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e408fd7b10
In order to understand better the impact of various techniques used in search, Elo estimates have been run at STC for 60000 games (statistical error ~1.8 Elo), disabling each feature in turn. This should help future improvements and simplifications to pick suitable targets. The list of tests is: step 7 : http://tests.stockfishchess.org/tests/view/5abcbb4b0ebc5902926cf1ca step 8 : http://tests.stockfishchess.org/tests/view/5abcbb680ebc5902926cf1cc step 9 : http://tests.stockfishchess.org/tests/view/5abcbb850ebc5902926cf1ce step 10 : http://tests.stockfishchess.org/tests/view/5abcbbeb0ebc5902926cf1d2 step 11 : http://tests.stockfishchess.org/tests/view/5abcbbbf0ebc5902926cf1d0 step 13 : http://tests.stockfishchess.org/tests/view/5abd03680ebc5902926cf20b step 13a: http://tests.stockfishchess.org/tests/view/5abd29660ebc5902926cf22a step 13b: http://tests.stockfishchess.org/tests/view/5abd29820ebc5902926cf22c step 14 : http://tests.stockfishchess.org/tests/view/5abd03860ebc5902926cf20f step 14a: http://tests.stockfishchess.org/tests/view/5abd2b6c0ebc5902926cf230 step 14b: http://tests.stockfishchess.org/tests/view/5abd2b8d0ebc5902926cf232 step 14c: http://tests.stockfishchess.org/tests/view/5abd2bad0ebc5902926cf234 step 14d: http://tests.stockfishchess.org/tests/view/5abd2bcf0ebc5902926cf236 step 14e: http://tests.stockfishchess.org/tests/view/5abd2bf10ebc5902926cf238 This patch documents this in the code. Note that it will be a waste to recompute these estimates often, even a couple of [0,5] patches are unlikely to change them by more than the error bars. The interest of the Elo annotations in the code is not in the details, but in high- lighting trends such as razoring (2 Elo) and singular extensions (60 Elo). These estimates should be recomputed at most once a year. Closes https://github.com/official-stockfish/Stockfish/pull/1522 No functional change.