| Number | Name | Date | Kind |
|---|---|---|---|
| 1295993 | Kleissl | Mar 1919 | |
| 1572254 | Torunes | Feb 1926 | |
| 3767201 | Harper | Oct 1973 | |
| 4477080 | Baker | Oct 1984 | |
| 4842282 | Sciarra | Jun 1989 | |
| 4895375 | Blitz | Jan 1990 | |
| 5004245 | Schumacher | Apr 1991 | |
| 5033751 | Ching | Jul 1991 | |
| 5112056 | Ching | May 1992 | |
| 5306016 | McInnis | Apr 1994 | |
| 5338040 | Cutler | Aug 1994 |
| Entry |
|---|
| Essentials of Modern Backgammon Copy Right Heines House 1975 pp. 1-11. |
| The Complete Book of Games by Clement Wood and Gloria Goddard, Copyright 1940 p. 338. |