Speedup_threat_by_lesser
This patch could have been considered a non-functional speedup, but changing
the ranking of illegal moves.
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 131040 W: 34247 L: 33792 D: 63001
Ptnml(0-2): 407, 15281, 33675, 15764, 393
https://tests.stockfishchess.org/tests/live_elo/68a9a75b75da51a345a5a66d
Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 280146 W: 72055 L: 71242 D: 136849
Ptnml(0-2): 153, 30252, 78438, 31089, 141
https://tests.stockfishchess.org/tests/view/68a9f58475da51a345a5a6e0
closes https://github.com/official-stockfish/Stockfish/pull/6261
Bench: 2321931