Simplify improving code

[dallinson]

Elo   | -0.42 +- 2.53 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=16MB
LLR   | 2.92 (-2.25, 2.89) [-5.00, 0.00]
Games | N: 36828 W: 9783 L: 9827 D: 17218
Penta | [1226, 4476, 7047, 4446, 1219]```

Elo | 1.15 +- 3.43 (95%)
SPRT | 40.0+0.40s Threads=1 Hash=64MB
LLR | 2.94 (-2.25, 2.89) [-5.00, 0.00]
Games | N: 16628 W: 3819 L: 3764 D: 9045
Penta | [352, 2031, 3529, 2014, 388]```
Bench: 4251753