Add IID on PV nodes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87%. Comparing base (a13aea9) to head (9e2c784).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #224 +/- ## ===================================== + Coverage 87% 87% +1% ===================================== Files 32 32 Lines 4274 4287 +13 Branches 4274 4287 +13 ===================================== + Hits 3681 3694 +13 Misses 577 577 Partials 16 16 ```

[github-actions[bot]]

Against master [hash=64; threads=1]: 🆗 Elo difference: 5.79 +/- 22.87, LOS: 69.02 %, DrawRatio: 32.33 %

[github-actions[bot]]

Against v1.5.0 [hash=64; threads=1]: 🆗 Elo difference: 13.90 +/- 22.82, LOS: 88.38 %, DrawRatio: 32.67 %

[github-actions[bot]]

Against master [hash=256; threads=4]: 🆗 Elo difference: -5.21 +/- 37.23, LOS: 39.17 %, DrawRatio: 40.50 %

[github-actions[bot]]

Against v1.5.0 [hash=256; threads=4]: 🆗 Elo difference: 3.47 +/- 38.93, LOS: 56.96 %, DrawRatio: 35.00 %