🔍 Use TT score as positional eval for pruning

[eduherminio]

Use TT score as positional eval for better pruning

Score of Lynx-experiment-tt-score-as-positional-eval-2765-win-x64 vs Lynx 2764 - main: 0 - 216 - 0  [0.000] 216
...      Lynx-experiment-tt-score-as-positional-eval-2765-win-x64 playing White: 0 - 108 - 0  [0.000] 108
...      Lynx-experiment-tt-score-as-positional-eval-2765-win-x64 playing Black: 0 - 108 - 0  [0.000] 108
...      White vs Black: 108 - 108 - 0  [0.500] 216
Elo difference: -inf +/- nan, LOS: 0.0 %, DrawRatio: 0.0 %
SPRT: llr -2.26 (-78.2%), lbound -2.25, ubound 2.89 - H0 was accepted

Make sure there's a TT hit

Score of Lynx-experiment-tt-score-as-positional-eval-2766-win-x64 vs Lynx 2764 - main: 65 - 231 - 124  [0.302] 420
...      Lynx-experiment-tt-score-as-positional-eval-2766-win-x64 playing White: 46 - 85 - 79  [0.407] 210
...      Lynx-experiment-tt-score-as-positional-eval-2766-win-x64 playing Black: 19 - 146 - 45  [0.198] 210
...      White vs Black: 192 - 104 - 124  [0.605] 420
Elo difference: -145.2 +/- 29.2, LOS: 0.0 %, DrawRatio: 29.5 %
SPRT: llr -2.25 (-78.0%), lbound -2.25, ubound 2.89 - H0 was accepted

Use raw TT score

Score of Lynx-experiment-tt-score-as-positional-eval-2768-win-x64 vs Lynx 2764 - main: 2469 - 2227 - 2829  [0.516] 7525
...      Lynx-experiment-tt-score-as-positional-eval-2768-win-x64 playing White: 1691 - 666 - 1407  [0.636] 3764
...      Lynx-experiment-tt-score-as-positional-eval-2768-win-x64 playing Black: 778 - 1561 - 1422  [0.396] 3761
...      White vs Black: 3252 - 1444 - 2829  [0.620] 7525
Elo difference: 11.2 +/- 6.2, LOS: 100.0 %, DrawRatio: 37.6 %
SPRT: llr 2.9 (100.4%), lbound -2.25, ubound 2.89 - H1 was accepted