70th U.S. Open, Lincoln 1969

◇An incomplete record

This collection preserves 352 scores. Lapiken’s published twelve-round results identify three fixtures absent from the Mega2024 source archive: his round-one draw with D. Gustafson, round-three win over J. Ellis and round-eleven win over W. Beattie. The full tournament’s played-game total has not been established, so no total is calculated from the number of entrants and rounds.

The director reported a master withdrawing after round nine without notifying him. He also described players leaving games in progress and allowing their clocks to expire. Withdrawals, unplayed defaults and byes cannot be counted as missing played games merely because no score survives.

◇Two printed-score conflicts

Popel–Chalker ends in checkmate on Black’s fourteenth move. The director’s printed score gives 13...Qh5, while the preserved source score gives 13...Qe5. Both continuations are legal and lead to 14...Qxh2 mate; the thirteenth move remains unresolved. The report calls Black W. Chalker, while the archive identifies him as Robert P. Chalker; the contemporary rating list names R. Chalker of Texas at 1808.

Liepnieks’s own September 1969 annotations end his win over Cunningham at 42.Rc8, with Black resigning. The preserved source score continues to 51...Nb5 with the same result. The opening 83 plies agree, while its additional 19 half-moves have not been established as played or as analysis. ChessBase’s later published score agrees with this longer archive version; it does not resolve the difference with the participant’s report.

Doug Colton’s nine-move victory over Richard Dermer is printed in the director’s account and agrees exactly with the shortest preserved score.

◇Recorded rounds and dates

The source lists two games for Max Wilkerson in round three, against Winterton and Rhee, and two for John Bob Payne in round nine, against Brown and Harger. These round labels are inconsistent; their historical assignments remain unresolved.

Three source dates differ from the original advertised round-start schedule: Cook–Pruner is labeled round two on 10 August rather than 11 August, Payne–Tiers round four on 15 August rather than 13 August, and Zalys–Gauntt round ten on 22 August rather than 20 August. An advertised schedule does not establish an individual game’s actual date. The collection preserves these source fields and the inconsistent round labels without inventing replacements.

◇Player names

Bisguier’s firsthand account supplies William Batchelder’s correctly spelled first name. Spence’s contemporary Nebraska table identifies Jack Hollis and Erik Kaarma. The source spelling Sabdir Tresz has been normalized to Sandor Tresz by an identity conjunction: the original 1968 Oakland full name, the California 1813 rating in 1969 and matching Oakland 1813 rating in 1970, and the original 1971 U.S. Open listing of Sandor Tresz of California. The identification is an inference from those period records and the archive’s U.S. Open history; a direct original Lincoln full-name listing has not been viewed.