Stackruns

Coherent 0.1.109: 3326 ± 53 over four anchors

Published Updated chess-reporter Project: Coherent Chess anchoringmeasurement

Created by AI from the text of this post and read by a synthetic voice; not a word-for-word version, and it may contain errors.

Project measurement, not in the register: an anchoring against foreign engines with a listed rating. The figures come from the data delivery (entry E-NNNN One Elo measurement: a build anchored against foreign engines with a listed rating, on a measuring machine of its own. Numbered in the order delivered; the register run it measured is named with it. E-0001 to E-0012; from the thirteenth entry on the prefix is M, the count running on.); the build measured is the one from run T-0123 of 24 September 2026. The reservations below are those delivered by the day of publication; the full and current account is on the playing-strength page.

Coherent 0.1.109 played 1,800 games against four foreign engines with a published rating, Combusken 2.0.0, Zahak 9.0, Velvet 3.3.0 and Princhess 0.22.0, 450 against each at 120+1. The result is 3326 ± 53 (anchored to CCRL Computer Chess Rating Lists, a public ranking of chess engines from games under standard conditions. blitz ratings), ± 12 of it statistical. From 24 September 2026 that is the figure at the head of this site; it replaces the anchoring of 0.1.108 at 3274 ± 55.

The runs

Coherent 0.1.109: the anchors and the published figure — Project measurement, not in the register Project measurement, not in the register. Four horizontal intervals, one per opponent, on a scale of anchored playing strength: Combusken 2.0.0 at 3308 with a half-width of 23, Zahak 9.0 at 3310 with a half-width of 23, Velvet 3.3.0 at 3325 with a half-width of 25, Princhess 0.22.0 at 3361 with a half-width of 25. Below them the published figure for 0.1.109, 3326 with a band of 53, shaded behind every row. The plus-minus values are half-widths of nominal 95 % intervals; the published band also carries the transfer term. 3260 3280 3300 3320 3340 3360 3380 3400 Combusken 2.0.0 3308 ± 23 Zahak 9.0 3310 ± 23 Velvet 3.3.0 3325 ± 25 Princhess 0.22.0 3361 ± 25 0.1.109 published 3326 ± 53 playing strength anchored to CCRL blitz ratings
Each row is one opponent: the value anchored through it, with its 95 % half-width. The bottom row is the published figure for 0.1.109, 3326 ± 53; the shaded strip carries its band, transfer term included, across all rows. Project measurement, not in the register.
OpponentListedGamesScore rateDifferenceFrom it
Combusken 2.0.03271 ± 845055.33 %+37.20 ± 21.203308 ± 23
Zahak 9.03291 ± 1245052.78 %+19.32 ± 19.693310 ± 23
Velvet 3.3.03329 ± 1445049.44 %−3.86 ± 20.243325 ± 25
Princhess 0.22.03357 ± 1645050.56 %+3.86 ± 19.673361 ± 25

All half-widths at the 95 % level, as the delivery states them; the column From it is the anchor plus the measured difference. The listed ratings are from the CCRL Blitz Rating List as of 2026-09-12.

How the figure is formed

Recalculated from the anchors: the four anchored values, averaged with weights inverse to their variance, give 3324.2 with a statistical half-width of ± 11.9; the delivery rounds it to ± 12. With the measuring side's transfer term the band is ± 52.4; the delivery names 3326 ± 53, and this site publishes the delivery's figure. The anchored values contradict one another (chi-square 11.52 at 3 degrees of freedom, bound 7.81; half-widths read as 95 % half-widths).

Against 0.1.108 no anchor was played in both campaigns; the 52 points between the two headline figures are therefore not a measured gain.

What belongs to this figure

  1. Measured outside the formal registration procedure. Every result line of this measurement path is recorded twice, independently, with its checksum.
  2. The calibration of the total band is not confirmed from the complete raw data.
  3. The evidence for the scale showing that this book maps one-to-one onto the list at 2+1 comes from a round robin with three openings per pairing across ten colour-swapped rounds. The grouping is not accounted for in the calculation supplied (intraclass correlation approximately 0.30, factor 1.93), so the evidence is approximately half as strong as reported. This is a reservation against the model assumption, not against the error calculation: The anchor runs themselves had a distinct opening for each colour pair (225 of 225 per anchor), and the statistical half-width of 11.9 remains unaffected by this.
  4. Statistical half-width plus transfer uncertainty. A round robin among the five anchors showed that an individual published rating deviates under external conditions; averaged across four anchors, ± 51 of this remains at the 95-percent level, which, together with the ± 11.9 from games and list errors, yields ± 53.

Without a provenance record in the delivery: Combusken 2.0.0, Zahak 9.0, Velvet 3.3.0 and Princhess 0.22.0.

Conditions

120+1, book 8moves_v3 with 34,700 positions, each colour pair with an opening of its own, 64 MB hash, one thread, 30 concurrent games, no adjudication, a fixed number of games without SPRT Sequential probability ratio test. Games are played until the accumulated evidence reaches one of two bounds; then the test stops.; 0 losses on time. The measurement is dated 24 September 2026, 18:50 UTC.

Generated from the data delivery. The recalculation is the site's; every other figure is the measuring side's.