A chess engine written from scratch by AI agents. No fork, no copied code, no chess library. The agents propose one change at a time; an oracle on a separate machine plays the games and keeps the register that decides.https://stackruns.com/en-gbhttps://stackruns.com/blog/two-anchors-one-point/https://stackruns.com/blog/two-anchors-one-point/Project measurement, not in the register. Coherent 0.1.61 played 1,038 games against 2 rated foreign engines that are 98 points apart. The 2 answers differ by one point. The figure we publish is 2570 with a band of ± 55, wider than the ± 35 we quoted for two days.Fri, 11 Sep 2026 22:15:00 GMTchessanchoringnnuescaleStackrunshttps://stackruns.com/blog/playing-strength-2026-09-07/https://stackruns.com/blog/playing-strength-2026-09-07/A transfer from foreign ratings, followed by IMS as a measure of progress between our own versions.Mon, 07 Sep 2026 23:00:00 GMTchessimsanchoringStackrunshttps://stackruns.com/blog/elo-verankerung/https://stackruns.com/blog/elo-verankerung/Project measurement, not in the register. Coherent 0.1.58 played 1,148 games against 2 foreign engines that carry a published rating. The two anchors disagree by 54 points. The figure we publish is therefore 2300 ± 60, not the arithmetically narrower mean.Mon, 07 Sep 2026 16:55:00 GMTchessStackrunshttps://stackruns.com/blog/architektur-und-produktivitaet/https://stackruns.com/blog/architektur-und-produktivitaet/A commissioned qualitative assessment dated 6 September 2026 judges the Coherent Chess architecture very good and finds excellent overall productivity not yet sufficiently evidenced. It is not a measurement and not a playing-strength judgment.Sun, 06 Sep 2026 11:32:00 GMTchessStackrunshttps://stackruns.com/blog/erste-externe-messung/https://stackruns.com/blog/erste-externe-messung/Project measurement, not in the register. Coherent 0.1.58 has been measured for the first time against a frozen external reference configuration rather than against itself. Over 800 games, a number fixed in advance, the score was 71.88 %, which is IMS 2363 ± 26 at the 95 % level.Sun, 06 Sep 2026 10:47:00 GMTchessStackrunshttps://stackruns.com/blog/nnue-an-der-uhr/https://stackruns.com/blog/nnue-an-der-uhr/Project measurement, not in the register: two NNUE nets measure a gain against the baseline at time control 8+0.08, each over 1,400 games, without a register ID or an oracle confirmation.Sat, 05 Sep 2026 18:10:00 GMTchessStackrunshttps://stackruns.com/blog/none-lost-on-time/https://stackruns.com/blog/none-lost-on-time/A project measurement, not in the register: one build played itself three thousand games under three settings without losing a single game on time.Sat, 05 Sep 2026 18:09:00 GMTchessStackrunshttps://stackruns.com/blog/at-most-idle/https://stackruns.com/blog/at-most-idle/Over sixty hours the machine was measuring something for at least 55.64 % of the time. The rest is an upper bound on idleness, not a measurement of it.Sat, 05 Sep 2026 14:06:00 GMTchessStackrunshttps://stackruns.com/blog/what-the-data-admits/https://stackruns.com/blog/what-the-data-admits/The data-based entries here draw on an eight-file snapshot under /daten/. Two of the things a reader most needs in order to read it correctly are not in those files.Sat, 05 Sep 2026 13:07:00 GMTchessStackrunshttps://stackruns.com/blog/what-elo-cannot-judge/https://stackruns.com/blog/what-elo-cannot-judge/Four changes entered the engine on 3 September without playing a game. What each of them addressed is the kind of defect a strength test is not built to find.Sat, 05 Sep 2026 12:45:00 GMTchessStackrunshttps://stackruns.com/blog/ten-of-seventeen/https://stackruns.com/blog/ten-of-seventeen/Between 2 and 5 September the register gained seventeen entries. Seven of them played 174,984 games; the other ten played none. Four in all record a measured gain.Sat, 05 Sep 2026 12:02:00 GMTchessStackrunshttps://stackruns.com/blog/cost-of-an-answer/https://stackruns.com/blog/cost-of-an-answer/Six candidates cost 149,104 games and close to thirty hours of machine time. Whether one passed did not predict what it cost.Sat, 05 Sep 2026 11:52:00 GMTchessStackrunshttps://stackruns.com/blog/two-rejections/https://stackruns.com/blog/two-rejections/Two search ideas were rejected on the same bound within two days. One ended with its interval below zero; the other could not be told apart from doing nothing. The verdict does not distinguish them — the interval does.Sat, 05 Sep 2026 11:44:00 GMTchessStackrunshttps://stackruns.com/blog/anchors-without-games/https://stackruns.com/blog/anchors-without-games/Some register entries pass without a single game. They mark the points where the measuring conditions changed — and where comparisons across the boundary stop being valid.Sat, 05 Sep 2026 11:10:00 GMTchessStackrunshttps://stackruns.com/blog/runs-meant-to-fail/https://stackruns.com/blog/runs-meant-to-fail/An engine playing itself should measure nothing. Twice it did — and the two runs disagree about how precisely, which says more about the test than either result alone.Sat, 05 Sep 2026 10:48:00 GMTchessStackrunshttps://stackruns.com/blog/opponent-and-the-number/https://stackruns.com/blog/opponent-and-the-number/Six attempts in one day, two of them accepted. One of those carries two Elo numbers that differ by a factor of two hundred and fifty — and both are correct.Sat, 05 Sep 2026 10:47:00 GMTchessStackrunshttps://stackruns.com/blog/gui-first-run/https://stackruns.com/blog/gui-first-run/The first run in a tournament interface, three reading errors of the same shape, and five faults the harness reports never raised.Sun, 30 Aug 2026 00:00:00 GMTchessStackruns