| Number | Name | Date | Kind |
|---|---|---|---|
| 1472657 | Lillard | Oct 1923 | A |
| 2196861 | Gruber | Apr 1940 | A |
| 2665913 | Hlavac | Jan 1954 | A |
| 3751039 | Dykoski | Aug 1973 | A |
| 4326720 | Erlich | Apr 1982 | A |
| 4984808 | Young | Jan 1991 | A |
| 5314189 | Kerivan | May 1994 | A |
| 6142474 | Tachkov et al. | Nov 2000 | A |
| Entry |
|---|
| Fred Reinfeld, Book Excerp, How To Win At Checkers, pp. 178-184 (1957). |