7 piece tablebase gain for Stockfish

[Jouni]

There is a test in discord using using WDL in RAM (8.5 TB). Don't try at home . And result

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Results of nosyzygy vs syzygy (60+0.6, 1t, 64MB, UHO_Lichess_4852_v1.epd):
Elo: -1.77 +/- 1.53, nElo: -4.03 +/- 3.48
LOS: 1.17 %, DrawRatio: 62.03 %, PairsRatio: 0.95
Games: 38184, Wins: 9725, Losses: 9920, Draws: 18539, Points: 18994.5 (49.74 %)
Ptnml(0-2): [25, 3696, 11843, 3505, 23], WL/DD Ratio: 1.09
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