Store 21 bit keys in transposition table - #1127
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Use up most of remaining unused space in cluster.
One unused bit remaining per cluster. (21 * 3 = 63 bits)
STC
Elo | 1.49 +- 2.07 (95%)
SPRT | 8.0+0.08s Threads=1 Hash=16MB
LLR | 2.91 (-2.25, 2.89) [-2.75, 0.25]
Games | N: 28032 W: 7073 L: 6953 D: 14006
Penta | [90, 3206, 7309, 3316, 95]
https://recklesschess.space/test/15649/
LTC
Elo | 0.86 +- 1.67 (95%)
SPRT | 40.0+0.40s Threads=1 Hash=64MB
LLR | 2.92 (-2.25, 2.89) [-2.75, 0.25]
Games | N: 38652 W: 9589 L: 9493 D: 19570
Penta | [18, 4394, 10408, 4486, 20]
https://recklesschess.space/test/15653/
Bench: 2985186