{"action":"created","issue":{"url":"https://api.github.com/repos/ddugovic/Stockfish/issues/70","repository_url":"https://api.github.com/repos/ddugovic/Stockfish","labels_url":"https://api.github.com/repos/ddugovic/Stockfish/issues/70/labels{/name}","comments_url":"https://api.github.com/repos/ddugovic/Stockfish/issues/70/comments","events_url":"https://api.github.com/repos/ddugovic/Stockfish/issues/70/events","html_url":"https://github.com/ddugovic/Stockfish/issues/70","id":183751799,"number":70,"title":"Antichess qsearch","user":{"login":"ianfab","id":12969303,"avatar_url":"https://avatars.githubusercontent.com/u/12969303?v=3","gravatar_id":"","url":"https://api.github.com/users/ianfab","html_url":"https://github.com/ianfab","followers_url":"https://api.github.com/users/ianfab/followers","following_url":"https://api.github.com/users/ianfab/following{/other_user}","gists_url":"https://api.github.com/users/ianfab/gists{/gist_id}","starred_url":"https://api.github.com/users/ianfab/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ianfab/subscriptions","organizations_url":"https://api.github.com/users/ianfab/orgs","repos_url":"https://api.github.com/users/ianfab/repos","events_url":"https://api.github.com/users/ianfab/events{/privacy}","received_events_url":"https://api.github.com/users/ianfab/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2016-10-18T17:26:43Z","updated_at":"2016-10-18T23:19:19Z","closed_at":null,"body":"If I am not mistaken, no qsearch is performed for antichess. Since there are no checks and since promotions are quiet moves in antichess, only captures are generated in qsearch. However, all captures have negative SEE (at least with the current SEE) due to negative piece values, so all captures are SEE pruned. This would mean that there no moves left to do a qsearch.\r\n\r\nSo what is qsearch supposed to do in antichess? I think it is difficult to determine which captures should be searched. Are there any rules of thumb which captures are good or bad in antichess?"},"comment":{"url":"https://api.github.com/repos/ddugovic/Stockfish/issues/comments/254667074","html_url":"https://github.com/ddugovic/Stockfish/issues/70#issuecomment-254667074","issue_url":"https://api.github.com/repos/ddugovic/Stockfish/issues/70","id":254667074,"user":{"login":"ddugovic","id":1834123,"avatar_url":"https://avatars.githubusercontent.com/u/1834123?v=3","gravatar_id":"","url":"https://api.github.com/users/ddugovic","html_url":"https://github.com/ddugovic","followers_url":"https://api.github.com/users/ddugovic/followers","following_url":"https://api.github.com/users/ddugovic/following{/other_user}","gists_url":"https://api.github.com/users/ddugovic/gists{/gist_id}","starred_url":"https://api.github.com/users/ddugovic/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ddugovic/subscriptions","organizations_url":"https://api.github.com/users/ddugovic/orgs","repos_url":"https://api.github.com/users/ddugovic/repos","events_url":"https://api.github.com/users/ddugovic/events{/privacy}","received_events_url":"https://api.github.com/users/ddugovic/received_events","type":"User","site_admin":false},"created_at":"2016-10-18T23:19:19Z","updated_at":"2016-10-18T23:19:19Z","body":"Good questions all around, and I don't know whether it makes sense for promotions to be quiet moves.  Sorry for dodging the negative SEE question; I'm unsure what search & evaluation changes make sense for antichess.\r\n\r\nCaptures and promotions which increase a player's overall mobility tend to be high-risk, high-reward.  It's possible to use Stockfish's `eval` command to dump the mobility score (from the current position).\r\n\r\nConversely, captures which take your opponent's most mobile ranged pieces (in the opening, bishops; in the endgame, rooks) generally make the game more difficult."}}
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