The American Checker Federation

[Event "US National 1954"] [Date "1954"] [Black "Hanson, K."] [White "Cameron, A."] [Result "1/2-1/2"] 11-16 21-17 7-11 17-14 10-17 22-13 11-15 23-19 16-23 26-10 6-15 13-6 1-10 25-22 12-16 29-25 16-19 25-21 10-14 22-17 2-7 17-10 7-14 27-23 19-26 31-2...

[Event "US National 1954"] [Date "1954"] [Black "Axford, H."] [White "Crawford, C."] [Result "1/2-1/2"] 11-15 21-17 8-11 17-13 9-14 22-18 15-22 25-9 5-14 29-25 11-15 25-22 14-18 23-14 10-17 27-23 4-8 24-19 15-24 28-19 8-11 22-18 11-15 18-11 7-16 31-2...

[Event "US National 1954"] [Date "1954"] [Black "Phelps, R."] [White "Ricca, J."] [Result "0-1"] 10-15 21-17 6-10 17-14 9-18 23-14 10-17 22-13 11-16 25-22 8-11 26-23 16-19 23-16 11-20 24-19 15-24 28-19 4-8 22-18 8-11 29-25 11-16 27-23 20-24 18-15 16-...

[Event "US National 1954"] [Date "1954"] [Black "Levitt, L."] [White "Case, B."] [Result "1/2-1/2"] 10-14 22-17 7-10 17-13 3-7 24-20 14-18 23-14 9-18 26-23 10-14 28-24 11-15 23-19 7-11 19-10 6-15 30-26 12-16 13-9 1-6 25-22 6-13 22-17 13-22 26-10 18-2...

[Event "US National 1954"] [Date "1954"] [Black "Loew, M."] [White "Link, W."] [Result "1/2-1/2"] 9-14 22-17 6-9 23-19 9-13 27-23 13-22 25-9 5-14 29-25 11-15 25-22 7-11 22-17 11-16 24-20 15-24 28-19 3-7 20-11 8-24 32-28 4-8 28-19 7-11 17-13 11-16 26-...

These games were apparently not in the OCA archive. [Event "US National 1954"] [Date "1954"] [Black "Sprague, J."] [White "Gould, R."] [Result "1/2-1/2"] 9-13 21-17 5-9 25-21 9-14 30-25 11-15 24-19 15-24 28-19 8-11 22-18 13-22 18-9 6-13 26-17 13-22 2...

[Event "U.S. National 1956"] [Date "1956"] [Black "White, O."] [White "Cummings, W."] [Result "0-1"] 12-16 21-17 9-14 17-13 16-20 22-18 11-15 18-11 8-15 24-19 15-24 28-19 4-8 25-22 8-11 19-16 14-17 29-25 17-21 22-18 10-15 25-22 5-9 32-28 7-10 16-7 2-...

[Event "U.S. National 1956"] [Date "1956"] [Black "Thompson, P."] [White "Sides, J."] [Result "1/2-1/2"] 10-14 23-19 11-16 26-23 9-13 22-17 13-22 25-9 5-14 24-20 6-10 20-11 8-24 28-19 4-8 29-25 8-11 25-22 11-15 32-28 15-24 28-19 7-11 22-18 1-5 18-9 5...

I was just looking at the 1956 National games in the OCA archive. And it seems to just have Tinsley games. I typed these games from the ACF Bulletin from back then. [Event "U.S. National 1956"] [Date "1956"] [Black "Shoaf, I."] [White "Grandjean, B."] [Result ...

[Event "Hester's Defiance, p.108, v.361, J. Lees"] [Date "1960"] [Black ""] [White ""] [Result "1/2-1/2"] 11-15 23-19 9-14 27-23 8-11 22-18 15-22 25-9 5-14 29-25 11-15 24-20 15-24 28-19 10-15 19-10 6-15 25-22 15-19 23-16 12-19 32-28 7-10 31-27 4-8 27...

[Event "Hester's Defiance, p.89, v.271"] [Date "1960"] [Black "Campbell"] [White "Battersby"] [Result "1/2-1/2"] 11-15 23-19 9-14 27-23 8-11 22-18 15-22 25-9 5-14 29-25 11-15 25-22 4-8 24-20 15-24 28-19 10-15 19-10 6-15 22-18 15-22 26-10 7-14 30-25 8...

[Event "Hester's Defiance, p.69, v.181, unknown"] [Date "1960"] [Black ""] [White ""] [Result "1/2-1/2"] 11-15 23-19 9-14 27-23 8-11 22-18 15-22 25-9 5-14 29-25 11-16 24-20 3-8 20-11 8-24 28-19 4-8 25-22 8-11 22-18 1-5 18-9 5-14 30-25 11-15 19-16 12-...

[Event "Hester's Defiance, p.49, v.91, G. Price"] [Date "1960"] [Black ""] [White ""] [Result "1/2-1/2"] 11-15 23-19 9-14 27-23 8-11 22-18 15-22 25-9 5-14 29-25 6-9 25-22 9-13 24-20 1-5 22-18 14-17 21-14 10-17 26-22 17-26 31-22 7-10 30-25 3-8 25-21 1...

The title of the book is Tournament Checkers, Defiance System. [Event "Hester's Defiance, p.28, J. MacFarlane"] [Date "1960"] [Black ""] [White ""] [Result "1/2-1/2"] 11-15 23-19 9-14 27-23 8-11 22-18 15-22 25-9 5-14 29-25 6-9 25-22 9-13 24-20 11-15 ...

[Event "2024 World Qualifier, Rd.5"] [Date "2024"] [Black "Ronald King"] [White "Melikaya Nonyukela"] [Result "0-2"] 1. 11-16 21-17 2. 16-20 17-13 3. 8-11 22-18 4. 9-14 18x9 5. 5x14 25-22 6. 11-15 29-25 7. 14-17 23-18 8. 7-11 25-21 9. 3-7 21x14 10. 1...