6-10 | 7-10 | wins. |
XVII
The position given in the last easy lesson showed a Black win when it was White’s turn to play, but it is only a draw if Black had to play first. Let the student add to the diagram the condition “Black to move, White to draw.”