{"action":"created","issue":{"url":"https://api.github.com/repos/official-stockfish/Stockfish/issues/282","labels_url":"https://api.github.com/repos/official-stockfish/Stockfish/issues/282/labels{/name}","comments_url":"https://api.github.com/repos/official-stockfish/Stockfish/issues/282/comments","events_url":"https://api.github.com/repos/official-stockfish/Stockfish/issues/282/events","html_url":"https://github.com/official-stockfish/Stockfish/pull/282","id":60302654,"number":282,"title":"Counter move history","user":{"login":"locutus2","id":953505,"avatar_url":"https://avatars.githubusercontent.com/u/953505?v=3","gravatar_id":"","url":"https://api.github.com/users/locutus2","html_url":"https://github.com/locutus2","followers_url":"https://api.github.com/users/locutus2/followers","following_url":"https://api.github.com/users/locutus2/following{/other_user}","gists_url":"https://api.github.com/users/locutus2/gists{/gist_id}","starred_url":"https://api.github.com/users/locutus2/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/locutus2/subscriptions","organizations_url":"https://api.github.com/users/locutus2/orgs","repos_url":"https://api.github.com/users/locutus2/repos","events_url":"https://api.github.com/users/locutus2/events{/privacy}","received_events_url":"https://api.github.com/users/locutus2/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":8,"created_at":"2015-03-09T06:05:28Z","updated_at":"2015-03-10T11:55:20Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/official-stockfish/Stockfish/pulls/282","html_url":"https://github.com/official-stockfish/Stockfish/pull/282","diff_url":"https://github.com/official-stockfish/Stockfish/pull/282.diff","patch_url":"https://github.com/official-stockfish/Stockfish/pull/282.patch"},"body":"Introduce a counter move history table which additionally is indexed by the last move's piece and target square.\r\nFor quiet move ordering use now the sum of standard and counter move history table.\r\n\r\nSTC:\r\nLLR: 2.96 (-2.94,2.94) [-1.50,4.50]\r\nTotal: 4747 W: 1005 L: 885 D: 2857\r\n\r\nLTC:\r\nLLR: 2.95 (-2.94,2.94) [0.00,6.00]\r\nTotal: 5726 W: 1001 L: 872 D: 3853\r\n\r\nBecause of reported low NPS on multi core test\r\nSTC (7 threads):\r\nELO: 7.26 +-3.3 (95%) LOS: 100.0%\r\nTotal: 14937 W: 2710 L: 2398 D: 9829\r\n\r\nBench: 7725341"},"comment":{"url":"https://api.github.com/repos/official-stockfish/Stockfish/issues/comments/78039619","html_url":"https://github.com/official-stockfish/Stockfish/pull/282#issuecomment-78039619","issue_url":"https://api.github.com/repos/official-stockfish/Stockfish/issues/282","id":78039619,"user":{"login":"locutus2","id":953505,"avatar_url":"https://avatars.githubusercontent.com/u/953505?v=3","gravatar_id":"","url":"https://api.github.com/users/locutus2","html_url":"https://github.com/locutus2","followers_url":"https://api.github.com/users/locutus2/followers","following_url":"https://api.github.com/users/locutus2/following{/other_user}","gists_url":"https://api.github.com/users/locutus2/gists{/gist_id}","starred_url":"https://api.github.com/users/locutus2/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/locutus2/subscriptions","organizations_url":"https://api.github.com/users/locutus2/orgs","repos_url":"https://api.github.com/users/locutus2/repos","events_url":"https://api.github.com/users/locutus2/events{/privacy}","received_events_url":"https://api.github.com/users/locutus2/received_events","type":"User","site_admin":false},"created_at":"2015-03-10T11:55:20Z","updated_at":"2015-03-10T11:55:20Z","body":"I have tested the simplified version which i commited (commit  9d01178) to this branch (test) against my original one (commit  2d4591c) (which passed SPRT)  (base) with fishbench.\r\n\r\nThe simplified version shows for me a NPS slowdown of 3,5%!\r\n\r\ncan someone other measure this slowdown?\r\n\r\n(Windows 7 64-bit, i5-2500 CPU @ 3.30 GHz, mingw 4.8.1 (64-bit))\r\nResults for 89 tests for each version:\r\n\r\n            Base      Test      Diff      \r\n    Mean    2065664   1993562   72102     \r\n    StDev   26057     23669     5898      \r\n\r\np-value: 0\r\nspeedup: -0,035"}}