{"project":{"slug":"stockfish","name":"Stockfish","url":"https://heyresearch.xyz/project/stockfish"},"lens":"held","items":[{"id":"ship:5e3edb3d-240d-418f-acd9-1072e117e095","kind":"release","at":"2026-10-28T06:05:27.000Z","precision":"EXACT","title":"Stockfish dev-20261028-ff7cee42","summary":"Precompiled binaries of the latest Stockfish development version, built automatically on every commit. > [!NOTE] > For stable, thoroughly tested builds use the [official releases](https://github.com/official-stockfish/Stockfish/releases). > Pre-releases may contain bugs. *Some platforms ship a **universal binary** that automatically selects the best instruction set for your CPU - no manual selection needed.* --- ## Commits - [`ff7cee42`](https://github.com/official-stockfish/Stockfish/commit/ff7cee4244ec96ea488c402669e3674c0574dce6) *Update NNUE architecture to SFNNv19 and net nn-d1ee674a62ca.","recordedAt":"2026-10-28T23:12:09.671Z","discoveryLagHours":17.1,"eventType":"GITHUB_RELEASE","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"rolling_tag","contextWords":"Recorded, not counted: it was cut from a rolling tag (latest, nightly, a dated or hashed build), which names a moving build rather than a release.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/stockfish-dev-20261028-ff7cee42","marketAround":{"before":{"day":"2026-10-27","priceUsd":0.000003506857255,"marketCapUsd":3506.857255,"marketCapKind":"fdv"},"after":{"day":"2026-10-31","priceUsd":0.000003337071994,"marketCapUsd":3337.071994,"marketCapKind":"fdv"}}},{"id":"ship:4f3a4251-3b97-4f19-a058-4a1f4da686b0","kind":"code","at":"2026-10-28T05:14:06.000Z","precision":"WEEK","title":"Code changes, week of 2026-10-26 – 2026-11-01","summary":"1 active day in official-stockfish/stockfish.","recordedAt":"2026-10-28T23:12:09.797Z","discoveryLagHours":18,"eventType":"CODE_ACTIVITY","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","codeSubstance":{"verdict":"UNKNOWN","classifierVersion":"commit-substance-v4","countsAsBuilding":true,"commitsListed":3,"commitsRead":0,"changedCode":0,"documentationOrMaintenance":0,"substanceUnknown":0,"notRead":3,"files":{"source":0,"test":0,"docs":0,"readme":0,"dependency":0,"config":0,"ci":0,"generated":0,"asset":0,"whitespace":0,"rename":0,"data":0,"unknown":0},"weekFullyListed":true,"automatedCommits":0,"sampled":false,"basis":null,"summary":"HEY has not yet looked inside 3 commits from this week."},"source":"https://github.com/official-stockfish/stockfish","marketAround":{"before":{"day":"2026-10-27","priceUsd":0.000003506857255,"marketCapUsd":3506.857255,"marketCapKind":"fdv"},"after":{"day":"2026-10-31","priceUsd":0.000003337071994,"marketCapUsd":3337.071994,"marketCapKind":"fdv"}}},{"id":"ship:b118f656-5ff4-41c5-bb87-d0023dda5773","kind":"release","at":"2026-10-25T21:10:25.000Z","precision":"EXACT","title":"Stockfish dev-20261025-ff3a6c50","summary":"Precompiled binaries of the latest Stockfish development version, built automatically on every commit. > [!NOTE] > For stable, thoroughly tested builds use the [official releases](https://github.com/official-stockfish/Stockfish/releases). > Pre-releases may contain bugs. *Some platforms ship a **universal binary** that automatically selects the best instruction set for your CPU - no manual selection needed.* --- ## Commits - [`ff3a6c50`](https://github.com/official-stockfish/Stockfish/commit/ff3a6c508ed731f0dcf253f4ddf646df19a62f84) *21 bit tt keys with SWAR* - [`20eab0ba`](https://github.com/","recordedAt":"2026-10-25T23:09:51.621Z","discoveryLagHours":2,"eventType":"GITHUB_RELEASE","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"rolling_tag","contextWords":"Recorded, not counted: it was cut from a rolling tag (latest, nightly, a dated or hashed build), which names a moving build rather than a release.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/stockfish-dev-20261025-ff3a6c50","marketAround":{"before":{"day":"2026-10-24","priceUsd":0.000003506857255,"marketCapUsd":3506.857255,"marketCapKind":"fdv"},"after":{"day":"2026-10-28","priceUsd":0.000003506857255,"marketCapUsd":3506.857255,"marketCapKind":"fdv"}}},{"id":"ship:f324347e-5fa2-4323-9683-54632ea0f5da","kind":"code","at":"2026-10-25T20:13:40.000Z","precision":"WEEK","title":"Code changes, week of 2026-10-19 – 2026-10-25","summary":"2 active days in official-stockfish/stockfish.","recordedAt":"2026-10-25T23:09:51.852Z","discoveryLagHours":2.9,"eventType":"CODE_ACTIVITY","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","codeSubstance":{"verdict":"UNKNOWN","classifierVersion":"commit-substance-v4","countsAsBuilding":true,"commitsListed":16,"commitsRead":0,"changedCode":0,"documentationOrMaintenance":0,"substanceUnknown":0,"notRead":16,"files":{"source":0,"test":0,"docs":0,"readme":0,"dependency":0,"config":0,"ci":0,"generated":0,"asset":0,"whitespace":0,"rename":0,"data":0,"unknown":0},"weekFullyListed":true,"automatedCommits":0,"sampled":false,"basis":null,"summary":"HEY has not yet looked inside 16 commits from this week."},"source":"https://github.com/official-stockfish/stockfish","marketAround":{"before":{"day":"2026-10-24","priceUsd":0.000003506857255,"marketCapUsd":3506.857255,"marketCapKind":"fdv"},"after":{"day":"2026-10-28","priceUsd":0.000003506857255,"marketCapUsd":3506.857255,"marketCapKind":"fdv"}}},{"id":"ship:656863e9-021c-4931-ac1f-92df2882f181","kind":"release","at":"2026-10-17T12:17:29.000Z","precision":"EXACT","title":"Stockfish dev-20261017-effdc3fd","summary":"Precompiled binaries of the latest Stockfish development version, built automatically on every commit. > [!NOTE] > For stable, thoroughly tested builds use the [official releases](https://github.com/official-stockfish/Stockfish/releases). > Pre-releases may contain bugs. *Some platforms ship a **universal binary** that automatically selects the best instruction set for your CPU - no manual selection needed.* --- ## Commits - [`effdc3fd`](https://github.com/official-stockfish/Stockfish/commit/effdc3fd3f6de6e75fe1374a51a7a7eed66f880b) *Refactor totBestMoveChanges calculation* - [`b877fbde`](http","recordedAt":"2026-10-19T22:55:34.348Z","discoveryLagHours":58.6,"eventType":"GITHUB_RELEASE","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"rolling_tag","contextWords":"Recorded, not counted: it was cut from a rolling tag (latest, nightly, a dated or hashed build), which names a moving build rather than a release.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/stockfish-dev-20261017-effdc3fd","marketAround":{"before":{"day":"2026-10-16","priceUsd":0.000003633814734,"marketCapUsd":3633.814734,"marketCapKind":"fdv"},"after":{"day":"2026-10-20","priceUsd":0.000003450388729,"marketCapUsd":3450.388729,"marketCapKind":"fdv"}}},{"id":"ship:75d8b3bc-9d81-4434-94f9-e9b6bc7ecdd6","kind":"code","at":"2026-10-17T11:25:09.000Z","precision":"WEEK","title":"Code changes, week of 2026-10-12 – 2026-10-18","summary":"2 active days in official-stockfish/stockfish.","recordedAt":"2026-10-13T22:42:22.991Z","eventType":"CODE_ACTIVITY","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","codeSubstance":{"verdict":"UNKNOWN","classifierVersion":"commit-substance-v4","countsAsBuilding":true,"commitsListed":5,"commitsRead":0,"changedCode":0,"documentationOrMaintenance":0,"substanceUnknown":0,"notRead":5,"files":{"source":0,"test":0,"docs":0,"readme":0,"dependency":0,"config":0,"ci":0,"generated":0,"asset":0,"whitespace":0,"rename":0,"data":0,"unknown":0},"weekFullyListed":true,"automatedCommits":0,"sampled":false,"basis":null,"summary":"HEY has not yet looked inside 5 commits from this week."},"source":"https://github.com/official-stockfish/stockfish","marketAround":{"before":{"day":"2026-10-16","priceUsd":0.000003633814734,"marketCapUsd":3633.814734,"marketCapKind":"fdv"},"after":{"day":"2026-10-20","priceUsd":0.000003450388729,"marketCapUsd":3450.388729,"marketCapKind":"fdv"}}},{"id":"ship:e931073b-7e0f-476d-beaf-9fe724a76a21","kind":"release","at":"2026-10-13T17:16:04.000Z","precision":"EXACT","title":"Stockfish dev-20261013-5c4cef0b","summary":"Precompiled binaries of the latest Stockfish development version, built automatically on every commit. > [!NOTE] > For stable, thoroughly tested builds use the [official releases](https://github.com/official-stockfish/Stockfish/releases). > Pre-releases may contain bugs. *Some platforms ship a **universal binary** that automatically selects the best instruction set for your CPU - no manual selection needed.* --- ## Commits - [`5c4cef0b`](https://github.com/official-stockfish/Stockfish/commit/5c4cef0bfe61fb3249178b2bcf21f5673557efe7) *Update NNUE architecture to SFNNv18 and net nn-c9e480e92425.","recordedAt":"2026-10-13T22:42:22.903Z","discoveryLagHours":5.4,"eventType":"GITHUB_RELEASE","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"rolling_tag","contextWords":"Recorded, not counted: it was cut from a rolling tag (latest, nightly, a dated or hashed build), which names a moving build rather than a release.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/stockfish-dev-20261013-5c4cef0b","marketAround":{"before":{"day":"2026-10-12","priceUsd":0.000004020888293,"marketCapUsd":4020.888293,"marketCapKind":"fdv"},"after":{"day":"2026-10-16","priceUsd":0.000003633814734,"marketCapUsd":3633.814734,"marketCapKind":"fdv"}}},{"id":"ship:5ecf468c-9c5b-4b57-ad09-ce1812177b85","kind":"code","at":"2026-10-10T13:40:41.000Z","precision":"WEEK","title":"Code changes, week of 2026-10-05 – 2026-10-11","summary":"1 active day in official-stockfish/stockfish.","recordedAt":"2026-10-10T22:38:56.572Z","discoveryLagHours":9,"eventType":"CODE_ACTIVITY","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","codeSubstance":{"verdict":"UNKNOWN","classifierVersion":"commit-substance-v4","countsAsBuilding":true,"commitsListed":9,"commitsRead":0,"changedCode":0,"documentationOrMaintenance":0,"substanceUnknown":0,"notRead":9,"files":{"source":0,"test":0,"docs":0,"readme":0,"dependency":0,"config":0,"ci":0,"generated":0,"asset":0,"whitespace":0,"rename":0,"data":0,"unknown":0},"weekFullyListed":true,"automatedCommits":0,"sampled":false,"basis":null,"summary":"HEY has not yet looked inside 9 commits from this week."},"source":"https://github.com/official-stockfish/stockfish","marketAround":{"before":{"day":"2026-10-09","priceUsd":0.000004020888293,"marketCapUsd":4020.888293,"marketCapKind":"fdv"},"after":{"day":"2026-10-13","priceUsd":0.000004020888293,"marketCapUsd":4020.888293,"marketCapKind":"fdv"}}},{"id":"ship:157b8ba1-bae7-48a0-bd5d-fb76907fec80","kind":"release","at":"2026-09-30T19:32:32.000Z","precision":"EXACT","title":"Stockfish dev-20260930-49ea5ded","summary":"Precompiled binaries of the latest Stockfish development version, built automatically on every commit. > [!NOTE] > For stable, thoroughly tested builds use the [official releases](https://github.com/official-stockfish/Stockfish/releases). > Pre-releases may contain bugs. *Some platforms ship a **universal binary** that automatically selects the best instruction set for your CPU - no manual selection needed.* --- ## Commits - [`49ea5ded`](https://github.com/official-stockfish/Stockfish/commit/49ea5ded38315cff8e67f4a677a9e7811612fbf6) *Simplify singularDepth from the bonus formula* - [`af68fea3`","recordedAt":"2026-10-07T22:26:37.016Z","discoveryLagHours":170.9,"eventType":"GITHUB_RELEASE","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"rolling_tag","contextWords":"Recorded, not counted: it was cut from a rolling tag (latest, nightly, a dated or hashed build), which names a moving build rather than a release.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/stockfish-dev-20260930-49ea5ded","marketAround":{"before":{"day":"2026-09-29","priceUsd":0.000003865339954,"marketCapUsd":3865.339954,"marketCapKind":"fdv"},"after":{"day":"2026-10-03","priceUsd":0.000004046,"marketCapUsd":3569}}},{"id":"ship:c0f96f29-d9ac-4be0-b0c4-5a0eb6b07bc0","kind":"code","at":"2026-09-30T18:43:50.000Z","precision":"WEEK","title":"Code changes, week of 2026-09-28 – 2026-10-04","summary":"1 active day in official-stockfish/stockfish.","recordedAt":"2026-10-07T22:26:37.180Z","discoveryLagHours":171.7,"eventType":"CODE_ACTIVITY","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","codeSubstance":{"verdict":"UNKNOWN","classifierVersion":"commit-substance-v4","countsAsBuilding":true,"commitsListed":7,"commitsRead":0,"changedCode":0,"documentationOrMaintenance":0,"substanceUnknown":0,"notRead":7,"files":{"source":0,"test":0,"docs":0,"readme":0,"dependency":0,"config":0,"ci":0,"generated":0,"asset":0,"whitespace":0,"rename":0,"data":0,"unknown":0},"weekFullyListed":true,"automatedCommits":0,"sampled":false,"basis":null,"summary":"HEY has not yet looked inside 7 commits from this week."},"source":"https://github.com/official-stockfish/stockfish","marketAround":{"before":{"day":"2026-09-29","priceUsd":0.000003865339954,"marketCapUsd":3865.339954,"marketCapKind":"fdv"},"after":{"day":"2026-10-03","priceUsd":0.000004046,"marketCapUsd":3569}}},{"id":"ship:0679789f-76e1-42fe-ada8-3fe905ed1f1e","kind":"release","at":"2026-09-22T16:55:18.000Z","precision":"EXACT","title":"Stockfish dev-20260922-0a215d6c","summary":"Precompiled binaries of the latest Stockfish development version, built automatically on every commit. > [!NOTE] > For stable, thoroughly tested builds use the [official releases](https://github.com/official-stockfish/Stockfish/releases). > Pre-releases may contain bugs. *Some platforms ship a **universal binary** that automatically selects the best instruction set for your CPU - no manual selection needed.* --- ## Commits - [`0a215d6c`](https://github.com/official-stockfish/Stockfish/commit/0a215d6c9e48856ef630013b8ab8312941a59057) *Miscellaneous cleanups September 2026* - [`f740707f`](https:","recordedAt":"2026-09-24T09:35:14.685Z","discoveryLagHours":40.7,"eventType":"GITHUB_RELEASE","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"rolling_tag","contextWords":"Recorded, not counted: it was cut from a rolling tag (latest, nightly, a dated or hashed build), which names a moving build rather than a release.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/stockfish-dev-20260922-0a215d6c","marketAround":{"before":{"day":"2026-09-21","priceUsd":0.000003861,"marketCapUsd":3406},"after":{"day":"2026-09-25","priceUsd":0.000003973,"marketCapUsd":3505}}},{"id":"ship:6cc1741b-302d-4cf9-977b-1d0b9e2bae2c","kind":"code","at":"2026-09-22T16:05:37.000Z","precision":"WEEK","title":"Code changes, week of 2026-09-21 – 2026-09-27","summary":"1 active day in official-stockfish/stockfish.","recordedAt":"2026-09-24T09:35:14.759Z","discoveryLagHours":41.5,"eventType":"CODE_ACTIVITY","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","codeSubstance":{"verdict":"UNKNOWN","classifierVersion":"commit-substance-v4","countsAsBuilding":true,"commitsListed":8,"commitsRead":0,"changedCode":0,"documentationOrMaintenance":0,"substanceUnknown":0,"notRead":8,"files":{"source":0,"test":0,"docs":0,"readme":0,"dependency":0,"config":0,"ci":0,"generated":0,"asset":0,"whitespace":0,"rename":0,"data":0,"unknown":0},"weekFullyListed":true,"automatedCommits":0,"sampled":false,"basis":null,"summary":"HEY has not yet looked inside 8 commits from this week."},"source":"https://github.com/official-stockfish/stockfish","marketAround":{"before":{"day":"2026-09-21","priceUsd":0.000003861,"marketCapUsd":3406},"after":{"day":"2026-09-25","priceUsd":0.000003973,"marketCapUsd":3505}}},{"id":"ship:0abd007e-9a81-4430-928e-9a03b3d50470","kind":"release","at":"2026-09-19T11:27:28.000Z","precision":"EXACT","title":"Stockfish dev-20260919-17a6c8f1","summary":"Precompiled binaries of the latest Stockfish development version, built automatically on every commit. > [!NOTE] > For stable, thoroughly tested builds use the [official releases](https://github.com/official-stockfish/Stockfish/releases). > Pre-releases may contain bugs. *Some platforms ship a **universal binary** that automatically selects the best instruction set for your CPU - no manual selection needed.* --- ## Commits - [`17a6c8f1`](https://github.com/official-stockfish/Stockfish/commit/17a6c8f1eb0da45c2ca405321919519bf4e211ba) *CI: Update Compiler Images (#7175)* [View all commits →](htt","recordedAt":"2026-09-19T14:02:44.020Z","discoveryLagHours":2.6,"eventType":"GITHUB_RELEASE","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"rolling_tag","contextWords":"Recorded, not counted: it was cut from a rolling tag (latest, nightly, a dated or hashed build), which names a moving build rather than a release.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/stockfish-dev-20260919-17a6c8f1","marketAround":{"before":{"day":"2026-09-18","priceUsd":0.000004096,"marketCapUsd":3613},"after":{"day":"2026-09-22","priceUsd":0.000003900220959,"marketCapUsd":3900.220959,"marketCapKind":"fdv"}}},{"id":"ship:7b0666a6-50d3-4411-b8d7-21e6c858117d","kind":"code","at":"2026-09-19T10:43:30.000Z","precision":"WEEK","title":"Code changes, week of 2026-09-14 – 2026-09-20","summary":"2 active days in official-stockfish/stockfish.","recordedAt":"2026-09-19T04:09:34.331Z","eventType":"CODE_ACTIVITY","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","codeSubstance":{"verdict":"UNKNOWN","classifierVersion":"commit-substance-v4","countsAsBuilding":true,"commitsListed":7,"commitsRead":0,"changedCode":0,"documentationOrMaintenance":0,"substanceUnknown":0,"notRead":7,"files":{"source":0,"test":0,"docs":0,"readme":0,"dependency":0,"config":0,"ci":0,"generated":0,"asset":0,"whitespace":0,"rename":0,"data":0,"unknown":0},"weekFullyListed":false,"automatedCommits":0,"sampled":false,"basis":null,"summary":"HEY has not yet looked inside 7 commits from this week."},"source":"https://github.com/official-stockfish/stockfish","marketAround":{"before":{"day":"2026-09-18","priceUsd":0.000004096,"marketCapUsd":3613},"after":{"day":"2026-09-22","priceUsd":0.000003900220959,"marketCapUsd":3900.220959,"marketCapKind":"fdv"}}},{"id":"ship:f9d31895-92a1-4d8e-8e36-acda79a72632","kind":"code","at":"2026-09-13T23:59:00.000Z","precision":"WEEK","title":"Code changes, week of 2026-09-07 – 2026-09-13","summary":"2 active days in official-stockfish/stockfish.","recordedAt":"2026-09-18T16:15:29.846Z","eventType":"CODE_ACTIVITY","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","codeSubstance":{"verdict":"UNKNOWN","classifierVersion":"commit-substance-v4","countsAsBuilding":true,"commitsListed":19,"commitsRead":0,"changedCode":0,"documentationOrMaintenance":0,"substanceUnknown":0,"notRead":19,"files":{"source":0,"test":0,"docs":0,"readme":0,"dependency":0,"config":0,"ci":0,"generated":0,"asset":0,"whitespace":0,"rename":0,"data":0,"unknown":0},"weekFullyListed":false,"automatedCommits":0,"sampled":false,"basis":null,"summary":"HEY has not yet looked inside 19 commits from this week."},"source":"https://github.com/official-stockfish/stockfish","marketAround":{"after":{"day":"2026-09-16","priceUsd":0.000003821,"marketCapUsd":3371}}},{"id":"ship:ea812f7d-cbd0-4fa7-8e16-d36fc072bf29","kind":"release","at":"2026-09-13T08:15:13.000Z","precision":"EXACT","title":"Stockfish dev-20260913-031dfeb4","summary":"Precompiled binaries of the latest Stockfish development version, built automatically on every commit. > [!NOTE] > For stable, thoroughly tested builds use the [official releases](https://github.com/official-stockfish/Stockfish/releases). > Pre-releases may contain bugs. *Some platforms ship a **universal binary** that automatically selects the best instruction set for your CPU - no manual selection needed.* --- ## Commits - [`031dfeb4`](https://github.com/official-stockfish/Stockfish/commit/031dfeb437fa6b06cdbdf4ef89dfb82f6b83c4d3) *Remove unused constexpr_lsb and lsb_index64* - [`86433ca7`](","recordedAt":"2026-09-15T04:14:17.571Z","eventType":"GITHUB_RELEASE","verification":"SOURCE_LINKED","countsAsBuilding":false,"contextReason":"rolling_tag","contextWords":"Recorded, not counted: it was cut from a rolling tag (latest, nightly, a dated or hashed build), which names a moving build rather than a release.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/stockfish-dev-20260913-031dfeb4","marketAround":{"after":{"day":"2026-09-16","priceUsd":0.000003821,"marketCapUsd":3371}}},{"id":"ship:641e7faa-2134-43b2-a783-89d192dcf0ba","kind":"release","at":"2026-09-05T08:33:17.000Z","precision":"EXACT","title":"Stockfish 19","summary":"Today, we have the pleasure of announcing **Stockfish 19**, a new major release. As always, you can freely download it at [stockfishchess.org/download][1] and use it as a drop-in replacement in the [GUI of your choice][2] to benefit from stronger play and more accurate analysis. Whether you can spare hours or days of CPU time, your help matters for the ongoing development of Stockfish. Find out how you can contribute at [stockfishchess.org/get-involved][3]. Join our [Discord server][4] to get in touch with the community of developers and users of the project! ## Quality of Chess Play In tests","recordedAt":"2026-09-15T04:14:17.578Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_19","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:ff49d5a2-a1f8-4fc4-95ff-23f8323e7217","kind":"release","at":"2026-01-31T14:33:53.000Z","precision":"EXACT","title":"Stockfish 18","summary":"Today, we have the pleasure of announcing **Stockfish 18**, a new major release. As always, you can freely download it at [stockfishchess.org/download][1] and use it as a drop-in replacement in the [GUI of your choice][2] to benefit from stronger play and more accurate analysis. Whether you can spare hours or days of CPU time, your help matters for the ongoing development of Stockfish. Find out how you can help at [stockfishchess.org/get-involved][3]. Join our [Discord server][4] to get in touch with the community of developers and users of the project! ## Quality of chess play In tests agains","recordedAt":"2026-09-15T04:14:17.583Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_18","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:e51d7e02-b03f-466b-a0d9-ef8146829b8d","kind":"release","at":"2025-03-30T12:13:16.000Z","precision":"EXACT","title":"Stockfish 17.1","summary":"Today, we have the pleasure to announce Stockfish 17.1. As always, you can **freely** download it at [stockfishchess.org/download][1] and use it in the [GUI of your choice][2]. Join our [Discord server][3] to get in touch with the community of developers and users of the project! ## Quality of chess play In our testing against its predecessor, Stockfish 17.1 shows a consistent improvement in performance, with an [Elo gain of up to 20 points][4] and winning close to 2 times more game pairs than it loses. ## Update highlights ### New speedtest command The new `speedtest` command benchmarks your","recordedAt":"2026-09-15T04:14:17.589Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_17.1","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:d4d31167-2450-4ae3-991c-245ad1ac0206","kind":"release","at":"2024-09-06T16:29:13.000Z","precision":"EXACT","title":"Stockfish 17","summary":"Today we have the pleasure to announce a new major release of Stockfish. As always, you can freely download it at [stockfishchess.org/download](https://stockfishchess.org/download) and use it in the GUI of your choice. Don’t forget to join our [Discord server][1] to get in touch with the community of developers and users of the project! ## Quality of chess play In tests against Stockfish 16, this release brings an Elo gain of [up to 46 points][2] and wins [up to 4.5 times more game pairs][3] than it loses. In practice, high-quality moves are now found in less time, with a user upgrading from S","recordedAt":"2026-09-15T04:14:17.594Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_17","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:7e40a849-deb9-4e8b-b0d7-2b1ec3cb05eb","kind":"release","at":"2024-02-24T17:18:38.000Z","precision":"EXACT","title":"Stockfish 16.1","summary":"Today, we have the pleasure to announce Stockfish 16.1. As always, you can **freely** download it at [stockfishchess.org/download](<https://stockfishchess.org/download>) and use it in the [GUI of your choice](<https://github.com/official-stockfish/Stockfish/wiki/Download-and-usage#download-a-chess-gui>). Don't forget to join our [Discord server](<https://discord.gg/GWDRS3kU6R>) to get in touch with the community of developers and users of the project! ## Quality of chess play In our testing against its predecessor, Stockfish 16.1 shows a notable improvement in performance, with an [**Elo gain*","recordedAt":"2026-09-15T04:14:17.599Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_16.1","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:22271f96-cc0d-465c-9809-4d5c54aaebf9","kind":"release","at":"2023-06-30T19:16:09.000Z","precision":"EXACT","title":"Stockfish 16","summary":"A new major release of Stockfish is now available at [stockfishchess.org/download](http://stockfishchess.org/download) ## Quality of chess play Stockfish continues to demonstrate its ability to discover superior moves with remarkable speed. In self-play against Stockfish 15, this new release [gains up to 50 Elo](https://tests.stockfishchess.org/tests/view/649409f0dc7002ce609c99cc) and [wins up to 12 times more game pairs](https://tests.stockfishchess.org/tests/view/649409d7dc7002ce609c99c6) than it loses. In major chess engine tournaments, Stockfish [reliably tops the rankings](https://en.wiki","recordedAt":"2026-09-15T04:14:17.603Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_16","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:9be6d591-8bef-4b7c-86b3-b73a21096873","kind":"release","at":"2022-12-04T20:35:04.000Z","precision":"EXACT","title":"Stockfish 15.1","summary":"Today, we have the pleasure to announce Stockfish 15.1. As usual, downloads will be freely available at [stockfishchess.org/download](http://stockfishchess.org/download) ## Elo gain and competition results With this release, version 5 of the NNUE neural net architecture has been introduced, and the training data has been extended to include Fischer random chess (FRC) positions. As a result, Elo gains are largest for FRC, [reaching up to 50 Elo for doubly randomized FRC](https://tests.stockfishchess.org/tests/view/638a6170d2b9c924c4c62cb4) (DFRC). More importantly, also for standard chess this","recordedAt":"2026-09-15T04:14:17.607Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_15.1","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:06978cf2-1b30-420c-a29e-3e4070ef212c","kind":"release","at":"2022-04-18T20:49:29.000Z","precision":"EXACT","title":"Stockfish 15","summary":"A new major release of Stockfish is now available at[ https://stockfishchess.org](https://stockfishchess.org/) Stockfish 15 continues to push the boundaries of chess, providing unrivalled analysis and playing strength. In our testing, Stockfish 15 is ahead of Stockfish 14 by 36 Elo points and wins nine times more game pairs than it loses[1]. Improvements to the engine have made it possible for Stockfish to end up victorious in tournaments at all sorts of time controls ranging from bullet to classical and even at Fischer random chess[2]. At CCC, Stockfish won all of the latest tournaments: CCC","recordedAt":"2026-09-15T04:14:17.611Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_15","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:ee937820-88ab-4f05-b7bc-ad1f67d899c9","kind":"release","at":"2021-10-28T08:48:18.000Z","precision":"EXACT","title":"Stockfish 14.1","summary":"Today, we have the pleasure to announce Stockfish 14.1. As usual, downloads will be freely available at stockfishchess.org/download [1]. With Stockfish 14.1 our users get access to the strongest chess engine available today. In the period leading up to this release, Stockfish convincingly won several chess engine tournaments, including the TCEC 21 superfinal, the TCEC Cup 9, and the Computer Chess Championship for Fischer Random Chess (Chess960). In the latter tournament, Stockfish was undefeated in 599 out of 600 games played. Compared to Stockfish 14, this release introduces a more advanced","recordedAt":"2026-09-15T04:14:17.615Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_14.1","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:e8a0c71b-cf28-4634-8366-0ace83f2320e","kind":"release","at":"2021-07-02T17:59:15.000Z","precision":"EXACT","title":"Stockfish 14","summary":"Today, we have the pleasure to announce Stockfish 14. As usual, downloads will be freely available at https://stockfishchess.org The engine is now significantly stronger than just a few months ago, and wins four times more game pairs than it loses against the previous release version [0]. Stockfish 14 is now at least 400 Elo ahead of Stockfish 7, a top engine in 2016[1]. During the last five years, Stockfish has thus gained about 80 Elo per year. Stockfish 14 evaluates positions more accurately than Stockfish 13 as a result of two major steps forward in defining and training the efficiently up","recordedAt":"2026-09-15T04:14:17.619Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_14","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:be180799-e894-4f98-b9ff-719587df5f39","kind":"release","at":"2021-02-19T17:31:52.000Z","precision":"EXACT","title":"Stockfish 13","summary":"It is our pleasure to release Stockfish 13 to chess fans worldwide. As usual, downloads are freely available at https://stockfishchess.org The Stockfish project builds on a thriving community of enthusiasts who contribute their expertise, time, and resources to build a free and open-source chess engine that is robust, widely available, and very strong. We would like to thank them all! The good news first: from now on, our users can expect more frequent high-quality releases of Stockfish! Sadly, this decision has been triggered by the start of sales of the Fat Fritz 2 engine by ChessBase, which","recordedAt":"2026-09-15T04:14:17.624Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_13","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:b98cb974-46e4-4f92-a6b3-c5515c9938a0","kind":"release","at":"2020-09-02T14:28:11.000Z","precision":"EXACT","title":"Stockfish 12","summary":"It is our pleasure to release Stockfish 12 to users world-wide Downloads will be freely available at https://stockfishchess.org/download/ This version 12 of Stockfish plays significantly stronger than any of its predecessors. In a match against Stockfish 11, Stockfish 12 will typically win at least ten times more game pairs than it loses. This jump in strength, visible in regular progression tests during development[1], results from the introduction of an efficiently updatable neural network (NNUE) for the evaluation in Stockfish[2], and associated tuning of the engine as a whole. The concept","recordedAt":"2026-09-15T04:14:17.629Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_12","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:d537113b-6bdf-4990-9c48-6c48ad96ba32","kind":"release","at":"2020-01-18T01:39:24.000Z","precision":"EXACT","title":"Stockfish 11","summary":"Official release version of Stockfish 11. Bench: 5156767 Release notes: https://github.com/official-stockfish/Stockfish/commit/c3483fa9a7d7c0ffa9fcc32b467ca844cfb63790","recordedAt":"2026-09-15T04:14:17.634Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_11","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:09318304-f70b-4348-94f5-744584e5012a","kind":"release","at":"2018-11-29T15:12:36.000Z","precision":"EXACT","title":"Stockfish 10","summary":"Official release version of Stockfish 10. [**Source code** (zip)](https://github.com/official-stockfish/Stockfish/files/2629649/sf_10.zip) [**Source code** (tar.gz)](https://github.com/official-stockfish/Stockfish/files/2629657/sf_10.tar.gz) This is also the 10th anniversary version of the Stockfish project, which started exactly ten years ago! I wish to extend a huge thank you to all contributors and authors in our amazing community :-) Bench: 3939338","recordedAt":"2026-09-15T04:14:17.639Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_10","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:fcb63ade-5b08-4ed0-bf0c-2affcdab1eb8","kind":"release","at":"2018-02-01T14:35:13.000Z","precision":"EXACT","title":"Stockfish 9","recordedAt":"2026-09-15T04:14:17.643Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_9","marketAround":{"after":{"day":"2026-09-13"}}},{"id":"ship:7a22fb53-573c-45bf-8d1a-70ad532f28fc","kind":"release","at":"2016-01-05T14:24:05.000Z","precision":"EXACT","title":"sf_7","recordedAt":"2026-09-15T04:14:17.649Z","eventType":"GITHUB_RELEASE","verification":"PUBLICLY_VERIFIED","countsAsBuilding":false,"contextReason":"source:repo_not_corroborated","contextWords":"Recorded, not counted: it was read from a source HEY holds only as context, and that source says why under Sources.","source":"https://github.com/official-stockfish/Stockfish/releases/tag/sf_7","marketAround":{"after":{"day":"2026-09-13"}}}],"totals":{"ships":32,"contractSource":0,"locks":0,"resumed":0,"marketIntegrity":0,"verification":0},"total":32,"truncated":false,"nextCursor":null,"disclaimer":"Public, source-backed activity HEY recorded. Still Building means counted ships during a market drawdown HEY itself tracked — it is not a prediction, not a ranking by price, and not investment advice. Few projects meet Still Building or Under the Radar at any time; both are strict by design, and list responses carry the counts."}