Introduce static evaluation correction history #4950
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Adds clamping to staticEval to guard for future tweaks hitting TB range or mate range. Passed non-regression STC: https://tests.stockfishchess.org/tests/view/65903fe179aa8af82b9566fb LLR: 2.98 (-2.94,2.94) <-1.75,0.25> Total: 38656 W: 10048 L: 9830 D: 18778 Ptnml(0-2): 124, 4278, 10308, 4492, 126 Passed non-regression LTC: https://tests.stockfishchess.org/tests/view/659055d079aa8af82b95691d LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 134532 W: 33728 L: 33625 D: 67179 Ptnml(0-2): 70, 14326, 38369, 14433, 68 no functional change
Guard correction history from overflowing staticEval in the future.
Revert "Guard correction history from overflowing staticEval in the future."
Adds clamping to staticEval to guard for future tweaks hitting TB range or mate range. Passed non-regression STC: https://tests.stockfishchess.org/tests/view/65903fe179aa8af82b9566fb LLR: 2.98 (-2.94,2.94) <-1.75,0.25> Total: 38656 W: 10048 L: 9830 D: 18778 Ptnml(0-2): 124, 4278, 10308, 4492, 126 Passed non-regression LTC: https://tests.stockfishchess.org/tests/view/659055d079aa8af82b95691d LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 134532 W: 33728 L: 33625 D: 67179 Ptnml(0-2): 70, 14326, 38369, 14433, 68 no functional change
Disservin
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Guard correction history from overflowing staticEval in the future.
Disservin
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rn5f107s2
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Jan 14, 2024
Idea from Caissa (https://github.com/Witek902/Caissa) chess engine. With given pawn structure collect data with how often search result and by how much it was better / worse than static evalution of position and use it to adjust static evaluation of positions with given pawn structure. Details: 1. excludes positions with fail highs and moves producing it being a capture; 2. update value is function of not only difference between best value and static evaluation but also is multiplied by linear function of depth; 3. maximum update value is maximum value of correction history divided by 2; 4. correction history itself is divided by 32 when applied so maximum value of static evaluation adjustment is 32 internal units. Passed STC: https://tests.stockfishchess.org/tests/view/658fc7b679aa8af82b955cac LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 128672 W: 32757 L: 32299 D: 63616 Ptnml(0-2): 441, 15241, 32543, 15641, 470 Passed LTC: https://tests.stockfishchess.org/tests/view/65903f6979aa8af82b9566f1 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 97422 W: 24626 L: 24178 D: 48618 Ptnml(0-2): 41, 10837, 26527, 11245, 61 closes official-stockfish#4950 Bench: 1157852
windfishballad
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Jan 23, 2024
Idea from Caissa (https://github.com/Witek902/Caissa) chess engine. With given pawn structure collect data with how often search result and by how much it was better / worse than static evalution of position and use it to adjust static evaluation of positions with given pawn structure. Details: 1. excludes positions with fail highs and moves producing it being a capture; 2. update value is function of not only difference between best value and static evaluation but also is multiplied by linear function of depth; 3. maximum update value is maximum value of correction history divided by 2; 4. correction history itself is divided by 32 when applied so maximum value of static evaluation adjustment is 32 internal units. Passed STC: https://tests.stockfishchess.org/tests/view/658fc7b679aa8af82b955cac LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 128672 W: 32757 L: 32299 D: 63616 Ptnml(0-2): 441, 15241, 32543, 15641, 470 Passed LTC: https://tests.stockfishchess.org/tests/view/65903f6979aa8af82b9566f1 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 97422 W: 24626 L: 24178 D: 48618 Ptnml(0-2): 41, 10837, 26527, 11245, 61 closes official-stockfish#4950 Bench: 1157852
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Idea from Caissa chess engine.
With given pawn structure collect data with how often search result and by how much it was better / worse than static evalution of position and use it to adjust static evaluation of positions with given pawn structure.
Details:
Passed STC:
https://tests.stockfishchess.org/tests/view/658fc7b679aa8af82b955cac
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 128672 W: 32757 L: 32299 D: 63616
Ptnml(0-2): 441, 15241, 32543, 15641, 470
Passed LTC:
https://tests.stockfishchess.org/tests/view/65903f6979aa8af82b9566f1
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 97422 W: 24626 L: 24178 D: 48618
Ptnml(0-2): 41, 10837, 26527, 11245, 61
bench 1403669