Tablebase gain for Obsidian

[Jouni]

I test benefit for 6 piece Syzygy with endgames.epd as before to speed-up test. In selftest Obsidian 15 gain after 5000 games is very small about 3 Elo. But against SF17 there is bigger gain for some reason. About 12 Elo.

Code: Select all

Score of stockfish17 vs obsidian150: 393 - 349 - 1258 [0.511]
...      stockfish17 playing White: 247 - 117 - 636  [0.565] 1000
...      stockfish17 playing Black: 146 - 232 - 622  [0.457] 1000
...      White vs Black: 479 - 263 - 1258  [0.554] 2000
Elo difference: 7.6 +/- 9.3, LOS: 94.7 %, DrawRatio: 62.9 %
2000 of 2000 games finished.

Score of stockfish17 vs obsidian150TB: 363 - 388 - 1249 [0.494]
...      stockfish17 playing White: 240 - 146 - 614  [0.547] 1000
...      stockfish17 playing Black: 123 - 242 - 635  [0.441] 1000
...      White vs Black: 482 - 269 - 1249  [0.553] 2000
Elo difference: -4.3 +/- 9.3, LOS: 18.1 %, DrawRatio: 62.5 %
2000 of 2000 games finished.