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.