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passed STC
https://tests.stockfishchess.org/tests/view/5fca4c0842a050a89f02cd66
LLR: 3.00 (-2.94,2.94) {-0.25,1.25}
Total: 78152 W: 7409 L: 7171 D: 63572
Ptnml(0-2): 303, 5695, 26873, 5871, 334
passed LTC
https://tests.stockfishchess.org/tests/view/5fca6be442a050a89f02cd75
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 40240 W: 1602 L: 1441 D: 37197
Ptnml(0-2): 19, 1306, 17305, 1475, 15
Idea of this patch can be described as following : we update static history stats based on comparison of static evaluations of position before and after the move.
If move increases static evaluation it's assigned positive bonus, if it decreases static evaluation it's assigned negative bonus.
This stats are used in movepicker to sort quiet moves.
Idea is not really precise in current form, one move can have the same bonus reapplied at multiple occasions at the same node, also current bonus is based on search depth which probably should be the case for change of static evaluation - so there may be some room to refine this patch to gain more elo.
Also there can be attempts to use newly introduced stats in search itself.
bench 3845156